Patent Publication Number: US-11647319-B2

Title: Headphone eartips with internal support components for outer eartip bodies

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/983,736, filed on Aug. 3, 2020, which is a continuation of U.S. patent application Ser. No. 16/780,881, filed Feb. 3, 2020, which is a continuation Ser. No. 16/148,552, filed Oct. 1, 2018, which is a continuation of U.S. patent application Ser. No. 15/253,794, filed Aug. 31, 2016, now U.S. Pat. No. 10,129,625, issued on Nov. 13, 2018, which claims the benefit of U.S. Patent Application No. 62/234,864, filed Sep. 30, 2015. Each of the Ser. Nos. 16/983,736; 16/780,881; 16/148,552; 15/253,794; and 62/234,864 applications listed above are incorporated by reference herein in their entirety. 
    
    
     FIELD 
     This disclosure relates to headphone eartips with internal support components and methods for making the same. 
     BACKGROUND 
     Whether listening to sound from a portable media player while traveling or from a theater system while at home, consumers often use headphones rather than open air loudspeakers to do so. Some headphones include at least one earpiece with a driver for emitting sound waves and an eartip communicatively coupled to the driver and insertable into a user&#39;s ear canal for directing the sound waves from the driver and through the user&#39;s ear canal towards the user&#39;s eardrum. When such headphones are worn by a user, the eartip may deform in order to fit inside the user&#39;s ear canal. However, such eartips are often unable to obtain or maintain a deformed shape that substantially matches the unique shape of a particular user&#39;s ear canal in order to create an efficient acoustic seal. Accordingly, alternative eartips for earpieces are needed. 
     SUMMARY OF THE DISCLOSURE 
     This document describes headphone eartips with internal support components and methods for making the same. 
     As an example, an eartip that is operative to be at least partially positioned within an ear canal may include an inner eartip body including an inner eartip front end with an inner eartip front opening through the inner eartip front end, an inner eartip back end with an inner eartip back opening through the inner eartip back end, an inner eartip interior surface extending between the inner eartip front opening and the inner eartip back opening for defining an inner eartip space, and an inner eartip exterior surface extending about the inner eartip interior surface between the inner eartip front end and the inner eartip back end. The eartip may also include an outer eartip body that is operative to deform when the eartip is at least partially positioned within the ear canal. The outer eartip body may include an outer eartip front end with an outer eartip front opening through the outer eartip front end, wherein the outer eartip front end is coupled to the inner eartip front end for at least partially aligning the inner eartip front opening and the outer eartip front opening, an outer eartip back end with an outer eartip back opening through the outer eartip back end, an outer eartip interior surface extending between the outer eartip front opening and the outer eartip back opening for defining an outer eartip space, and an outer eartip exterior surface extending about the outer eartip interior surface between the outer eartip front end and the outer eartip back end. The eartip may also include an internal support subsystem including a support body extending between a first support body end and a second support body end. The first support body end is coupled to one of the inner eartip exterior surface and the outer eartip interior surface. The internal support subsystem further includes a flap that extends from the second support body end. A flap surface portion of the flap interfaces with an interface surface portion of the other one of the inner eartip exterior surface and the outer eartip interior surface. A contour of the flap surface portion matches a contour of the interface surface portion. 
     As another example, an eartip for use with a sound emitting component may include an outer eartip body defining an outer eartip space and operative to be at least partially positioned within an ear canal, an inner eartip body coupled to the outer eartip body and defining an inner eartip space at least partially within the outer eartip space for passing sound from the sound emitting component, and an internal support subsystem including a support body extending between a first support body end that is coupled to the inner eartip body and a second support body end that interfaces with an interface portion of the outer eartip body that defines a spiral with respect to a longitudinal axis of the inner eartip space. 
     As yet another example, an eartip for use with a sound emitting component may include an outer eartip body defining an outer eartip space and operative to be at least partially positioned within an ear canal, and an internal support subsystem including a support body coupled to the outer eartip body. The support body and a portion of the outer eartip body together define a fluid enclosure space within the outer eartip space. A portion of the support body defines at least a portion of an inner eartip space within the outer eartip space. The inner eartip space is operative to at least one of at least partially retain at least a portion of the sound emitting component and provide at least a portion of a path for passing sound from the sound emitting component. 
     As yet another example, an earpiece that is operative to be at least partially positioned within an ear canal may include an eartip subassembly including an inner eartip body, an outer eartip body that is operative to deform when the earpiece is at least partially positioned within the ear canal, and an internal support subsystem. The inner eartip body may include an inner eartip front end with an inner eartip front opening through the inner eartip front end, an inner eartip back end with an inner eartip back opening through the inner eartip back end, an inner eartip interior surface extending between the inner eartip front opening and the inner eartip back opening for defining an inner eartip space, and an inner eartip exterior surface extending about the inner eartip interior surface between the inner eartip front end and the inner eartip back end. The outer eartip body may include an outer eartip front end with an outer eartip front opening through the outer eartip front end, wherein the outer eartip front end is coupled to the inner eartip front end for at least partially aligning the inner eartip front opening and the outer eartip front opening, an outer eartip back end with an outer eartip back opening through the outer eartip back end, an outer eartip interior surface extending between the outer eartip front opening and the outer eartip back opening for defining an outer eartip space, and an outer eartip exterior surface extending about the outer eartip interior surface between the outer eartip front end and the outer eartip back end. The internal support subsystem may include an internal support component, wherein the internal support component contacts at least a portion of the inner eartip body, wherein the internal support component extends at least partially about the inner eartip space and along at least a portion of the length of the inner eartip space, and wherein the internal support component is operative to ensure that a cross-sectional area of the inner eartip space exists along the at least a portion of the length of the inner eartip space when the earpiece is at least partially positioned within the ear canal. 
     As yet another example, an earpiece that is operative to be at least partially positioned within an ear canal may include a transducer subassembly, an eartip subassembly including an outer eartip body defining an outer eartip space and operative to be at least partially positioned within the ear canal and an inner eartip body coupled to the outer eartip body and defining an inner eartip space at least partially within the outer eartip space, and an internal support subsystem including an internal support component, wherein the internal support component at least partially couples the transducer subassembly to the eartip subassembly such that the transducer subassembly is operative to emit sound into the inner eartip space, and wherein the internal support component is operative to ensure that a cross-sectional area of the inner eartip space exists along at least a portion of the length of the inner eartip space when the earpiece is at least partially positioned within the ear canal. 
     As yet another example, an earpiece that is operative to be at least partially positioned within an ear canal may include a transducer subassembly, an eartip subassembly including an outer eartip body defining an outer eartip space and operative to be at least partially positioned within the ear canal and an inner eartip body coupled to the outer eartip body and defining an inner eartip space at least partially within the outer eartip space, and an internal support subsystem comprising an internal support component, wherein the internal support component at least partially couples the transducer subassembly to the eartip subassembly such that the transducer subassembly is operative to emit sound into the inner eartip space, and wherein a portion of the internal support component extends within the inner eartip body at least partially about the inner eartip space. 
     This Summary is provided merely to summarize some example embodiments, so as to provide a basic understanding of some aspects of the subject matter described in this document. Accordingly, it will be appreciated that the features described in this Summary are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Unless otherwise stated, features described in the context of one example may be combined or used with features described in the context of one or more other examples. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The discussion below makes reference to the following drawings, in which like reference characters may refer to like parts throughout, and in which: 
         FIG.  1    is a perspective view of an illustrative headphone assembly that includes two earpieces with internal support components, where one of the two earpieces is shown fully assembled and the other of the two earpieces is shown exploded; 
         FIG.  2    is a perspective view of a portion of one of the earpieces of  FIG.  1    as manufactured prior to inversion; 
         FIG.  3    is a cross-sectional view of the fully assembled earpiece of  FIGS.  1  and  2   ; 
         FIG.  4    is a cross-sectional view of a portion of the earpiece of  FIGS.  1 - 3    as manufactured prior to inversion; 
         FIG.  5    is a cross-sectional view of another illustrative earpiece with internal support components fully assembled; 
         FIG.  6    is a perspective view of the earpiece of  FIG.  5    but exploded; 
         FIG.  7    is a top elevational view of an illustrative eartip subassembly with internal support components; 
         FIG.  8    is a cross-sectional view of the eartip subassembly of  FIG.  7   , taken from line VIII-VIII of  FIG.  7   ; 
         FIG.  9    is a cross-sectional view of the eartip subassembly of  FIGS.  7  and  8   , taken from line IX-IX of  FIG.  8   ; 
         FIG.  10    is a cross-sectional view of the eartip subassembly of  FIGS.  7 - 9   , taken from line X-X of  FIG.  8   ; 
         FIG.  11    is a cross-sectional view of the eartip subassembly of  FIGS.  7 - 10   , taken from line XI-XI of  FIG.  8   ; 
         FIG.  12    is a top elevational view of another illustrative eartip subassembly with internal support components; 
         FIG.  13    is a cross-sectional view of the eartip subassembly of  FIG.  12   , taken from line XIII-XIII of  FIG.  12   ; 
         FIG.  14    is a cross-sectional view of the eartip subassembly of  FIGS.  12  and  13   , taken from line XIV-XIV of  FIG.  13   ; 
         FIG.  15    is a cross-sectional view of the eartip subassembly of  FIGS.  12 - 14   , taken from line XV-XV of  FIG.  13   ; 
         FIG.  16    is a cross-sectional view of the eartip subassembly of  FIGS.  12 - 15   , taken from line XVI-XVI of  FIG.  13   ; 
         FIG.  17    is a top elevational view of yet another illustrative earpiece with internal support components; 
         FIG.  18    is a cross-sectional view of the earpiece of  FIG.  17   , taken from line XVIII-XVIII of  FIG.  17   ; 
         FIG.  19    is a bottom elevational view of the earpiece of  FIGS.  17  and  18   , taken from line XIX-XIX of  FIG.  18   ; 
         FIG.  20    is a top elevational view of the earpiece of  FIGS.  17 - 19   , taken from line XX-XX of  FIG.  18   , but with only a back end of an outer eartip portion shown; 
         FIG.  21    is a top elevational view of yet another illustrative earpiece with internal support components; 
         FIG.  22    is a cross-sectional view of the earpiece of  FIG.  21   , taken from line XXII-XXII of  FIG.  21   ; 
         FIG.  23    is a cross-sectional view of the earpiece of  FIGS.  21  and  22   , taken from line XXIII-XXIII of  FIG.  22   ; 
         FIG.  24    is a cross-sectional view of the earpiece of  FIGS.  21 - 23   , taken from line XXIV-XXIV of  FIG.  21   ; 
         FIG.  25    is a cross-sectional view of the earpiece of  FIGS.  21 - 24   , taken from line XXV-XXV of  FIG.  24   ; 
         FIG.  26    is a top elevational view of yet another illustrative eartip subassembly with internal support components; 
         FIG.  27    is a cross-sectional view of the eartip subassembly of  FIG.  26   , taken from line XXVII-XXVII of  FIG.  26   ; 
         FIG.  28    is a cross-sectional view of the eartip subassembly of  FIGS.  26  and  27   , taken from line XXVIII-XXVIII of  FIG.  27   ; 
         FIG.  29    is a top elevational view of yet another illustrative eartip subassembly with internal support components; 
         FIG.  30    is a cross-sectional view of the eartip subassembly of  FIG.  29   , taken from line XXX-XXX of  FIG.  29   ; 
         FIG.  31    is a cross-sectional view of the eartip subassembly of  FIGS.  29  and  30   , taken from line XXXI-XXXI of  FIG.  30   ; 
         FIG.  32    is a top elevational view of yet another illustrative earpiece with internal support components; 
         FIG.  33    is a cross-sectional view of the earpiece of  FIG.  32   , taken from line XXXIII-XXXIII of  FIG.  32   ; and 
         FIG.  34    is a cross-sectional view of the earpiece of  FIGS.  32  and  33   , taken from line XXXIV-XXXIV of  FIG.  33   . 
     
    
    
     DETAILED DESCRIPTION 
     Headphone eartips with internal support components and methods for making the same are provided and described with reference to  FIGS.  1 - 34   . 
     An earpiece of a headphone assembly may include a transducer subassembly that may be operative to emit sound and an eartip subassembly that may be operative to deform in order to fit inside a user&#39;s ear canal. The eartip subassembly may include an outer eartip body that may define an exterior surface of the earpiece that may conform to the geometry of a user&#39;s ear canal for creating a consistent and comfortable acoustic seal between the earpiece and the user. The eartip subassembly may also include an inner eartip body coupled to the transducer subassembly and to the outer eartip body. The inner eartip body may define an inner eartip space positioned at least partially within an outer eartip space defined by the outer eartip body, where the inner eartip space may be operative to pass the sound emitted by the transducer subassembly through the outer eartip space and into the user&#39;s ear canal. Independent of any geometry or material variability of the inner eartip body and/or of the outer eartip body of an eartip subassembly, one or more internal support subsystems may be provided to vary the effective rigidity of an eartip body of the eartip subassembly for affecting the ability of the eartip subassembly to conform to various ear canal geometries. Different support components of one or more internal support subsystems may be positioned and configured to provide specific amounts and types of additional rigidity at specific portions of the exterior surface of the outer eartip body that may be expected to interface with specific portions of a user&#39;s ear canal geometry when the eartip subassembly is positioned within the user&#39;s ear canal (e.g., such that the eartip subassembly may be operative to conform to different bumps along the surfaces of the ear canal while maintaining an acoustic seal and while providing comfort to the user). Additionally or alternatively, at least one support component of an internal support subsystem may be positioned and configured to provide specific amounts and types of additional rigidity at specific portions of the inner eartip body defining the inner eartip space (e.g., such that the inner eartip space may be operative to ensure an effective sound path while also at least partially conforming to various ear canal geometries). 
     
       FIGS.  1 - 4   
     
     For example, as shown in  FIG.  1   , a headphone assembly  100  may provide any suitable headphones that may include one earpiece or a pair of earpieces, such as a first earpiece assembly  110  for use with a user&#39;s left ear and a second earpiece assembly  120  for use with a user&#39;s right ear. When a user wears headphone assembly  100  by inserting at least a portion of an eartip of each earpiece in a respective ear canal, that portion of the eartip may be operative to deform so as to fit within the unique shape of the particular user&#39;s ear canal and also to press outwardly against at least a portion of the user&#39;s ear canal for creating an efficient acoustic seal that may be suitable to hold the eartip in the ear canal such that sound may be provided from the earpiece and through the ear canal towards the user&#39;s eardrum. Such an earpiece may be referred to as a canalphone or an in-ear-monitor (“IEM”), or sometimes as an earbud (e.g., an in the canal earbud or an occluding earbud). 
     As shown in  FIG.  1    as well as in  FIGS.  2 - 4   , earpiece  120  may include a housing subassembly  130 , a sound emitting subassembly  140 , and an eartip subassembly  150 . Housing subassembly  130  may be operative to house at least a portion of sound emitting subassembly  140  and/or to communicatively couple sound emitting subassembly  140  to an inner eartip space  165  of eartip subassembly  150 . Sound emitting subassembly  140  may be operative to emit sound S for passage through inner eartip space  165  of eartip subassembly  150 . Eartip subassembly  150  may be operative to provide a comfortable fit for earpiece  120  at least partially within an ear canal of a user and/or to form an acoustic seal between earpiece  120  and the ear canal and/or to pass sound S through the ear canal via inner eartip space  165  when headphone assembly  100  is worn by the user. It is to be understood that while  FIGS.  2 - 4    may illustrate only earpiece  120  of the pair of earpieces  110  and  120  of headphone assembly  100 , one, some, or all of the features of earpiece  120 , alone and/or with respect to an ear of a user, may also apply to earpiece  110 , alone and/or with respect to another ear of a user. 
     Housing subassembly  130  may include a housing portion  132 , which may at least partially define a housing space  134 . Housing portion  132  may provide at least a portion of an enclosure that may be operative to protect or hold at least a portion of sound emitting subassembly  140  in housing space  134 . At least a portion of housing subassembly  130  (e.g., housing portion  132 ) and/or at least a portion of sound emitting subassembly  140  may be coupled to eartip subassembly  150  for enabling sound emitting subassembly  140  to be acoustically communicatively coupled with inner eartip space  165  of eartip subassembly  150 . For example, housing portion  132  may include a housing opening that may be operative to enable a portion of sound emitting subassembly  140  that emits sound S to extend out from housing space  134  and into inner eartip space  16 . 5  of eartip subassembly  150  such that sound emitting subassembly  140  may emit sound S directly into inner eartip space  165  when eartip subassembly  150  is coupled to housing subassembly  130  and/or sound emitting subassembly  140 . Alternatively, as shown in  FIG.  3   , housing portion  132  may include a housing opening  135  that may be operative to enable sound S emitted from sound emitting subassembly  140  to exit housing space  134  through housing opening  135  and into inner eartip space  165  of eartip subassembly  150  when eartip subassembly  150  is coupled to housing subassembly  130  and/or sound emitting subassembly  140 . In some embodiments, housing subassembly  130  may also include a filter  136  (e.g., spanning housing opening  135  (e.g., as shown in  FIG.  3   ) and/or spanning a cross-section of eartip space  165  in front of sound emitting subassembly  140 ), where filter  136  may be operative to enable sound S to pass through filter  136  from sound emitting subassembly  140  and into eartip space  165  while preventing any harmful objects (e.g., wax or debris) from passing through filter  136  from eartip space  165  and into sound emitting subassembly  140 , thereby protecting at least a portion of sound emitting subassembly  140 . Housing subassembly  130 , such as housing portion  132 , may be constructed from any suitable material, including, but not limited to, metal, ceramic, plastic, and any combination thereof. 
     Sound emitting subassembly  140  may be provided at least partially within housing subassembly  130  and may be operative to emit sound S into inner eartip space  165  and towards an eardrum of a user when assembly  100  is being worn by the user. For example, in some embodiments, as shown in  FIG.  2   , sound emitting subassembly  140  may include at least one driver  142  communicatively coupled to a sound source  144 . Driver  142  may be any suitable acoustic element or component (e.g., one or more electroacoustic transducers) that may be operative to convert an electrical audio signal that may be received from sound source  144  into a corresponding sound S (e.g., vibrations) for receipt by an eardrum of a user. Sound source  144  may be any suitable type of and/or portion of audio playback circuitry (e.g., a processing component, a memory component, a communications component, and/or the like, such as may be provided by a portable media player) that may be operative to output such an electrical audio signal for use by at least one driver  142 . Housing subassembly  130  and sound emitting subassembly  140  may be individually and/or collectively referred to herein as a driver subassembly or a transducer subassembly. 
     Eartip subassembly  150  may be coupled to any suitable portion of housing subassembly  130  and/or sound emitting subassembly  140  in any suitable way such that sound S may be effectively emitted into a portion of eartip space  165  of eartip subassembly  150 , and then passed through and out of eartip space  165  towards an eardrum of a user when eartip subassembly  150  is at least partially retained within an ear canal of the user. Eartip subassembly  150  may include an inner eartip portion  160  and an outer eartip portion  170  coupled to inner eartip portion  160 . Inner eartip portion  160  may include an inner eartip body  164  that may extend between an inner eartip back end  162  and an inner eartip front end  168 . For example, as shown, both an inner eartip interior surface  161  of inner eartip body  164  and an opposite inner eartip exterior surface  169  of inner eartip body  164  may extend between inner eartip back end  162  and inner eartip front end  168 . Inner eartip space  165  may be defined by inner eartip interior surface  161  and may extend between an inner eartip back opening  163  that may be provided through inner eartip back end  162  and an inner eartip front opening  167  that may be provided through inner eartip front end  168 . Inner eartip space  165  and, thus, inner eartip interior surface  161  may be any suitable shape in its default configuration, such as a cylinder, a cube, a rectangular cuboid, or any irregular shape. The cross-sectional geometry of inner eartip space  165  and, thus, inner eartip interior surface  161  may be constant or may vary in any suitable manner along the length of inner eartip body  164  (e.g., along a Z-axis between ends  162  and  168 ). Similarly, inner eartip exterior surface  169  of inner eartip body  164  may be any suitable shape in its default configuration, such as a cylinder, a cube, a rectangular cuboid, or any irregular shape. The cross-sectional geometry of inner eartip exterior surface  169  may be constant or may vary in any suitable manner along the length of inner eartip body  164  (e.g., along a Z-axis between ends  162  and  168 ). 
     Outer eartip portion  170  may include an outer eartip body  174  that may extend between an outer eartip back end  172  and an outer eartip front end  178 . For example, as shown, both an outer eartip interior surface  171  of outer eartip body  174  and an opposite outer eartip exterior surface  179  of outer eartip body  174  may extend between outer eartip back end  172  and outer eartip front end  178 . As shown in  FIGS.  1  and  3   , for example, an outer eartip space  175  may be defined by outer eartip interior surface  171  (e.g., one portion of space  375  may be defined between outer eartip interior surface  171  and inner eartip exterior surface  169  when at least a portion of inner eartip body  164  is positioned between portions of outer eartip interior surface  171 , and another portion of space  175  may be occupied by inner eartip body  164  and inner eartip space  165 ) and may extend between outer eartip back end  172  and outer eartip front end  178 . Moreover, as also shown in  FIGS.  1  and  3   , an outer eartip back opening  173  may be provided through outer eartip back end  172  and an outer eartip front opening  177  may be provided through outer eartip front end  178 . 
     Outer eartip portion  170  may be coupled to inner eartip portion  160  at an eartip portion interface  155 . For example, as shown, outer eartip front end  178  of outer eartip portion  170  may be coupled to inner eartip front end  168  of inner eartip portion  160 , whereby inner eartip front opening  167  that may be provided through inner eartip front end  168  may be coupled to outer eartip front opening  177  that may be provided through outer eartip front end  178  (e.g., at least a portion of opening  167  and at least a portion of opening  177  may be combined to provide a path for sound S). Outer eartip portion  170  may be coupled to inner eartip portion  160  at eartip portion interface  155  using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable gasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, outer eartip portion  170  may be molded to or otherwise integrated with inner eartip portion  160  at eartip portion interface  155  using any suitable process (e.g., in a single or double-shot molding process). As shown in a functional configuration of  FIGS.  1  and  3   , outer eartip body  174  may be configured with respect to inner eartip body  164  such that outer eartip interior surface  171  may extend from interface  155  both about and along inner eartip exterior surface  169 . Outer eartip exterior surface  179  of outer eartip body  174  may have any suitable shape, including, for example, a substantially curved or domed shape (e.g., with a variable circular or elliptical cross-sectional area transverse or perpendicular to a longitudinal axis of inner eartip space  165  of inner eartip body  164  along which sound S may travel (e.g., a Z-axis)). The shape and length of outer eartip exterior surface  179  may be selected based on the size of the ear canal of an intended user or of an average user, such that outer eartip exterior surface  179  may be operative to deflect to receive the geometry of the user&#39;s ear canal, thus providing an interference-type fit, but may be operative not deflect so much as to create significant pressure against the user&#39;s ear. For example, at least a portion of outer eartip exterior surface  179  may define a concave structure such that a cross-sectional area defined by outer eartip exterior surface  179  at outer eartip front end  178  and/or at outer eartip back end  172  may be less than a cross-sectional area defined by outer eartip exterior surface  179  between outer eartip front end  178  and outer eartip back end  172 . At least a substantial portion of outer eartip exterior surface  179  may be substantially smooth to ensure a comfortable fit against a surface of a user&#39;s ear canal when eartip subassembly  150  is positioned within the user&#39;s ear canal. 
     Eartip subassembly  150  may be constructed from any suitable material. In some embodiments, inner eartip portion  160  and outer eartip portion  170  may be constructed from the same material (e.g., in a single-shot molding process) or from different materials (e.g., in a double-shot molding process) that may provide different characteristics between the two eartip portions (e.g., different colors for aesthetic reasons and/or different structural characteristics (e.g., rigidities) for functional purposes). Any suitable material may be used for inner eartip portion  160  and/or outer eartip portion  170 , including, for example, silicone, rubber, latex, foam, or any other suitable material. In some embodiments, eartip assembly  150  (e.g., at least outer eartip portion  170  may be manufactured from an elastic material (e.g., an elastomer or other composite material) that may be operative to deform when eartip assembly  150  is at least partially positioned within a user&#39;s ear canal, such that at least a portion of outer eartip portion  170  may be compressed and may then expand to press against a user&#39;s ear canal to create a seal and/or to retain at least a portion of eartip assembly  150  within the user&#39;s ear canal. In some embodiments, the material used for at least a portion of eartip assembly  150  may be selected based on its acoustic properties (e.g., based on the material&#39;s acoustical absorption). 
     Eartip subassembly  150  may be manufactured using any suitable approach. In some embodiments, eartip subassembly  150  may be manufactured using a molding process. To create eartip subassembly  150 , material may be injected into a mold along an outermost portion or any other suitable portion of eartip subassembly  1 . 50 . For example, material may be injected into a mold at an area  176  of eartip subassembly  150  (e.g., a single line going around the periphery of eartip subassembly  150 , such as along an equator of outer eartip interior surface  171  of outer eartip body  174  when outer eartip portion  170  is in an uninverted configuration of  FIGS.  2  and  4   ). When such a molding process is finished, whereby the material has been suitably inserted in the mold, a parting line may remain at such an area  176 . Such a parting line (not shown) may be visible to a user&#39;s eye and/or may create a ridge or bump that may be detectable by a user&#39;s touch. To hide such a parting line at such an area  176  from the user and to make eartip subassembly  150  more comfortable for use when inserted in a user&#39;s ear canal, at least a portion of eartip subassembly  150  may be inverted. For example, as shown, outer eartip portion  170  may be inverted with respect to inner eartip portion  160  from the uninverted configuration of  FIGS.  2  and  4    to an inverted configuration of  FIGS.  1  and  3   , such that outer eartip interior surface  171  may face and surround at least a portion of inner eartip exterior surface  169  (e.g., such that outer eartip back end  172  may be closer to inner eartip back end  162  in the inverted configuration than it was in the uninverted configuration (e.g., such that outer eartip back end  172  may be closer to inner eartip back end  162  than to interface  155  in the inverted configuration)). In such an embodiment, once outer eartip portion  170  has been inverted, a parting line at area  176  may be facing inner eartip portion  160  and, thus, away from the user&#39;s ear canal, such that outer eartip exterior surface  179  of outer eartip portion  170  (e.g., the inner surface pre-inversion in  FIGS.  2  and  4   ) that may contact a user&#39;s ear canal during use may be substantially smooth and not include such a parting line. 
     Using such an inversion approach, additional features may be formed on outer eartip interior surface  171  and/or on inner eartip exterior surface  169  prior to inversion that may otherwise be more difficult or impossible to form post-inversion (e.g., one or more support components of one or more eartip subassemblies of  FIGS.  7 - 34   ). In some embodiments, eartip subassembly  150 , when manufactured in an inverted form (e.g., as in  FIGS.  2  and  4   ) and subsequently inverted for use, may be shaped differently than when manufactured directly in its final functional shape (e.g., as in  FIGS.  1  and  3   ). In particular, it may not be possible to create a mold based on the inverted shape of an eartip subassembly manufactured directly in the final shape due to stresses inherent to the material when it is shaped. 
     As mentioned, eartip subassembly  150  may be coupled to any suitable portion of housing subassembly  130  and/or sound emitting subassembly  140  in any suitable way such that sound S may be effectively emitted into a portion of eartip space  165  of eartip subassembly  150 , and then passed through and out of eartip space  165  via inner eartip front opening  167  towards an eardrum of a user when eartip subassembly  150  is at least partially retained within an ear canal of the user. For example, as shown in  FIG.  3   , a portion of a housing front end  138  of housing portion  132  of housing subassembly  130  may abut and/or be coupled to inner eartip back end  162  of inner eartip portion  160  about inner eartip back opening  163  such that another portion of housing subassembly  130  and/or at least a portion of sound emitting subassembly  140  may cover at least a portion of inner eartip back opening  163 . In some embodiments, housing front end  138  may be coupled to inner eartip back end  162  (e.g., using any suitable adhesive(s) or mechanical feature(s) or the like) for coupling housing subassembly  130  and sound emitting subassembly  140  to eartip subassembly  150 . Additionally or alternatively, as also shown in  FIG.  3   , a leading housing portion  139  of housing portion  132  of housing subassembly  130  (e.g., a nozzle portion of housing portion  132  that may extend in the +Z direction beyond housing front end  138 , which may include opening  135  and/or filter  136 ) and/or a leading sound emitting portion  149  of sound emitting subassembly  140  (e.g., a nozzle portion of sound emitting subassembly  140 , which may include at least a portion of at least one driver  142 ) may extend beyond inner eartip back opening  163  (e.g., by an insertion distance I) so as to be positioned within inner eartip space  16 . 5 . In some embodiments, leading housing portion  139  and/or leading sound emitting portion  149  may be coupled to inner eartip interior surface  161  of inner eartip body  164  (e.g., using any suitable adhesive(s) or mechanical feature(s) or interference fit(s) or the like) for coupling housing subassembly  130  and sound emitting subassembly  140  to eartip subassembly  150 . Therefore, inner eartip portion  160  may be coupled to any suitable portion of housing subassembly  130  and/or sound emitting subassembly  140  using geometric or structural elements (e.g., inner eartip body  164  may be coupled to housing front end  138  and/or to leading housing portion  139  and/or to leading sound emitting portion  149  using an adhesive, tape, heat staking or heat treatment, an interference fit, a gasket, a mechanical fastener, combinations thereof, or any other suitable approach) and/or inner eartip portion  160  may be manufactured as a part of any suitable portion of housing subassembly  130  and/or sound emitting subassembly  140  (e.g., inner eartip portion  160  may be molded into housing subassembly  130  (e.g., in a double-shot molding process)). 
     In its default configuration (e.g., prior to any deformation of eartip subassembly  150  for use in a user&#39;s ear), inner eartip space  165  may be any suitable shape and its cross-sectional geometry may be constant or may vary in any suitable manner along the length of inner eartip body  164 . However, when eartip subassembly  150  is positioned within a user&#39;s ear canal for use in delivering sound S from sound emitting subassembly  140  to the user&#39;s eardrum, inner eartip portion  160  may be configured to provide at least a minimum cross-sectional geometry for inner eartip space  165  at every point along the length of inner eartip body  164  in order to prevent the sound path for sound S (e.g., through and out from inner eartip space  165  via inner eartip front opening  167 ) from being pinched, kinked, or otherwise misshapen so as to be ineffective when eartip subassembly  150  (e.g., outer eartip portion  170 ) may conform to the bends and shapes of the user&#39;s ear canal. In some embodiments, at least a portion of inner eartip body  164  may be formed by a material or combination of materials that may be rigid enough to prevent the collapse or a change in the shape of inner eartip space  165  that would negatively affect the quality of sound S being passed through inner eartip space  165 . Additionally or alternatively, an inner eartip internal support subsystem  166  may be provided for increasing the rigidity of inner eartip portion  160 . For example, as shown in  FIGS.  3  and  4   , inner eartip internal support subsystem  166  of earpiece  120  may include one or more rigid or expandable components, such as five inner eartip internal support components  166   a - 166   e , each of which may be positioned within a portion of inner eartip body  164  and at least partially about a portion of inner eartip space  165 . Each one of support components  166   a - 166   e  may be operative to provide cross-sectional rigidity (e.g., circumferential stiffness) to inner eartip body  164  about a respective portion of inner eartip space  165  while still enabling outer eartip portion  170  and, perhaps, even portions of inner eartip body  164  extending between two support components of inner eartip internal support subsystem  166 , to conform to the bends and shapes of the user&#39;s ear canal when eartip subassembly  150  is positioned therein (e.g., inner eartip body  164  may be enabled to bend from a default configuration in which two particular inner eartip internal support components  166   c  and  166   d  within inner eartip body  164  may lie parallel to one another (e.g., in parallel X-Y planes and/or such that components  166   c  and  166   d  may extend about the same axis) to a deformed configuration in which inner eartip internal support components  166   c  and  166   d  within inner eartip body  164  may not be parallel to one another (e.g., in intersecting X-Y planes and/or such that components  166   c  and  166   d  may extend about different axes)). As shown, each one of inner eartip internal support components  166   a - 166   d  may extend entirely about a respective portion of inner eartip space  165  (e.g., as a complete ring). However, in some embodiments, at least one of inner eartip internal support component (e.g., inner eartip internal support component  166   e  may instead only extend at least partially about a respective portion of inner eartip space  165  (e.g., 75% or 95% of the way about inner eartip space  165 ) and include a gap  166   eg , while still ensuring at least a minimum cross-sectional geometry for inner eartip space  165 . At least a portion of an inner eartip internal support component of inner eartip internal support subsystem  166  may be contacting inner eartip body  164  in any suitable manner. In some embodiments, at least one inner eartip internal support component (e.g., inner eartip internal support component  166   a ) may be provided about and against exterior surface  169  of inner eartip body  164 . In some embodiments, at least one inner eartip internal support component (e.g., inner eartip internal support component  166   b ) may be provided within space  165  against interior surface  161  of inner eartip body  164 . Alternatively, at least one inner eartip internal support component (e.g., inner eartip internal support components  166   c - 166   e ) may be provided at least partially or completely within inner eartip body  164 . 
     Each support component of inner eartip internal support subsystem  166  may be spaced apart from one another along the length of inner eartip body  164  (e.g., along the Z-axis) in any suitable fashion. For example, each pair of consecutively positioned inner eartip internal support components may be spaced equidistant from one another along the length of inner eartip body  164  (e.g., spacing distance  166   abs  between support components  166   a  and  166   b  may be the same as spacing distance  166   bcs  between support components  166   b  and  166   c  and the same as spacing distance  166   cds  between support components  166   c  and  166   d , which may provide a consistent rigidity to inner eartip body  164  between support components  166   a  and  166   d  (e.g., at least when the material rigidity of each one of support components  166   a - 166   d  is the same and when the rigidity of the material of body  164  is the same between components  166   a  and  166   d )). Alternatively, the spacing between different pairs of consecutively positioned inner eartip internal support components may vary along the length of inner eartip body  164  (e.g., spacing distance I  66   abs  may be shorter than spacing distance  166   bcs , and spacing distance  166   bcs  may be shorter than spacing distance  166   cds , which may provide more rigidity to inner eartip body  164  between support components  166   a  and  166   b  than between support components  166   c  and  166   d  (e.g., at least when the material rigidity of each one of support components  166   a - 166   d  is the same and when the rigidity of the material of body  164  is the same between components  166   a  and  166   d )). 
     The geometry of each support component of inner eartip internal support subsystem  166  may vary in any suitable fashion. For example, different ones of inner eartip internal support components  166   a - 166   e  may have the same thickness or different thicknesses (e.g., thickness  166   at  of support component  166   a  may be the same as or different than thickness  166   bt  of support component  166   b ). Additionally or alternatively, different ones of inner eartip internal support components  166   a - 166   e  may have the same cross-sectional area or different cross-sectional areas (e.g., minimum cross-sectional dimension  166   dx  of support component  166   d  may be the same as or different than minimum cross-sectional dimension  166   ex  of support component  166   e  (e.g., where such a minimum cross-sectional dimension may be defined as the minimum distance at which two portions of a support component on opposites sides of inner eartip space  165  within any particular cross-sectional area of that support component may be separated, which may at least partially dictate the minimum cross-sectional area of inner eartip space  165  at that support component)). 
     The rigidity (e.g., stiffness or flexibility) of each support component of inner eartip internal support subsystem  166  may vary in any suitable fashion. For example, different ones of inner eartip internal support components  166   a - 166   e  may have the same rigidity or different rigidities. In some embodiments, each one of support components  166   a - 166   e  may have the same rigidity for imparting the same internal support to its respective location within inner eartip body  164  (e.g., maximum rigidity, such that the default configuration of each support component (e.g., as shown in  FIG.  4   ) may be maintained throughout any use of eartip subassembly  150  despite any deformation pressures applied thereto). Alternatively, one support component may have a different rigidity than another support component for varying the internal support provided by inner eartip internal support subsystem  166  from one support component to the other (e.g., the rigidity of support component  166   a  may be more than the rigidity of support component  166   b  and the rigidity of support component  166   b  may be more than the rigidity of support component  166   c  and the rigidity of support component  166   c  may be more than the rigidity of support component  166   d  and the rigidity of support component  166   d  may be more than the rigidity of support component  166   e , which may provide more rigidity to inner eartip body  164  at support component  166   a  than at support component  166   e  (e.g., at least when the rigidity of the material of body  164  is the same between components  166   a  and  166   e )). For example, the geometries of support components  166   d  and  166   e  may be the same such that minimum cross-sectional dimension  166   dx  of support component  166   d  in its default configuration may be the same as minimum cross-sectional dimension  166   ex  of support component  166   e  in its default configuration, but the rigidities of support components  166   d  and  166   e  may be different such that a high rigidity of support component  166   d  may prevent the magnitude of minimum cross-sectional dimension  166   dx  from changing due any external forces while a lower rigidity of support component  166   e  may enable the magnitude of minimum cross-sectional dimension  166   de  to increase due to certain external forces. For example, a flexibility of support component  166   e  may enable the magnitude of minimum cross-sectional dimension  166   ex  to expand from a first value when support component  166   e  is in a default configuration of  FIG.  4    to a second larger value when support component  166   e  is in a second configuration of  FIG.  3    (e.g., when leading housing portion  139  may be inserted within inner eartip space  16 . 5  and within support component  166   e , the flexibility of support component  166   e  may enable minimum cross-sectional dimension  166   ex  to expand to accommodate leading housing portion  139 , yet may attempt to return to support component  166   e  to its default configuration, thereby exerting an inward retention force on leading housing portion  139  for retaining leading housing portion  139  within inner eartip space  165 ). In some embodiments, a single inner eartip internal support component may have a thickness suitable to extend along a significant portion of the length of inner eartip body  164 . For example, in some embodiments, the thickness  166   et  of support component  166   e  may be long enough not only to extend about at least a portion of leading housing portion  139  within inner eartip space  165  (e.g., to at least partially couple leading housing portion  139  to inner eartip body  164  (e.g., by at least partially retaining leading housing portion  139  within eartip space  165 )) but also to extend about at least another portion of inner eartip space  165  in front of leading housing portion  139  (e.g., a portion of inner eartip space  16 . 5  that is more proximal to inner eartip front end  168  than leading housing portion  139  is to inner eartip front end  168 ), such that support component  166   e  may also be operative to ensure at least a minimum cross-sectional area of that other portion of inner eartip space  165  to ensure an effective sound path for sound S at least through that portion of inner eartip space  165 . In some embodiments, no leading housing portion  139  and no leading sound emitting portion  149  may extend into inner eartip space  165 , such that inner eartip space  165  may be completely hollow. In such instances, the flexibility of inner eartip body  164  may not be affected by any portion of housing subassembly  130  or sound emitting subassembly  140  but may be affected by inner eartip internal support subsystem  166 . 
     Each one of inner eartip internal support components  166   a - 166   e  of inner eartip internal support subsystem  166  may be made of any suitable material (e.g., plastic and/or ceramic and/or metal). Moreover, each one of inner eartip internal support components  166   a - 166   e  of inner eartip internal support subsystem  166  may be formed using any suitable process (e.g., support components  166   a - 166   e  may be insert molded within inner eartip body  164 ). In one particular embodiment, each one of inner eartip internal support components  166   a - 166   e  may be a faceted ring. Inner eartip internal support subsystem  166  may provide internal support to inner eartip body  164  with variable or consistent rigidity such that an effective sound path for sound S through inner eartip space  165  may be ensured (e.g., a minimum cross-sectional area of inner eartip space  165  may be maintained) while enabling certain portions of eartip subassembly  150  to deform during use. For example, each one of support components  166   a - 166   e  may maintain its minimum cross-sectional dimensions at certain portions along the length of inner eartip body  164  where those support components are positioned, while still enabling other portions of inner eartip body  164  where those support components are not positioned to deform (e.g., bend), such that eartip body  164  may be comfortably positioned within a user&#39;s ear canal while still preserving an effective sound path. The materials, geometries and rigidities of the support components and the spacings between the support components may all be selectively varied to control the functionality of inner eartip internal support system  166 . 
     
       FIGS.  5  and  6   
     
       FIGS.  5  and  6    show another illustrative earpiece  220 , which may be similar to earpiece  120  of  FIGS.  1 - 4    but may include an inner eartip internal support system that may also facilitate the coupling of an inner eartip portion to an earpiece housing subassembly and/or to a sound emitting subassembly. Earpiece  220  of  FIGS.  5  and  6    may include similar components to earpiece  120  of  FIGS.  1 - 4   , where elements of earpiece  220  of  FIGS.  5  and  6    being labeled with “2xx” reference labels may correspond to the “1xx” reference labels of the labeled elements of earpiece  120  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, earpiece  220  may include a housing subassembly  230 , a sound emitting subassembly  240  for emitting sound S, and an eartip subassembly  250 , which may include an inner eartip portion  260  and an outer eartip portion  270  coupled to inner eartip portion  260  at interface  255 . Inner eartip portion  260  may include an inner eartip body  264  that may extend between an inner eartip back end  262  and an inner eartip front end  268 , where both an inner eartip interior surface  261  of inner eartip body  264  and an opposite inner eartip exterior surface  269  of inner eartip body  264  may extend between inner eartip back end  262  and inner eartip front end  268 , and where an inner eartip space  265  may be defined by inner eartip interior surface  261  and may extend between an inner eartip back opening  263  that may be provided through inner eartip back end  262  and an inner eartip front opening  267  that may be provided through inner eartip front end  268 . Outer eartip portion  270  may include an outer eartip body  274  that may extend between an outer eartip back end  272  and an outer eartip front end  278 , where both an outer eartip interior surface  271  of outer eartip body  274  and an opposite outer eartip exterior surface  279  of outer eartip body  274  may extend between outer eartip back end  272  and outer eartip front end  278 , and where an outer eartip space  275  may be defined by outer eartip interior surface  271  (e.g., one portion of space  275  may be defined between outer eartip interior surface  271  and inner eartip exterior surface  269  when at least a portion of inner eartip body  264  is positioned between portions of outer eartip interior surface  271 , and another portion of space  275  may be occupied by inner eartip body  264  and inner eartip space  265 ) and may extend between outer eartip back end  272  and outer eartip front end  278 , while an outer eartip back opening  273  may be provided through outer eartip back end  272  and an outer eartip front opening  277  may be provided through outer eartip front end  278 . As shown in  FIG.  5   , outer eartip back end  272  may be configured to be positioned beyond inner eartip back end  262  and, optionally, even beyond the back end of housing subassembly  230  and/or sound emitting subassembly  240  (e.g., in the −Z direction). 
     In some embodiments, at least a portion of inner eartip body  264  may be formed by a material or combination of materials that may be rigid enough to prevent the collapse or a change in the shape of inner eartip space  265  that would negatively affect the quality of sound S being passed through inner eartip space  265 . Additionally or alternatively, an inner eartip internal support subsystem  266  may be provided for affecting the rigidity of inner eartip portion  260 . For example, as shown in  FIGS.  5  and  6   , inner eartip internal support subsystem  266  may include one or more rigid or expandable components, such as a spring inner eartip internal support component  266   s , which may be positioned within a portion of inner eartip body  264  and about a portion of inner eartip space  265 . Spring support component  266   s  may be any suitable type of spring, such as a coil spring made of any suitable material, and may extend between a first spring end  266   sa  and a second spring end  266   sb . The material of spring support component  266   s  may store energy when component  266   s  is compressed or extended or bent but may then return to its natural configuration when unloaded. Spring component  266   s  may be shaped like a helix or any other suitable spiral or otherwise suitably shaped with any suitable twisting direction (e.g., a right handed or left handed spiral with respect to a particular axis). 
     Spring support component  266   s  may be provided using any suitable process. For example, spring support component  266   s  may be insert molded within inner eartip body  264 . Alternatively, spring support component  266   s  may be driven (e.g., screwed) into inner eartip body  264 . For example, spring end  266   sa  may be initially inserted upwardly in the ±Z direction through inner eartip back end  262  while also rotating spring support component  266   s  in the direction of arrow D of  FIG.  6    about the Z-axis until spring support component  266   s  reaches the position of  FIG.  5    with respect to inner eartip body  264 . Alternatively, spring end  266   sb  may be initially inserted downwardly in the −Z direction through inner eartip front end  268  while also rotating sprint, support component  266   s  in the direction opposite to that of arrow D of  FIG.  6    until spring support component  266   s  reaches the position of  FIG.  5    with respect to inner eartip body  264 . 
     At least a portion of spring support component  266   s  of inner eartip internal support subsystem  266  may be contacting inner eartip body  264  in any suitable manner. In some embodiments, spring support component  266   s  may be provided about and against exterior surface  269  of inner eartip body  264  or within space  265  against interior surface  261  of inner eartip body  264 . Alternatively, spring support component  266   s  may be provided at least partially or completely within inner eartip body  264  such that at least one end of spring support component  266   s  may extend out from inner eartip body  264 . For example, as shown in  FIG.  5   , a first portion of spring support component  266   s  (e.g., a portion  266   st  extending between end  266   sa  and point  266   sm  of  FIG.  6   ) may be positioned within inner eartip body  264 , while a second portion of spring support component  266   s  (e.g., a portion  266   sk  extending between point  266   sm  of  FIG.  6    and end  266   sb ) may be positioned outside of inner eartip body  264 . Such a second portion of spring support component  266   s  may be coupled to earpiece housing subassembly  230  and/or sound emitting subassembly  240  for coupling earpiece housing subassembly  230  and sound emitting subassembly  240  to inner ear portion  260 . For example, as shown in  FIG.  5   , while portion  266   st  of spring support component  266   s  may be retained within inner eartip body  264  (e.g., by screwing or insert molding portion  266   st  therein), portion  266   sk  of spring support component  266   s  may be retained within earpiece housing subassembly  230  and/or sound emitting subassembly  240  (e.g., by screwing or insert molding portion  266   sk  therein). In some embodiments, such coupling of earpiece housing subassembly  230  and/or sound emitting subassembly  240  with inner eartip body  264  using spring support component  266   s  may obviate a need for any portion of earpiece housing subassembly  230  and/or sound emitting subassembly  240  to extend into inner eartip space  265  for such coupling (e.g., unlike leading housing portion  139  and/or leading sound emitting portion  149  being positioned within inner eartip space  16 . 5  by insertion distance I of  FIG.  3   ), which may thereby reduce a necessary length of inner eartip space  265  (e.g., for enabling a shorter acoustic cavity) and/or may thereby avoid the flexibility of inner eartip body  264  from being unnecessarily affected by such a portion of earpiece housing subassembly  230  and/or sound emitting subassembly  240  within inner eartip space  265 . In other embodiments, portion  266   st  of spring support component  266   s  may be coupled to inner eartip body  264  about inner eartip space  265  by being held against exterior surface  279  of inner eartip body  264  or by being held against interior surface  271  of inner eartip body  264 . Alternatively or additionally, portion  266   sk  of spring support component  266   s  may be coupled to earpiece housing subassembly  230  and/or to sound emitting subassembly  240  by being held against an exterior surface or an interior surface of housing subassembly  230  and/or of sound emitting subassembly  240 . 
     Inner eartip internal support subsystem  266  may include a single spring support component  266   s  or may include any suitable number of distinct springs provided as multiple distinct spring inner eartip internal support components of inner eartip internal support subsystem  266 , each one of which may span a particular length of inner eartip body  264 , where such particular lengths may be non-overlapping or at least partially overlapping. Each spring support component of inner eartip internal support subsystem  266  may be made of any suitable material (e.g., plastic and/or metal, such as a metal coiled wire or a dense coil spring). Moreover, each spring support component of inner eartip internal support subsystem  266  may be formed using any suitable process and may have any suitable spring characteristics. Inner eartip internal support subsystem  266  may provide internal support to inner eartip body  264  with variable or consistent rigidity such that an effective sound path for sound S through inner eartip space  265  may be ensured (e.g., a minimum cross-sectional area of inner eartip space  265  may be maintained) while enabling certain portions of eartip subassembly  250  to deform during use. For example, spring support component  266   s  may maintain its minimum cross-sectional dimensions at certain portions along the length of inner eartip body  264  (e.g., a consistent cross-sectional dimension may be provided by a cylindrical spring or a cross-sectional dimension may vary along the length of a conical spring), while still enabling other portions of inner eartip body  264  to deform (e.g., bend) along with spring support component  266   s  (e.g., spring support component  266   s  may bend away from the Z-axis), such that eartip body  264  may be comfortably positioned within a user&#39;s ear canal while still preserving an effective sound path. The materials, geometries and rigidities of each spring support component and the spacings between coils of a spring support component in its default configuration may all be selectively varied to control the functionality of inner eartip internal support system  266 . Each coil of spring support component  266   s  may be operative to provide substantially cross-sectional rigidity (e.g., circumferential stiffness) to inner eartip body  264  about a respective portion of inner eartip space  26 . 5  while still enabling outer eartip portion  270  and, perhaps, even portions of inner eartip body  264  extending between two coils of spring support component  266   s , to conform to the bends and shapes of the user&#39;s ear canal when eartip subassembly  250  is positioned therein. For example, inner eartip body  264  may be enabled to bend from a default configuration in which two coils of spring support component  266   s  within inner eartip body  264  may lie parallel to one another (e.g., in parallel planes and/or such that the two coils of spring support component  266   s  may extend about the same axis) to a deformed configuration in which those two coils of spring support component  266   s  within inner eartip body  264  may not be parallel to one another (e.g., in intersecting planes and/or such the two coils of spring support component  266   s  may extend about different axes)). 
     
       FIGS.  7 - 11   
     
       FIGS.  7 - 11    show another illustrative eartip subassembly  350 , which may be similar to eartip subassembly  150  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with one or more support components extending away from an exterior surface of an inner eartip body substantially transversely to a longitudinal length of the inner eartip body for varying the effective rigidity of an exterior surface of an outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries. Eartip subassembly  350  of  FIGS.  7 - 11    may include similar components to eartip subassembly  150  of  FIGS.  1 - 4   , where elements of eartip subassembly  350  of  FIGS.  7 - 11    being labeled with “3xx” reference labels may correspond to the “1 xx” reference labels of the labeled elements of eartip subassembly  150  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, an eartip subassembly  350  may include an inner eartip portion  360  and an outer eartip portion  370  coupled to inner eartip portion  360  at interface  355 . Inner eartip portion  360  may include an inner eartip body  364  that may extend between an inner eartip back end  362  and an inner eartip front end  368 , where both an inner eartip interior surface  361  of inner eartip body  364  and an opposite inner eartip exterior surface  369  of inner eartip body  364  may extend between inner eartip back end  362  and inner eartip front end  368 , and where an inner eartip space  365  may be defined by inner eartip interior surface  361  and may extend between an inner eartip back opening  363  that may be provided through inner eartip back end  362  and an inner eartip front opening  367  that may be provided through inner eartip front end  368 . Outer eartip portion  370  may include an outer eartip body  374  that may extend between an outer eartip back end  372  and an outer eartip front end  378 , where both an outer eartip interior surface  371  of outer eartip body  374  and an opposite outer eartip exterior surface  379  of outer eartip body  374  may extend between outer eartip back end  372  and outer eartip front end  378 , and where an outer eartip space  375  may be defined by outer eartip interior surface  371  (e.g., one portion of space  375  may be defined between outer eartip interior surface  371  and inner eartip exterior surface  369  when at least a portion of inner eartip body  364  is positioned between portions of outer eartip interior surface  371  and another portion of space  375  may be occupied by inner eartip body  364  and inner eartip space  36 . 5 ) and may extend between outer eartip back end  372  and outer eartip front end  378 , while an outer eartip back opening  373  may be provided through outer eartip back end  372  and an outer eartip front opening  377  may be provided through outer eartip front end  378 . Although not shown, eartip subassembly  350  may include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150  or inner eartip internal support system  266  of eartip subassembly  250 . Additionally or alternatively, although not shown, eartip subassembly  350  may be coupled to any suitable housing subassembly and any suitable sound emitting subassembly in any suitable manner for providing any suitable earpiece for a headphone assembly. 
     Eartip subassembly  350  may include an outer eartip internal support subsystem  380  that may be operative to vary the ability of outer eartip exterior surface  379  to conform to various ear canal geometries for improving the ability of eartip subassembly  350  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  380  may be operative to vary the effective surface stiffness of eartip exterior surface  379  along a length of eartip exterior surface  379  (e.g., from outer eartip front end  378  to outer eartip back end  372 ) and/or about a perimeter of eartip exterior surface  379  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  380  may include one or more eartip internal support features (e.g., three eartip internal support features  381 ,  383 , and  385 ), each of which may include one or more support components that may extend from inner eartip exterior surface  369  and about at least a portion of a longitudinal axis of inner eartip exterior surface  369  (e.g., about at least a portion of a longitudinal axis of inner eartip space  565 ) at an anchor end towards a free end that may contact or lie proximal to a portion of outer eartip interior surface  371  (e.g., as one or more transverse support components). Different eartip internal support features of outer eartip internal support subsystem  380  may be spaced longitudinally from one another along the length of inner eartip body  364  and/or along the length of outer eartip interior surface  371  such that different eartip internal support features may be operative to interact with different portions of outer eartip interior surface  371  along the length of outer eartip portion  370  (e.g., from outer eartip front end  378  to outer eartip back end  372 ). 
     As shown in  FIGS.  8  and  9   , outer eartip internal support subsystem  380  may include an outer eartip internal support feature  381  that may extend from inner eartip exterior surface  369  towards outer eartip interior surface  371  (e.g., through a portion of outer eartip space  375 ). For example, outer eartip internal support feature  381  may include a single support component  382  with a support body  382   b  that may extend out to a free end  382   e  from an anchor end  382   a  that may be coupled to or integrated with inner eartip exterior surface  369  about the entirety of a perimeter of inner eartip body  364 . In some embodiments, as shown, for example, thickness  382   t  of support body  382   b  of support component  382  between front and back surfaces of support body  382   b  may be consistent along its entire length (e.g., between anchor end  382   a  and free end  382   e ). Alternatively, the thickness of support body  382   b  of support component  382  may vary as it extends away from inner eartip body  364  (e.g., the thickness of support body  382   b  may increase or decrease as support body  382   b  approaches free end  382   e ). In some embodiments, as shown, for example, angle  3820  at which support body  382   b  may extend away from exterior surface  369  of undeformed inner eartip body  364  at anchor end  382   a  may be 90°. Alternatively, the angle at which support body  382   b  may extend away from undeformed inner eartip body  364  at anchor end  382   a  may be any other suitable angle greater than or less than 90° (see, CAL, the angle at which a support body of eartip internal support feature  385  may extend away from undeformed inner eartip body  364 ). Support body  382   b  may extend linearly from inner eartip body  364  at angle  3820  to free end  382   e . For example, in one particular embodiment, as shown, support body  382   b  may be a flat ring-shaped object (e.g., a three-dimensional annulus) with front and back surfaces that may be flat and/or parallel as extending between ends  382   a  and  382   e , where free end  382   e  may interface with (e.g., contact or lie adjacent to) a portion of outer eartip interior surface  371 . In an undeformed configuration of eartip subassembly  350  of  FIGS.  7 - 11    (e.g., the functional configuration of eartip subassembly  350  without any external forces applied thereto, such as by a user), free end  382   e  of support body  382   b  of support component  382  may contact outer eartip interior surface  371  or may be distanced any suitable distance  382   ed  from outer eartip interior surface  371 , where such a distance  382   ed  may be small enough so as to be closed when outer eartip body  374  may receive an external force on outer eartip exterior surface  379  (e.g., by a user&#39;s ear canal) that may deform outer eartip body  374  to contact at least a portion of free end  382   e  of support component  382  and potentially to deform support component  382  (e.g., to deform support body  382   b  so as to shorten the distance between ends  382   a  and  382   e  of support body  382   b ). 
     One or more flap portions may be provided to extend in any suitable direction from a free end of a support body such that at least a portion (e.g., surface) of the flap portion may interface with (e.g., face towards, contact, and/or be coupled to) a portion of an interior surface of an exterior eartip body. A surface of the flap portion (e.g., an external surface proximate a free end of the flap portion) may be operative to act as a spring-like interface with the exterior eartip body and/or to provide a more expansive surface with which a support body may interact with the exterior eartip body (e.g., as compared to the free end of a support body, which may be limited in size or shape and/or may be operative to buckle when an external force is applied to the free end of the support body in a direction opposite to the direction at which the support body extends from its support body anchor end to its support body free end). For example, while support body  382   b  of support component  382  may extend substantially linearly between ends  382   a  and  382   e , a flap portion  382   f  may be provided at free end  382   e  that may be operative to extend away from support body  382   b  (e.g., at any suitable flap angle  382   f   0 , such as 75°) for following at least a portion of a contour of outer eartip interior surface  371 . For example, as shown, while free end  382   e  of body  382   b  may be an end of a substantially uniformly thick support body  382   b  with a free end surface that may be similar to and/or parallel to anchor end  382   a , flap portion  382   f  may be provided to extend from at least a portion of free end  382   e  for providing a portion of support component  382  that may be operative to provide a larger surface area for interacting with outer eartip interior surface  371 . In its default configuration, flap portion  382   f  may extend downwardly (e.g., for a distance  382   fd ) from free end  382   e  with an exterior flap surface  382   fs  that may be shaped similarly to or otherwise configured to follow a contoured shape similar to that of a portion of outer eartip interior surface  371  that may be interfaced by exterior flap surface  382   fs  (e.g., as shown in  FIG.  8   ), where such interfacing surfaces may be contacting one another or positioned proximate one another when eartip subassembly  350  may be in its default configuration. Flap portion  382   f  may be operative to provide a larger and more gradual interface than free end  382   e  for a portion of outer eartip interior surface  371  with support component  382  during deformation of that portion of outer eartip interior surface  371 . For example, flap portion  382   f  may be operative to act as a soft leaf spring for providing some rigidity to at least the portion of outer eartip interior surface  371  that may contact exterior flap surface  382   fs  during any attempted deformation of that portion of outer eartip interior surface  371  (e.g., the material of a flap portion may have a stiffness and room to deflect (e.g., an arch shaped flap portion may facilitate this action), where tunable parameters to control the stiffness of such a flap portion may be material selection, body thickness, degree and/or radius of such an arch, and where contact between the flap portion and an outer eartip interior surface may be configured to be with a low angle and/or broad to avoid a concentrated contact point). Any flap of any support component of any outer eartip internal support subsystem disclosed herein may be coupled to or integrated with the eartip body with which it interfaces or may simply contact the eartip body with which it interfaces (e.g., contacts the eartip body at all times or only after certain deformation of the outer eartip body). A flap portion of any support component of any outer eartip internal support subsystem disclosed herein may be operative to adjust the geometry of a flap surface to at least partially match the geometry of an eartip body surface with which the flap surface is interfacing (e.g., a contour of at least a portion of a flap surface may match the contour of at least a portion of the eartip body surface with which the flap surface may be interfacing). This may be accomplished in any suitable manner, such as by constructing the flap portion of a material that may be operative to conform to at least one contour (e.g., with respect to one, some, or all suitable spatial dimensions) of a surface with which it is interfacing and/or by constructing the flap portion to have the appropriate contour in its default or undeformed configuration. Each portion may be constructed in any suitable manner, such as the inner eartip body, outer eartip body, and internal support subsystem being molded in a single shot with the same or varying materials (e.g., the inner eartip body may be more rigid for support and the outer eartip body may be more soft for comfort) or in different shots and then coupled or, for example, the inner eartip body may be formed in a first shot and then the internal support subsystem may be formed with a second shot of the same or different material than the first shot. 
     As shown in  FIGS.  8  and  10   , outer eartip internal support subsystem  380  may include an outer eartip internal support feature  383  that may extend from inner eartip exterior surface  369  towards outer eartip interior surface  371  (e.g., through a portion of outer eartip space  375 ). For example, outer eartip internal support feature  383  may include four support components, such as a first support component  384 - 1  with a support body  384 - 1   b  that may extend out to a free end  384 - le  from an anchor end  384 - la  that may be coupled to or integrated with inner eartip exterior surface  369  about a first portion of a perimeter of inner eartip body  364 , a second support component  384 - 2  with a support body  384 - 2   b  that may extend out to a free end  384 - 2   e  from an anchor end  384 - 2   a  that may be coupled to or integrated with inner eartip exterior surface  369  about a second portion of a perimeter of inner eartip body  364 , a third support component  384 - 3  with a support body  384 - 3   b  that may extend out to a free end  384 - 3   e  from an anchor end  384 - 3   a  that may be coupled to or integrated with inner eartip exterior surface  369  about a third portion of a perimeter of inner eartip body  364 , and a fourth support component  384 - 4  with a support body  384 - 4   b  that may extend out to a free end  384 - 4   e  from an anchor end  384 - 4   a  that may be coupled to or integrated with inner eartip exterior surface  369  about a fourth portion of a perimeter of inner eartip body  364 . As shown, each one of free ends  384 - 1   e ,  384 - 2   e ,  384 - 3   e , and  384 - 4   e  may be at least partially provided in the same plane (e.g., a single X-Y plane of  FIG.  10   ), such that each support component of outer eartip internal support feature  383  may be operative to interface with (e.g., face, contact, and/or be coupled to) different portions of outer eartip interior surface  371  within a single cross-sectional periphery thereof. 
     Different support components of outer eartip internal support feature  383  may be configured with different geometries for facing different sized portions of a perimeter of outer eartip interior surface  371 . For example, each one of support components  384 - 1  and  384 - 2  may be configured with similar geometries on opposite sides of inner eartip space  365 , while each one of support components  384 - 3  and  384 - 4  may be configured with similar geometries on opposite sides of inner eartip space  365  that may be offset from each one of support components  384 - 1  and  384 - 2  about inner eartip body  364  (e.g., by about 90°). Support component  384 - 1  may extend from inner eartip exterior surface  369  such that free end  384 - le  may interface with (e.g., extend adjacent to) a relatively small interface portion  379 - 1  of outer eartip interior surface  371  (e.g., 3.6° or 1% of the perimeter of outer eartip interior surface  371  in the X-Y plane of  FIG.  10   ) while support component  384 - 3  may extend from inner eartip exterior surface  369  such that free end  384 - 3   e  may interface with (e.g., extend adjacent to) a relatively large interface portion  379 - 3  of outer eartip interior surface  371  (e.g., 60° or 16% of the perimeter of outer eartip interior surface  371  in the X-Y plane of  FIG.  10   ). A flap portion  384 -If may be provided at free end  384 - le  along the entire perimeter of free end  384 - le  and may extend downwardly (e.g., following a contour of a portion of outer eartip interior surface  371  that may interface with flap portion  384 - 1   f ) and, similarly, a flap portion  384 - 2   f  may be provided at free end  384 - 2   e  along the entire perimeter of free end  384 - 2   e  and may extend downwardly (e.g., following a contour of a portion of outer eartip interior surface  371  that may interface with flap portion  384 - 20 . A flap portion  384 - 3   f  may be provided at free end  384 - 3   e  along only certain portions of the perimeter of free end  384 - 3   e  and may extend downwardly or upwardly (e.g., following any contour of a portion of outer eartip interior surface  371  that may interface with flap portion  384 - 3   f ) and, similarly, a flap portion  384 - 4   f  may be provided at free end  384 - 4   e  along only certain portions of the perimeter of free end  384 - 4   e  and may extend downwardly or upwardly (e.g., following any contour of a portion of outer eartip interior surface  371  that may interface with flap portion  384 - 4   f ). Therefore, a flap portion may extend from an entirety or only a portion of a perimeter of a free end of a support component of an outer eartip internal support feature. Moreover, as shown in  FIG.  10   , the geometry of a free end of a support component may have a variable distance from an adjacent portion of outer eartip interior surface  371  (e.g., an exterior surface of free end  384 - 3   e  of support component  384 - 3  facing outer eartip interior surface  371  may have an irregular shape such that different portions of that exterior surface of free end  384 - 3   e  may have different minimum distances from outer eartip interior surface  371  when eartip subassembly  350  is in its default configuration, which may enable different portions of free end  384 - 3   e  to provide different rigidities to outer eartip interior surface  371 ). 
     Different support components of outer eartip internal support feature  383  may be configured with different geometries for deforming in different manners (e.g., in response to pressure being exerted thereon by outer eartip interior surface  371  in response to outer eartip exterior surface  379  being deformed by an external force of a user). For example, as shown in  FIG.  8   , the geometry of support body  384 - lb  of first support component  384 - 1  in a default configuration may include one or more flexibility features  384 - ly  that may be operative to provide additional flexibility to support body  384 - lb . As just one example, a flexibility feature  384 - ly  may be operative to make the length of a front surface and/or the length of a back surface of support body  384 - lb  longer than the distance between ends  384 - la  and  384 - le  in the default configuration of support body  384 - 1   b , such that support body  384 - lb  may be operative to flex more easily out of plane at such a flexibility feature  384 - 1   y . One or more local cuts, holes, pockets, or reduced thickness portions may be provided along any suitable portion or portions of a support body to vary the flexibility of the support body. Additionally or alternatively, a tapering wall section, a constant thickness section of a varying shape along its length or width (e.g., adding an S-shape or the like within a plane of the body), or the like may be utilized to vary the flexibility of a support body. 
     As shown in  FIGS.  8  and  11   , outer eartip internal support subsystem  380  may include an outer eartip internal support feature  385  that may extend from inner eartip exterior surface  369  towards outer eartip interior surface  371  (e.g., through a portion of outer eartip space  375 ). For example, outer eartip internal support feature  385  may include two support components, such as a first support component  386 - 1  with a front support body  386 - lbf  that may extend out to a free end  386 - le  from a front anchor end  386 - laf  that may be coupled to or integrated with inner eartip exterior surface  369  at a front portion of inner eartip body  364  and a back support body  386 - ibb  that may extend out to that same free end  386 - le  from a back anchor end  386 - lab  that may be coupled to or integrated with inner eartip exterior surface  369  at a back portion of inner eartip body  364 , and a second support component  386 - 2  with a left support body  386 - 2   b   1  that may extend out to a free end  386 - 2   e  from a left anchor end  386 - 2   a   1  that may be coupled to or integrated with inner eartip exterior surface  369  at a left portion of inner eartip body  364  and a right support body  386 - 2   br  that may extend out to free end  386 - 2   e  from a right anchor end  386 - 2   ar  that may be coupled to or integrated with inner eartip exterior surface  369  at a right portion of inner eartip body  364 . As shown, each one of free ends  386 - le  and  386 - 2   e  may be at least partially provided in the same plane (e.g., a single X-Y plane of  FIG.  11   ), such that each support component of outer eartip internal support feature  385  may be operative to interface with different portions of outer eartip interior surface  371  within a single cross-sectional periphery thereof. 
     Different portions of a flap may extend in different directions from a free end of a support body for interfacing with different portions of an outer eartip interior surface. For example, as shown in  FIG.  8   , a flap portion  386 - 1   f  may be provided at free end  386 - le  along a portion or the entirety of free end  386 - le  and an upward portion  386 - ifu  of flap portion  386 - if  may extend upwardly from free end  386 - le  (e.g., following a contour of a portion of outer eartip interior surface  371  extending towards front end  378  that may interface with that upwardly extending portion of flap portion  386 - 1   f ) while a downward portion  386 - 1   fd  of flap portion  386 - 1   f  may extend downwardly from free end  386 - le  (e.g., following a contour of a portion of outer eartip interior surface  371  extending towards back end  372  that may interface with that downwardly extending portion of flap portion  386 - 10 . Alternatively or additionally, as shown in  FIG.  11   , flap portion  386 -If may be provided at free end  386 - le  along a portion or the entirety of free end  386 - le  and a leftward portion  386 - 1   fl  of flap portion  386 - 1   f  may extend leftwardly from free end  386 - le  (e.g., following a contour of a portion of outer eartip interior surface  371  extending in a clockwise direction about the path for sound S of inner eartip space  365  (e.g., about the Z-axis) that may interface with that leftwardly extending portion of flap portion  386 - 1   f ) while a rightward portion  386 - 1   fr  of flap portion  386 - 1   f  may extend rightwardly from free end  386 - le  (e.g., following a contour of a portion of outer eartip interior surface  371  extending in a counter-clockwise direction about the path for sound S of inner eartip space  365  (e.g., about the Z-axis) that may interface with that rightwardly extending portion of flap portion  386 - 1   f ). Therefore, different flap portions may extend in opposite directions from a free end of a particular support body (e.g., upwardly and downwardly, or leftwardly and rightwardly), and/or different flap portions may extend in substantially perpendicular directions from a free end of a particular support body (e.g., upwardly and rightwardly or leftwardly, or downwardly and rightwardly or leftwardly). Different portions of a flap portion or different flap portions coupled to a particular support body (e.g., upward portion  386 - 1   fu  and downward portion  386 - 1   fd ) may be configured to have different rigidities for imparting different flexibility characteristics to the respective different portions of an eartip body surface with which those different flap portions may interface (e.g., during deformation of outer eartip body  374  when eartip subassembly  350  is positioned within a user&#39;s ear canal). 
     In some embodiments, a support component may not be provided with a flap portion but, instead, the free end of the support body of that support component may be shaped to follow the contour of a portion of an outer eartip interior surface. For example, as shown in  FIGS.  8  and  11   , the external surface of free end  386 - 2   e  of support component  386 - 2  may be shaped to match the contour of a portion of outer eartip interior surface  371  that may interface with support component  386 - 2 . Particularly, as shown in  FIG.  8   , a first geometry of the external surface of free end  386 - 2   e  may be operative to match the geometry of a portion of outer eartip interior surface  371  in a Y-Z plane (e.g., along a length of a portion of outer eartip interior surface  371 ) and/or, as shown in  FIG.  11   , a second geometry of the external surface of free end  386 - 2   e  may be operative to match the geometry of a portion of outer eartip interior surface  371  in a X-Y plane (e.g., along a cross-sectional perimeter of a portion of outer eartip interior surface  371 ). 
     Different support components of outer eartip internal support feature  385  may be configured with different geometries for deforming in different manners (e.g., in response to pressure being exerted thereon by outer eartip interior surface  371  in response to outer eartip exterior surface  379  being deformed by an external force of a user). For example, as shown in  FIG.  8   , the geometry of support component  386 - 1  may include two different support bodies (e.g., front support body  386 - lbf  and back support body  386 - 1   bb ) that may extend to the same free end  386 - le  from different anchor points along the length of inner eartip body  364  (e.g., a first anchor point at anchor end  386 - laf  that may be more proximal to front end  368  of inner eartip body  364  and a second anchor point at anchor end  386 - lab  that may be more proximal to back end  362  of inner eartip body  364 ) for defining a longitudinal space  386 - 1   s  therebetween that may be deformed when an external force is applied to flap portion  386 - 1   f  by outer eartip body  374  (e.g., deformation in the Y-Z plane of  FIG.  8   ). As another example, as shown in  FIG.  11   , the geometry of support component  386 - 2  may include two different support bodies (e.g., left support body  386 - 2   b   1  and right support body  386 - 2   br ) that may extend to the same free end  386 - 2   e  from the same or different anchor points about the periphery of inner eartip body  364  for defining a transverse or radial space  386 - 2   s  therebetween that may be deformed when an external force is applied to flap portion  386 - 2   f  by outer eartip body  374  (e.g., deformation in the X-Y plane of  FIG.  11   ). In some embodiments, rather than two support bodies being provided by support component  386 - 1  or support component  386 - 2 , only one of such support bodies may be provided, thereby changing the rigidity of that support component and, thus, the effective surface stiffness of the portion of outer eartip interior surface  371  that may interface with the flap portion or the free end portion of that support component  386 - 1  or that support component  386 - 2 . 
     Eartip internal support features  381 ,  383 , and  385  of outer eartip internal support subsystem  380  may be spaced apart from one another along the length of inner eartip body  164  (e.g., along the Z-axis) in any suitable fashion. For example, each pair of consecutively positioned eartip internal support features may be spaced equidistant from one another along the length of inner eartip body  164  (e.g., spacing distance  389   a  between internal support feature  381  and internal support feature  383  may be the same as spacing distance  389   b  between internal support feature  383  and internal support feature  385 ). Alternatively, the spacing between different pairs of consecutively positioned eartip internal support features may vary along the length of inner eartip body  164  (e.g., spacing distance  389   a  may be shorter or longer than spacing distance  389   b ). 
     Any portion or the entirety of one or more outer eartip internal support features of outer eartip internal support subsystem  380  (e.g., support bodies and/or flap portions of eartip internal support features  381 ,  383 , and  385 ) may be formed of any suitable material, which may be the same as or different than the material of inner eartip body  364 . Moreover, one or more outer eartip internal support features of outer eartip internal support subsystem  380  (e.g., one or more of the support bodies of eartip internal support features  381 ,  383 , and  38 . 5 ) may be coupled to inner eartip portion  360  (e.g., with one or more anchor ends at one or more portions of inner eartip exterior surface  369 ) using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable tasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, one or more outer eartip internal support features of outer eartip internal support subsystem  380  (e.g., eartip internal support features  381 ,  383 , and  385 ) may be molded to or otherwise integrated with inner eartip portion  360  using any suitable process (e.g., in a single or double-shot molding process). Any portion or the entirety of one or more support bodies of one or more support components of one or more outer eartip internal support features of an outer eartip internal support subsystem may be formed of any suitable material, which may be the same as or different than the material of any portion of the entirety of one or more flap portions of one or more support components of one or more outer eartip internal support features of an outer eartip internal support subsystem. Moreover, any flap portion of any eartip internal support feature of an outer eartip internal support subsystem may be coupled to any support body of any eartip internal support feature of an outer eartip internal support subsystem using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable gasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, any flap portion of any eartip internal support feature of an outer eartip internal support subsystem may be molded to or otherwise integrated with any support body of any eartip internal support feature of an outer eartip internal support subsystem using any suitable process (e.g., in a single or double-shot molding process). 
     
       FIGS.  12 - 16   
     
       FIGS.  12 - 15    show another illustrative eartip subassembly  4 . 50 , which may be similar to eartip subassembly  150  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with one or more support components extending away from an exterior surface of an inner eartip body and substantially along a longitudinal length of the inner eartip body for varying the effective rigidity of an exterior surface of an outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries. Eartip subassembly  450  of  FIGS.  12 - 16    may include similar components to eartip subassembly  150  of  FIGS.  1 - 4   , where elements of eartip subassembly  450  of  FIGS.  12 - 16    being labeled with “4xx” reference labels may correspond to the “1 xx” reference labels of the labeled elements of eartip subassembly  150  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, an eartip subassembly  450  may include an inner eartip portion  460  and an outer eartip portion  470  coupled to inner eartip portion  460  at interface  455 . Inner eartip portion  460  may include an inner eartip body  464  that may extend between an inner eartip back end  462  and an inner eartip front end  468 , where both an inner eartip interior surface  461  of inner eartip body  464  and an opposite inner eartip exterior surface  469  of inner eartip body  464  may extend between inner eartip back end  462  and inner eartip front end  468 , and where an inner eartip space  465  may be defined by inner eartip interior surface  461  and may extend between an inner eartip back opening  463  that may be provided through inner eartip back end  462  and an inner eartip front opening  467  that may be provided through inner eartip front end  468 . Outer eartip portion  470  may include an outer eartip body  474  that may extend between an outer eartip back end  472  and an outer eartip front end  478 , where both an outer eartip interior surface  471  of outer eartip body  474  and an opposite outer eartip exterior surface  479  of outer eartip body  474  may extend between outer eartip back end  472  and outer eartip front end  478 , and where an outer eartip space  475  may be defined by outer eartip interior surface  471  (e.g., one portion of space  475  may be defined between outer eartip interior surface  471  and inner eartip exterior surface  469  when at least a portion of inner eartip body  464  is positioned between portions of outer eartip interior surface  471 , and another portion of space  475  may be occupied by inner eartip body  464  and inner eartip space  465 ) and may extend between outer eartip back end  472  and outer eartip front end  478 , while an outer eartip back opening  473  may be provided through outer eartip back end  472  and an outer eartip front opening  477  may be provided through outer eartip front end  478 . Although not shown, eartip subassembly  450  may include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150  or inner eartip internal support system  266  of eartip subassembly  250 . Additionally or alternatively, although not shown, eartip subassembly  450  may be coupled to any suitable housing subassembly and any suitable sound emitting subassembly in any suitable manner for providing any suitable earpiece for a headphone assembly. 
     Eartip subassembly  450  may include an outer eartip internal support subsystem  480  that may be operative to vary the ability of outer eartip exterior surface  479  to conform to various ear canal geometries for improving the ability of eartip subassembly  450  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  480  may be operative to vary the effective surface stiffness of eartip exterior surface  479  along a length of eartip exterior surface  479  (e.g., from outer eartip front end  478  to outer eartip back end  472 ) and/or about a perimeter of eartip exterior surface  479  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  480  may include one or more eartip internal support features (e.g., three eartip internal support features  481 ,  483 , and  485 ), each of which may include one or more support components that may extend from inner eartip exterior surface  469  and along at least a portion of a length of inner eartip exterior surface  469  at an anchor end towards a free end that may contact or lie proximal to a portion of outer eartip interior surface  471  (e.g., as one or more longitudinal support components). Different eartip internal support features of outer eartip internal support subsystem  480  may be spaced longitudinally from one another along the length of inner eartip body  464  and/or along the length of outer eartip interior surface  471  such that different eartip internal support features may be operative to interact with different portions of outer eartip interior surface  471  along the length of outer eartip portion  470  (e.g., from outer eartip front end  478  to outer eartip back end  472 ). 
     As shown in  FIGS.  13  and  14   , outer eartip internal support subsystem  480  may include an outer eartip internal support feature  481  that may extend from inner eartip exterior surface  469  towards outer eartip interior surface  471  (e.g., through a portion of outer eartip space  475 ). For example, outer eartip internal support feature  481  may include one or more support components, such as a first support component  482 - 1  with a support body  482 - 1   b  that may extend out to a free end  482 - 1   e  from an anchor end  482 - la  that may be coupled to or integrated with inner eartip exterior surface  469  along a first longitudinal portion of inner eartip body  464 , a second support component  482 - 2  with a support body  482 - 2   b  that may extend out to a free end  482 - 2   e  from an anchor end  482 - 2   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a second longitudinal portion of inner eartip body  464 , a third support component  482 - 3  with a support body  482 - 3   b  that may extend out to a free end  482 - 3   e  from an anchor end  482 - 3   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a third portion of inner eartip body  464 , and/or a fourth support component  482 - 4  with a support body  482 - 4   b  that may extend out to a free end  482 - 4   e  from an anchor end  482 - 4   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a fourth portion of inner eartip body  464 . The depth of a support body may be consistent or vary along the length of the support body. For example, as shown, depth  482 - 1   d  of support body  482 - lb  of support component  482 - 1  between opposite surfaces of support body  482 - lb  may be consistent along its entire length (e.g., between anchor end  482 - la  and free end  482 - 1   e ), while depth  482 - 2   d  of support body  482 - 2   b  of support component  482 - 2  between opposite surfaces of support body  482 - 2   b  may vary along at least a portion of its length (e.g., between anchor end  482 - 2   a  and free end  482 - 2   e ). 
     Unlike one or more of the support bodies of outer eartip internal support subsystem  380  of  FIGS.  7 - 11   , where the thickness of a support body may be substantially smaller than the depth of that support body (e.g., where thickness  382   t  of support body  382   b  along a Z-direction in a Y-Z plane of  FIG.  8    may be relatively minimal compared to the depth of support body  382   b  that may extend all the way about the Z-axis in the X-Y plane of  FIG.  9   ), the thickness of a support body of outer eartip internal support subsystem  480  of  FIGS.  12 - 16    may be substantially greater than the depth of that support body (e.g., where thickness  482 - 1   t  of support body  482 - 1   b  along a Z-direction in a Y-Z plane of  FIG.  13    may be large compared to depth  482 - id  of support body  482 - lb  that may extend a relatively minimal distance with respect to the Z-axis in the X-Y plane of  FIG.  14   ). Therefore, support components of outer eartip internal support subsystem  480  may be considered longitudinal support components as compared to support components of outer eartip internal support subsystem  380  that may be considered transverse support components. For example, in one particular embodiment, as shown, support body  482 - lb  may be a thin flat rudder-like object with opposite side surfaces that may be flat and/or parallel for defining depth  482 - 1   d  therebetween, where free end  482 - le  may contact or lie adjacent to outer eartip interior surface  471 . In an undeformed configuration of eartip subassembly  450  of  FIGS.  12 - 16    (e.g., the functional configuration of eartip subassembly  450  without any external forces applied thereto, such as by a user), free end  482 - le  of support body  482 - lb  of support component  482 - 1  may contact outer eartip interior surface  471  or may be distanced any suitable spacing distance from outer eartip interior surface  471 , where such a spacing distance may be small enough so as to be closed when outer eartip body  474  may receive an external force on outer eartip exterior surface  479  (e.g., by a user&#39;s ear canal) that may deform outer eartip body  474  to contact at least a portion of free end  482 - le  of support component  482 - 1  and potentially to deform support component  482 - 1  (e.g., to deform support body  482 - lb  so as to shorten the distance between ends  482 - la  and  482 - le  of support body  482 - 1   b ). Support body  482 - 2   b  may be shaped similarly, except, for example, depth  482 - 2   d  may vary in any suitable way between ends  482 - 2   a  and  482 - 2   e.    
     Different support components of outer eartip internal support feature  481  may be configured with different geometries for deforming in different manners (e.g., in response to pressure being exerted thereon by outer eartip interior surface  471  in response to outer eartip exterior surface  479  being deformed by an external force of a user). For example, as shown in  FIG.  14   , the geometry of support body  482 - lb  of first support component  482 - 1  in a default configuration may be substantially linear along its entire length (e.g., along a back surface  482 - lbr  between anchor end  482 - la  and free end  482 - 1   e ), while the geometry of support body  482 - 2   b  may include one or more flexibility features  482 - 2   y  (e.g., along a back surface  482 - 2   br  between anchor end  482 - 2   a  and free end  482 - 2   e ) that may be operative to provide additional flexibility to support body  482 - 2   b . As just one example, a flexibility feature  482 - 2   y  may be operative to make the length of a front surface and/or the length of back surface  482 - 2   br  of support body  482 - 2   b  longer than the distance between ends  482 - 2   a  and  482 - 2   e  in the default configuration of support body  482 - 2   b , such that support body  482 - 2   b  may be operative to flex more easily out of plane at such a flexibility feature  482 - 2   y . One or more local cuts, holes, pockets, or reduced thickness portions may be provided along any suitable portion or portions of a support body to vary the flexibility of the support body. Additionally or alternatively, a tapering wall section, a constant thickness section of a varying shape along its length or width (e.g., adding an S-shape or the like within a plane of the body), varying the size of a coupling between a support body at an anchor end and inner eartip body, or the like may be utilized to vary the flexibility of a support body. 
     While support body  482 - lb  of support component  482 - 1  may extend substantially linearly between ends  482 - la  and  482 - le  within any particular cross-section transverse to interior eartip body  464  (e.g., in any X-Y plane transverse to a Z-axis, as may be shown in  FIG.  14   ), a flap portion  482 - 1   f  may be provided at free end  482 - le  that may be operative to extend away from support body  482 - lb  (e.g., at any suitable flap angle  482 - 1   f θ, such as 85°) within such a particular cross-section for following at least a portion of a contour of outer eartip interior surface  471  (e.g., a portion of the perimeter of outer eartip interior surface  471  that may extend about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). For example, flap portion  482 -If may extend away from free end  482 - le  of support component  482 - 1  and along any suitable portion of outer eartip interior surface  471  (e.g., about 25% of the way along outer eartip interior surface  471  towards adjacent support component  482 - 4 , as shown in  FIG.  14   ), while a flap portion  482 - 4   f  may extend away from free end  482 - 4   e  of support component  482 - 4  and along any suitable portion of outer eartip interior surface  471  (e.g., about 95% of the way along outer eartip interior surface  471  towards adjacent support component  482 - 2 , as shown in  FIG.  14   ). In its default configuration, flap portion  482 - 1   f  may extend about the Z-axis in a counter-clockwise direction from free end  482 - le  with an exterior flap surface that may be shaped similarly to or otherwise follow a contoured shape similar to that of a portion of outer eartip interior surface  471  that may be facing the exterior flap surface of flap portion  482 -If (e.g., as shown in  FIG.  14   ), where such surfaces may be contacting one another or positioned proximate one another when eartip subassembly  450  may be in its default configuration. Flap portion  482 - 1   f  may be operative to provide a larger and more gradual interface than free end  482 - le  for at least a portion of outer eartip interior surface  471  with support component  482 - 1  during deformation of that portion of outer eartip interior surface  471 . For example, flap portion  482 - 1   f  may be operative to act as a soft leaf spring for providing some rigidity to at least the portion of outer eartip interior surface  471  that may contact an exterior flap surface of flap portion  482 - f  during any attempted deformation of that portion of outer eartip interior surface  471 . 
     As shown in  FIG.  14   , each one of support components  482 - 1 ,  482 - 2 ,  482 - 3 , and  482 - 4  may include a respective flap portion that may extend about the Z-axis in a counter-clockwise direction from a respective free end with an exterior flap surface that may be shaped similarly to or otherwise follow a contoured shape similar to that of a portion of outer eartip interior surface  471  that may be facing the exterior flap surface of that respective flap portion. For example, flap portion  482 - if  may extend from free end  482 - le  about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , flap portion  482 - 2   f  may extend from free end  482 - 2   e  about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , flap portion  482 - 3   f  may extend from free end  482 - 3   e  about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , and flap portion  482 - 4   f  may extend from free end  482 - 4   e  about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 . 
     As shown in  FIGS.  13  and  15   , outer eartip internal support subsystem  480  may include an outer eartip internal support feature  483  that may extend from inner eartip exterior surface  469  towards outer eartip interior surface  471  (e.g., through a portion of outer eartip space  475 ). For example, outer eartip internal support feature  483  may include one or more support components, such as a first support component  484 - 1  with a support body  484 - 1   b  that may extend out to a free end  484 - le  from an anchor end  484 - la  that may be coupled to or integrated with inner eartip exterior surface  469  along a fifth longitudinal portion of inner eartip body  464 , a second support component  484 - 2  with a support body  484 - 2   b  that may extend out to a free end  484 - 2   e  from an anchor end  484 - 2   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a sixth longitudinal portion of inner eartip body  464 , a third support component  484 - 3  with a support body  484 - 3   b  that may extend out to a free end  484 - 3   e  from an anchor end  484 - 3   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a seventh portion of inner eartip body  464 , and/or a fourth support component  484 - 4  with a support body  484 - 4   b  that may extend out to a free end  484 - 4   e  from an anchor end  484 - 4   a  that may be coupled to or integrated with inner eartip exterior surface  469  along an eighth portion of inner eartip body  464 . The rotational orientation (e.g., about the longitudinal Z-axis of inner eartip space  465 ) of the fifth longitudinal portion of inner eartip body  464  coupled to anchor end  484 - la  of support component  484 - 1  may be the same as the rotational orientation of the first longitudinal portion of inner eartip body  464  coupled to anchor end  482 - la  of support component  482 - 1 , the rotational orientation of the sixth longitudinal portion of inner eartip body  464  coupled to anchor end  484 - 2   a  of support component  484 - 2  may be the same as the rotational orientation of the second longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 2   a  of support component  482 - 2 , the rotational orientation of the seventh longitudinal portion of inner eartip body  464  coupled to anchor end  484 - 3   a  of support component  484 - 3  may be the same as the rotational orientation of the third longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 3   a  of support component  482 - 3 , and the rotational orientation of the eighth longitudinal portion of inner eartip body  464  coupled to anchor end  484 - 4   a  of support component  484 - 4  may be the same as the rotational orientation of the fourth longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 4   a  of support component  482 - 4 . However, the geometries (e.g., thicknesses or depths) of any two such similarly rotationally oriented support components may differ or be the same. 
     Additionally or alternatively, the rigidities (e.g., flexibilities) of any two such similarly rotationally oriented support components may differ or be the same. For example, although flap portion  482 - 1   f  of support component  482 - 1  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , a flap portion  484 - 1   f  of support component  484 - 1  may extend about the Z-axis in a clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , despite support component  482 - 1  and support component  484 - 1  being similarly rotationally oriented (e.g., extending radially out from inner eartip body  464  at the same rotational orientation with respect to the same Z-axis (e.g., the −Y-direction of  FIG.  13   )). As another example, although flap portion  482 - 2   f  of support component  482 - 2  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , a flap portion  484 - 2   f  of support component  484 - 2  may extend about the Z-axis in a clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , despite support component  482 - 2  and support component  484 - 2  being similarly rotationally oriented (e.g., extending radially out from inner eartip body  464  at the same rotational orientation with respect to the same Z-axis (e.g., the −FY-direction of  FIG.  13   )). As yet another example, although flap portion  482 - 3   f  of support component  482 - 3  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , support component  484 - 3  may not include any flap extending in any direction from end  484 - 3   e , despite support component  482 - 3  and support component  484 - 3  being similarly rotationally oriented (e.g., extending radially out from inner eartip body  464  at the same rotational orientation with respect to the same Z-axis (e.g., the −X-direction of  FIGS.  14  and  15   )). As yet another example, although flap portion  482 - 4   f  of support component  482 - 4  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , support component  484 - 4  may not include any flap extending in any direction from end  484 - 4   e , despite support component  482 - 4  and support component  484 - 4  being similarly rotationally oriented (e.g., extending radially out from inner eartip body  464  at the same rotational orientation with respect to the same Z-axis (e.g., the +X-direction of  FIGS.  14  and  15   )). 
     As shown in  FIGS.  13  and  16   , outer eartip internal support subsystem  480  may include an outer eartip internal support feature  485  that may extend from inner eartip exterior surface  469  towards outer eartip interior surface  471  (e.g., through a portion of outer eartip space  475 ). For example, outer eartip internal support feature  485  may include one or more support components, such as a first support component  486 - 1  with a support body  486 - lb  that may extend out to a free end  486 - le  from an anchor end  486 - la  that may be coupled to or integrated with inner eartip exterior surface  469  along a ninth longitudinal portion of inner eartip body  464 , a second support component  486 - 2  with a support body  486 - 2   b  that may extend out to a free end  484 - 6   e  from an anchor end  484 - 6   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a tenth longitudinal portion of inner eartip body  464 , a third support component  486 - 3  with a support body  486 - 3   b  that may extend out to a free end  486 - 3   e  from an anchor end  486 - 3   a  that may be coupled to or integrated with inner eartip exterior surface  469  along an eleventh portion of inner eartip body  464 , and/or a fourth support component  486 - 4  with a support body  486 - 4   b  that may extend out to a free end  486 - 4   e  from an anchor end  486 - 4   a  that may be coupled to or integrated with inner eartip exterior surface  469  along a twelfth portion of inner eartip body  464 . The rotational orientation (e.g., about the longitudinal Z-axis of inner eartip space  465 ) of the ninth longitudinal portion of inner eartip body  464  coupled to anchor end  486 - la  of support component  486 - 1  may be between the rotational orientation of the first longitudinal portion of inner eartip body  464  coupled to anchor end  482 - la  of support component  482 - 1  and the rotational orientation of the third longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 3   a  of support component  482 - 3 , the rotational orientation (e.g., about the longitudinal Z-axis of inner eartip space  465 ) of the tenth longitudinal portion of inner eartip body  464  coupled to anchor end  486 - 2   a  of support component  486 - 2  may be between the rotational orientation of the third longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 3   a  of support component  482 - 3  and the rotational orientation of the second longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 2   a  of support component  482 - 2 , the rotational orientation (e.g., about the longitudinal Z-axis of inner eartip space  465 ) of the eleventh longitudinal portion of inner eartip body  464  coupled to anchor end  486 - 3   a  of support component  486 - 3  may be between the rotational orientation of the second longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 2   a  of support component  482 - 2  and the rotational orientation of the fourth longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 4   a  of support component  482 - 4 , and the rotational orientation (e.g., about the longitudinal Z-axis of inner eartip space  465 ) of the twelfth longitudinal portion of inner eartip body  464  coupled to anchor end  486 - 4   a  of support component  486 - 4  may be between the rotational orientation of the fourth longitudinal portion of inner eartip body  464  coupled to anchor end  482 - 4   a  of support component  482 - 4  and the rotational orientation of the first longitudinal portion of inner eartip body  464  coupled to anchor end  482 - la  of support component  482 - 1 . 
     The rigidities (e.g., flexibilities) of any two such rotationally offset support components may differ or be the same. For example, just like flap portion  482 - if  of support component  482 - 1  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , a flap portion  486 - 1   f  of support component  486 - 1  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , despite support component  482 - 1  and support component  486 - 1  having offset rotational orientations (e.g.,  450  rotational orientation offset). As another example, just like flap portion  482 - 1   f  of support component  482 - 1  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , a flap portion  486 - 2   f  of support component  486 - 2  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , despite support component  482 - 1  and support component  486 - 2  having offset rotational orientations (e.g.,  450  rotational orientation offset). As yet another example, just like flap portion  482 - 4   f  of support component  482 - 4  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , a flap portion  486 - 3   f  of support component  486 - 3  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , despite support component  482 - 4  and support component  486 - 3  having offset rotational orientations (e.g., 45° rotational orientation offset). As yet another example, just like flap portion  482 - 4   f  of support component  482 - 4  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , a flap portion  486 - 4   f  of support component  486 - 4  may extend about the Z-axis in a counter-clockwise direction with a contour similar to that of an adjacent portion of outer eartip interior surface  471 , despite support component  482 - 4  and support component  486 - 4  having offset rotational orientations (e.g.,  45 ′ rotational orientation offset). The geometries of the flaps of any two such rotationally offset support components may differ or be the same. For example, although each one of flap portions  482 - 1   f ,  482 - 2   f ,  482 - 3   f , and  482 - 4   f  may have a consistent width (e.g., width  482 - 2   fd  of flap portion  482 - 2   f  may be the same along the entire length of flap portion  482 - 2   f  as it extends away from end  482 - 2   e , as shown in  FIG.  14   ), the width of a flap portion of a rotationally offset support component may have a variable width (e.g., width  486 - 2   fd  of flap portion  486 - 2   f  may grow along the entire length of flap portion  486 - 2   f  as it extends away from end  486 - 2   e , as shown in  FIG.  16   ). 
     Different support bodies of different support components of a particular eartip internal support feature of an eartip subassembly may be oriented rotationally offset from one another (e.g., in a single cross-sectional plane transverse to a longitudinal axis of the eartip subassembly), which may be operative to provide variable effective surface stiffness to an outer eartip body of the eartip subassembly about a particular perimeter portion of the outer eartip body within a particular transaxial plane of the eartip subassembly. Alternatively or additionally, a support body of a support component of a first eartip internal support feature of a particular outer eartip internal support subsystem of an eartip subassembly may be oriented rotationally offset from a support body of a support component of a second eartip internal support feature of the same particular outer eartip internal support subsystem of the eartip subassembly (e.g., in respective longitudinally spaced parallel cross-sectional planes that are transverse to a longitudinal axis of the eartip subassembly), which may be operative to provide variable effective surface stiffness to an outer eartip body of the eartip subassembly along a particular perimeter portion of the outer eartip body within a particular longitudinal plane of the eartip subassembly. For example, as shown in  FIGS.  13 - 16   , not only may different support bodies  482 - 1   b ,  482 - 2   b ,  482 - 3   b , and  482 - 4   b  (or free ends) of respective different support components  482 - 1 ,  482 - 2 ,  482 - 3 , and  482 - 4  of eartip internal support feature  481  of eartip subassembly  480  be oriented rotationally offset from one another (e.g., generally by 90° between support bodies  482 - 1   b  and  482 - 3   b , another 90° between support bodies  482 - 3   b  and  482 - 2   b , another 90° between support bodies  482 - 2   b  and  482 - 4   b , and another 90° between support bodies  482 - 4   b  and  482 - 1   b  as rotating clockwise in  FIG.  14    about a longitudinal axis Z in a single cross-sectional plane transverse to that longitudinal axis), but also support body  482 - 1   b  of support component  482 - 1  of eartip internal support feature  481  of outer eartip internal support subsystem  480  of eartip subassembly  450  may be oriented rotationally offset from support body  486 - lb  of support component  486 - 1  of eartip internal support feature  485  of that same outer eartip internal support subsystem  480  of eartip subassembly  450  (e.g., generally by 45° as rotating counter-clockwise about a longitudinal axis Z in respective longitudinally spaced parallel cross-sectional planes of  FIGS.  14  and  16    that are transverse to that longitudinal axis). Therefore, various support components of outer eartip internal support subsystem  480  may be operative to provide variable effective surface stiffness to outer eartip body  474  of eartip subassembly  450  about a particular perimeter portion of outer eartip body  474  within a particular transaxial plane of eartip subassembly  450  (e.g., in the plane of  FIG.  14    and/or in the plane of  FIG.  16   ) and/or along a particular perimeter portion of outer eartip body  474  within a particular longitudinal plane of eartip subassembly  450  (e.g., in the plane of  FIG.  13   ). 
     Different flap portions of different support components of a particular eartip internal support feature of an eartip subassembly may extend in different directions from one another (e.g., in a single cross-sectional plane transverse to a longitudinal axis of the eartip subassembly), which may be operative to provide variable effective surface stiffness to an outer eartip body of the eartip subassembly about a particular perimeter portion of the outer eartip body within a particular transaxial plane of the eartip subassembly. Alternatively or additionally, a flap portion of a support component of a first eartip internal support feature of a particular outer eartip internal support subsystem of an eartip subassembly may extend in a different direction than a flap portion of a support component of a second eartip internal support feature of the same particular outer eartip internal support subsystem of the eartip subassembly (e.g., in respective longitudinally spaced parallel cross-sectional planes that are transverse to a longitudinal axis of the eartip subassembly), which may be operative to provide variable effective surface stiffness to an outer eartip body of the eartip subassembly along a particular perimeter portion of the outer eartip body within a particular longitudinal plane of the eartip subassembly. For example, as shown in  FIGS.  13 - 16   , not only may different flap portions  484 - 1   f  and  484 - 4   f  of respective different support components  484 - i  and  484 - 4  of eartip internal support feature  483  of eartip subassembly  480  extend in different directions from one another (e.g., as shown by  FIG.  1 . 5    with respect to a longitudinal axis Z in a single cross-sectional plane transverse to that longitudinal axis, flap portion  484 - 1   f  may extend generally clockwise away from end  484 - le  about axis Z while flap portion  484 - 4   f  may extend generally counter-clockwise away from end  484 - 4   e  about axis Z), but also flap portion  482 - 1   f  of support component  482 - 1  of eartip internal support feature  481  of outer eartip internal support subsystem  480  of eartip subassembly  450  may extend in a different direction than flap portion  484 - 1   f  of support component  484 - 1  of eartip internal support feature  483  of that same outer eartip internal support subsystem  480  of eartip subassembly  450  (e.g., with respect to a longitudinal axis Z in respective longitudinally spaced parallel cross-sectional planes of  FIGS.  14  and  15    that are transverse to that longitudinal axis, flap portion  482 - 1   f  may extend generally counter-clockwise away from end  482 - le  about axis Z while flap portion  484 - 1   f  may extend generally clockwise away from end  484 - le  about axis Z). Therefore, various flap portions of various support components of outer eartip internal support subsystem  480  may be operative to provide variable effective surface stiffness to outer eartip body  474  of eartip subassembly  450  about a particular perimeter portion of outer eartip body  474  within a particular transaxial plane of eartip subassembly  450  (e.g., in the plane of  FIG.  15   ) and/or along a particular perimeter portion of outer eartip body  474  within a particular longitudinal plane of eartip subassembly  450  (e.g., in the plane of  FIG.  13   ). 
     
       FIGS.  17 - 20   
     
       FIGS.  17 - 20    show another illustrative earpiece  520 , which may be similar to earpiece  120  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with one or more support components extending away from an exterior surface of an inner eartip body spiraling about and along a longitudinal length of the inner eartip body for varying the effective rigidity of an exterior surface of an outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries. Earpiece  520  of  FIGS.  17 - 20    may include similar components to earpiece  120  of  FIGS.  1 - 4   , where elements of earpiece  520  of  FIGS.  17 - 20    being labeled with “5xx” reference labels may correspond to the “lxx” reference labels of the labeled elements of earpiece  120  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, earpiece  520  may include an eartip subassembly  550  that may include an inner eartip portion  560  and an outer eartip portion  570  coupled to inner eartip portion  560  at interface  555 . Inner eartip portion  560  may include an inner eartip body  564  that may extend between an inner eartip back end  562  and an inner eartip front end  568 , where both an inner eartip interior surface  561  of inner eartip body  564  and an opposite inner eartip exterior surface  569  of inner eartip body  564  may extend between inner eartip back end  562  and inner eartip front end  568 , and where an inner eartip space  565  may be defined by inner eartip interior surface  561  and may extend between an inner eartip back opening  563  that may be provided through inner eartip back end  562  and an inner eartip front opening  567  that may be provided through inner eartip front end  568 . Outer eartip portion  570  may include an outer eartip body  574  that may extend between an outer eartip back end  572  and an outer eartip front end  578 , where both an outer eartip interior surface  571  of outer eartip body  574  and an opposite outer eartip exterior surface  579  of outer eartip body  574  may extend between outer eartip back end  572  and outer eartip front end  578 , and where an outer eartip space  575  may be defined by outer eartip interior surface  571  (e.g., one portion of space  575  may be defined between outer eartip interior surface  571  and inner eartip exterior surface  569  when at least a portion of inner eartip body  564  is positioned between portions of outer eartip interior surface  571 , and another portion of space  575  may be occupied by inner eartip body  564  and inner eartip space  565 ) and may extend between outer eartip back end  572  and outer eartip front end  578 , while an outer eartip back opening  573  may be provided through outer eartip back end  572  and an outer eartip front opening  577  may be provided through outer eartip front end  578 . Although not shown, earpiece  520  may include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150 . Alternatively, as shown, earpiece  520  may include inner eartip internal support system  266  of eartip subassembly  2 . 50 . Moreover, earpiece  520  may be coupled to any suitable housing subassembly  530  and any suitable sound emitting subassembly  540  in any suitable manner for providing earpiece  520  for any suitable headphone assembly. 
     Eartip subassembly  550  may include an outer eartip internal support subsystem  580  that may be operative to vary the ability of outer eartip exterior surface  579  to conform to various ear canal geometries for improving the ability of eartip subassembly  550  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  580  may be operative to vary the effective surface stiffness of eartip exterior surface  579  along a length of eartip exterior surface  579  (e.g., from outer eartip front end  578  to outer eartip back end  572 ) and/or about a perimeter of eartip exterior surface  579  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  580  may include one or more eartip internal support features (e.g., eartip internal support feature  581 ), each of which may include one or more support components that may extend from inner eartip exterior surface  569  in a spiral fashion about and along at least a portion of a length of inner eartip exterior surface  569  (e.g., about and along at least a portion of a longitudinal axis of inner eartip space  565 ) at a first end towards a second end that may be coupled to or contact or lie proximal to a portion of outer eartip interior surface  571  (e.g., as a spiral-shaped support component). 
     As shown in  FIGS.  17 - 20   , outer eartip internal support subsystem  580  may include an outer eartip internal support feature  581  that may extend from inner eartip exterior surface  569  towards outer eartip interior surface  571  (e.g., through a portion of outer eartip space  575 ). For example, outer eartip internal support feature  581  may include one or more spiral-shaped support components, such as a first spiral-shaped support component  582 - 1  with a support body  582 - 1   b  that may extend out from a first end  582 - lba  that may be coupled to or integrated with inner eartip exterior surface  569  along and about a first portion of inner eartip body  564  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)) and to a second end  582 - lbe  that may be interfaced with (e.g., coupled to or integrated with or at least proximately facing) an interface portion of outer eartip interior surface  571 , which may define a spiral with respect to a longitudinal axis of eartip subassembly  550  (e.g., a spiral along and about a first portion of outer eartip body  574  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)), a second spiral-shaped support component  582 - 2  with a support body  582 - 2   b  that may extend out from a first end  582 - 2   ba  that may be coupled to or integrated with inner eartip exterior surface  569  along and about a second portion of inner eartip body  564  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)) and to a second end  582 - 2   be  that may be interfaced with (e.g., coupled to or integrated with or at least proximately facing) an interface portion of outer eartip interior surface  571 , which may define a spiral with respect to a longitudinal axis of eartip subassembly  550  (e.g., a spiral along and about a second portion of outer eartip body  574  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)), a third spiral-shaped support component  582 - 3  with a support body  582 - 3   b  that may extend out from a first end  582 - 3   ba  that may be coupled to or integrated with inner eartip exterior surface  569  along and about a third portion of inner eartip body  564  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)) and to a second end  582 - 3   be  that may be interfaced with (e.g., coupled to or integrated with or at least proximately facing) an interface portion of outer eartip interior surface  571 , which may define a spiral with respect to a longitudinal axis of eartip subassembly  550  (e.g., a spiral along and about a third portion of outer eartip body  574  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)), and a fourth spiral-shaped support component  582 - 4  with a support body  582 - 4   b  that may extend out from a first end  582 - 4   ba  that may be coupled to or integrated with inner eartip exterior surface  569  along and about a fourth portion of inner eartip body  564  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)) and to a second end  582 - 4   be  that may be interfaced with (e.g., coupled to or integrated with or at least proximately facing) an interface portion of outer eartip interior surface  571 , which may define a spiral with respect to a longitudinal axis of eartip subassembly  550  (e.g., a spiral along and about a fourth portion of outer eartip body  574  (e.g., in a spiral path or as a helix, such as along a Z-axis and about a portion of inner eartip space  565  (e.g., about the Z-axis)). 
     The geometries of different support bodies of eartip internal support feature  581  may be the same or may vary in any suitable way. The depth of a support body may be consistent or may vary in any suitable manner along the support body. For example, as shown, depth  582 - 1   d  of support body  582 - lb  of support component  582 - 1  between opposite surfaces  582 - 1   sa  and  582 - lsb  of support body  582 - lb  may be consistent along its entirety (e.g., between end  582 - lba  and end  582 - be ), while depth  582 - 4   d  of support body  582 - 4   b  of support component  582 - 4  between opposite surfaces  582 - 4   sa  and  582 - 4   sb  of support body  582 - 4   b  may vary along at least a portion of support body  582 - 4   b  (e.g., between end  582 - 4   ba  and end  582 - 4   be ). The height of each support body may be the same or may vary between support bodies. For example, the height of first support body  582 - lb  may be configured to span the entirety or substantially the entirety of the height of eartip subassembly  350  (e.g., such that a front portion of first end  582 - lba  may be at inner eartip front end  568  and/or a front portion of second end  582 - ibe  may be at outer eartip front end  578 , and such that a back portion of first end  582 - 1   ba  may be at inner eartip back end  562  and/or a back portion of second end  582 - 1   be  may be at outer eartip back end  572 ), while the height of third support body  582 - 3   b  may be configured to span only a specific portion of the entirety of the height of eartip subassembly  350  (e.g., such that a front portion of first end  582 - 3   ba  may be positioned downwardly (e.g., in the −Z direction) from inner eartip front end  568  and/or a front portion of first end  582 - 3   be  may positioned downwardly from outer eartip front end  578 , and/or such that a back portion of first end  582 - 3   ba  may be positioned upwardly (e.g., in the ±Z direction) from inner eartip back end  562  and/or a back portion of second end  582 - 3   be  may be positioned upwardly from outer eartip back end  572  (e.g., as shown in  FIGS.  19  and  20   )). 
     Different support components of outer eartip internal support feature  581  may be configured with different geometries for deforming in different manners (e.g., in response to pressure being exerted thereon by outer eartip interior surface  571  in response to outer eartip exterior surface  579  being deformed by an external force of a user). For example, as shown in  FIGS.  19  and  20   , the geometry of support body  582 - 3   b  of third support component  582 - 3  in a default configuration may include one or more flexibility features  582 - 3   y  that may be operative to provide additional flexibility to support body  582 - 3   b . As just one example, a flexibility feature  582 - 3   y  may be operative to make the length of a back surface  582 - 3   br  of support body  582 - 3   b  longer than the distance between ends  582 - 3   ba  and  582 - 3   be  defining that back surface  582 - 3   br  in the default configuration of support body  582 - 3   b , such that support body  582 - 3   b  may be operative to flex more easily at such a flexibility feature  582 - 3   y  (e.g., for increasing or decreasing the distance between ends  582 - 3   ba  and  582 - 3   be  defining that back surface  582 - 3   br  when support body  582 - 3   b  may be deformed in any suitable manner). One or more local cuts, holes, pockets, or reduced thickness portions may be provided along any suitable portion or portions of a support body to vary the flexibility of the support body. Additionally or alternatively, a tapering wall section, a constant thickness section of a varying shape along its length or width (e.g., adding an S-shape or the like within a plane of the body), varying the size of a coupling between a support body at an anchor end and an eartip body, varying the degree and/or angle of the rotation, spiral, or twist, varying the rate of the rotation, spiral, or twist along its length (i.e., along the Z-axis), or the like may be utilized to vary the flexibility of a support body. 
     Any suitable relationships between different spiral-shaped support components of outer eartip internal support feature  581  may exist. For example, any suitable number of spiral-shaped support components may be provided by outer eartip internal support feature  581  (e.g., four spiral-shaped support components as may be shown in  FIGS.  18 - 20    or more or fewer than four). As another example, the amount at which any one of the spiral-shaped support components twists about a longitudinal axis may be any suitable amount (e.g., about 45°, about 90° (e.g., as may be shown for each one of the spiral-shaped support components of  FIGS.  18 - 20   , although different components may twist in different amounts), about 180°, about 360°, or more than 360°). As yet another example, the direction in which any one of the spiral-shaped support components twists about a longitudinal axis may be any suitable direction (e.g., clockwise or counter-clockwise (e.g., as may be shown for each one of the spiral-shaped support components of  FIGS.  18 - 20    with respect to the line of site of  FIG.  20   , although different components may twist in different directions)). As yet another example, the rotational offset between any two of the spiral-shaped support components, such as at their back surfaces (and/or at their front surfaces), may be any suitable offset (e.g., about 15°, about 4.5°, about 90° (e.g., as may be shown between back surface  582 - lbr  of support body  582 - 1   b  and back surface  582 - 3   br  of support body  582 - 3   b , between back surface  582 - lbr  of support body  582 - 1   b  and back surface  582 - 4   br  of support body  582 - 4   b , and between back surface  582 - 2   br  of support body  582 - 2   b  and back surface  582 - 3   br  of support body  582 - 3   b  in  FIG.  19   , although any two components may be oriented rotationally offset from one another in any suitable manner), about 135°, about 180°, and the like). As yet another example, the manner in which a support body of outer eartip internal support feature  581  may extend from a curve of inner eartip exterior surface  569  may be any suitable manner (e.g., tangentially (e.g., as may be shown by each support body of  FIGS.  19  and  20   , for example, where back surface  582 - lbr  of support body  582 - lb  may extend tangentially from curved inner eartip exterior surface  569  and/or where end  582 - lbe  may extend tangentially from the curved inner eartip exterior surface  569 ) or as a secant (e.g., as may be shown by support body  384 - lb  extending from curved inner eartip exterior surface  369  of  FIG.  10   )). 
     The particular embodiment of outer eartip internal support feature  581  shown in  FIGS.  17 - 20    may have four support components with four spiral-shaped support bodies, where all of the four spiral-shaped support bodies may twist in the same direction about a longitudinal axis Z by 90° (e.g., the amount by which second end  582 - lbe  may twist about axis Z (e.g., as second end  582 - 1   be  may extend from a front of first end  582 - lba  (e.g., at or proximal to front end  568  of inner eartip body  564  at inner eartip exterior surface  569  and at or proximal to front end  578  of outer eartip body  574  at outer eartip interior surface  571 ) to back surface  582 - lbr  (e.g., at or proximal to back end  578  of outer eartip body  574  at outer eartip interior surface  571 ))), and where each of the four spiral-shaped support bodies may be oriented rotationally offset from two other ones of the four spiral-shaped support bodies by 90°, such that no gap may exist along eartip subassembly  550  between any two spiral-shaped support bodies (e.g., the combination of spiral-shaped support bodies may span the full exterior circumference of inner eartip exterior surface  569  about axis Z). Similarly, if there were six spiral-shaped support bodies where each one was twisting in the same direction about a longitudinal axis Z by 60° and where each one was oriented rotationally offset from two other ones by 60°, no gap may exist. Alternatively, the number, rotation direction, twist amount, and/or rotational offset amount of spiral-shaped components may be such that a gap may exist. 
     Each spiral-shaped support component of outer eartip internal support feature  581  may be coupled to inner eartip body  564  and/or outer eartip body  574  in any suitable manner. In some embodiments, only one portion of a support body of a support component may be coupled to one of inner eartip body  564  and outer eartip body  574  and no portion of that support body may be coupled to the other one of inner eartip body  564  and outer eartip body  574  but instead may simply face or be proximate thereto for contact during certain deformation of eartip subassembly  550 . However, in other embodiments, as shown in  FIGS.  17 - 20   , at least two portions of a first end of each spiral-shaped support component may be coupled to different portions of inner eartip body  564  and at least two portions of a second end of each spiral-shaped support component may be coupled to different portions of outer eartip body  574 . For example, a front portion of first end  582 - iba  of first support component  582 - 1  may be coupled to a front portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip front end  568 , a front portion of second end  582 - 1   be  of first support component  582 - 1  (e.g., proximal to front portion of first end  582 - lba ) may be coupled to a front portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip front end  578 , a rear portion of first end  582 - lba  of first support component  582 - 1  may be coupled to a rear portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip rear end  562 , and a rear portion of second end  582 - lbe  of first support component  582 - 1  (e.g., proximal to back surface  582 - lbr  of first support component  582 - 1 ) may be coupled to a rear portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip rear end  572 , such that different ends of support body  582 - lb  of first support component  582 - 1  may be coupled to both inner eartip body  564  and outer eartip body  574 . Moreover, a front portion of first end  582 - 2   ba  of second support component  582 - 2  may be coupled to a front portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip front end  568 , a front portion of second end  582 - 2   be  of second support component  582 - 2  (e.g., proximal to front portion of first end  582 - 2   ba ) may be coupled to a front portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip front end  578 , a rear portion of first end  582 - 2   ba  of second support component  582 - 2  may be coupled to a rear portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip rear end  562 , and a rear portion of second end  582 - 2   be  of second support component  582 - 2  (e.g., proximal to back surface  582 - 2   br  of first support component  582 - 2 ) may be coupled to a rear portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip rear end  572 , such that different ends of support body  582 - 2   b  of second support component  582 - 2  may be coupled to both inner eartip body  564  and outer eartip body  574 . Moreover, a front portion of first end  582 - 3   ba  of third support component  582 - 3  may be coupled to a front portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip front end  568 , a front portion of second end  582 - 3   be  of third support component  582 - 3  (e.g., proximal to front portion of first end  582 - 3   ba ) may be coupled to a front portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip front end  578 , a rear portion of first end  582 - 3   ba  of third support component  582 - 3  may be coupled to a rear portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip rear end  562 , and a rear portion of second end  582 - 3   be  of third support component  582 - 3  (e.g., proximal to back surface  582 - 3   br  of third support component  582 - 3 ) may be coupled to a rear portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip rear end  572 , such that different ends of support body  582 - 3   b  of third support component  582 - 3  may be coupled to both inner eartip body  564  and outer eartip body  574 . Moreover, a front portion of first end  582 - 3   ba  of fourth support component  582 - 4  may be coupled to a front portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip front end  568 , a front portion of second end  582 - 4   be  of fourth support component  582 - 4  (e.g., proximal to front portion of first end  582 - 4   ba ) may be coupled to a front portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip front end  578 , a rear portion of first end  582 - 4   ba  of fourth support component  582 - 4  may be coupled to a rear portion of inner eartip body  564  at inner eartip exterior surface  569  at or near inner eartip rear end  562 , and a rear portion of second end  582 - 4   be  of fourth support component  582 - 4  (e.g., proximal to back surface  582 - 4   br  of fourth support component  582 - 4 ) may be coupled to a rear portion of outer eartip body  574  at outer eartip interior surface  571  at or near outer eartip rear end  572 , such that different ends of support body  582 - 4   b  of fourth support component  582 - 4  may be coupled to both inner eartip body  564  and outer eartip body  574 . 
     Such coupling of different ends of each support body of each support component of outer eartip internal support feature  581  of outer eartip internal support subsystem  580  to both inner eartip body  564  and outer eartip body  574  may enable a user to twist eartip subassembly  550  (e.g., with respect to a housing subassembly and/or a sound emitting subassembly of a headphone assembly including eartip subassembly  550 ) for contracting or expanding the size (e.g., a cross-sectional area) of eartip subassembly  550  for enabling easier insertion into and/or removal from a user&#39;s ear canal of eartip subassembly  550  while also enabling eartip subassembly  550  to form an acoustic seal with the user&#39;s ear canal. Inner eartip portion  560  may be twisted with respect to outer eartip portion  570  (or vice versa) before, after, or while earpiece  520  is inserted into a user&#39;s ear. For example, such twisting of eartip subassembly  550  in a first direction about longitudinal axis Z (e.g., in the same direction with which the spiral-shaped support components of spring component  266   s  may twist about axis Z in the default configuration (e.g., the direction of arrow TC of  FIGS.  19  and  20    and/or the arrow D of  FIG.  6   )) may be operative to contract or tighten the circumference or cross-sectional area of any suitable portion(s) of eartip subassembly  550  (e.g., to contract the inner cross-sectional area or diameter SD of spring support component  266   s  from its default configuration (e.g., to any inner cross-sectional area or diameter that may or may not be less than the minimum cross-sectional dimensions that spring support component  266   s  may be configured to maintain when only external forces provided by the user&#39;s ear canal are exerted on earpiece  520 ) and/or to contract the inner cross-sectional area or diameter ID of inner eartip space  565  from its default configuration and/or to contract the inner cross-sectional area or diameter OD of outer eartip space  575  from its default configuration), which may enable a user to insert eartip subassembly  550  into a user&#39;s ear canal more easily and/or to remove eartip subassembly  5 . 50  from a user&#39;s ear canal more easily. Additionally or alternatively, such twisting of eartip subassembly  550  in a second direction about longitudinal axis Z (e.g., in a direction opposite to the direction with which the spiral-shaped support components of spring component  266   s  may twist about axis Z in the default configuration (e.g., the direction of arrow TE of  FIGS.  19  and  20   )) may be operative to expand or loosen the circumference or cross-sectional area of any suitable portion(s) of eartip subassembly  550  (e.g., to expand the inner cross-sectional area or diameter SD of spring support component  266   s  from a contracted configuration to its default configuration and/or to expand the inner cross-sectional area or diameter ID of inner eartip space  56 . 5  from a contracted configuration to its default configuration and/or to expand the inner cross-sectional area or diameter OD of outer eartip space  575  from a contracted configuration to its default configuration), which may enable a user to expand eartip subassembly  550  once eartip subassembly  550  has been inserted into a user&#39;s ear canal for creating an acoustic seal therein. Therefore, spring support component  266   s  may be configured such that the inner cross-sectional area or diameter SD of spring support component  266   s  may not only be contracted (e.g., from its default configuration) to a first contracted configuration when deformed by first forces exerted on eartip subassembly  5 . 50  through active user manipulation (e.g., when twisted by a user&#39;s hand(s)) for easier insertion into or removal from an ear canal but may also be contracted (e.g., from its default configuration) to a second contracted configuration when deformed by forces exerted on eartip subassembly  550  by the surfaces of a user&#39;s ear canal. Such a first contracted configuration may provide a smaller inner cross-sectional area or diameter SD than the inner cross-sectional area or diameter SD of the second contracted configuration, such that the inner cross-sectional area or diameter SD of the second contracted configuration may be no smaller than the inner cross-sectional area or diameter SD that may ensure at least the minimum inner cross-sectional area or diameter ID of inner eartip space  565  for enabling an effective (e.g., non-distorting or non-blocking) sound path for sound S through inner eartip space  565 , yet such that the inner cross-sectional area or diameter SD of the first contracted configuration may be small enough to enable comfortable insertion into or removal from the ear canal of eartip subassembly  550 . 
     As shown, earpiece  520  may include inner eartip internal support system  266  of eartip subassembly  250 , which may be operative to couple eartip subassembly  550  to housing subassembly  530  and/or sound emitting subassembly  540 . When a twisting reference component (e.g., any suitable portion of housing subassembly  530  and/or any suitable portion of sound emitting subassembly  540 ) is coupled to eartip subassembly  550  (e.g., to inner eartip body  564 ) using inner eartip internal support system  266  at least partially with spring support component  266   s , and then a user twists eartip subassembly  550  with respect to such a twisting reference component for contracting or expanding the size of eartip subassembly  550 , the size of spring support component  266   s  may likewise be contracted or expanded (e.g., to contract the inner cross-sectional area or diameter SD of spring support component  266   s  from its default configuration or to expand the inner cross-sectional area or diameter SD of spring support component  266   s  from a contracted configuration to its default configuration), which may further enable a user to insert eartip subassembly  5 . 50  into a user&#39;s ear canal more easily and/or to remove eartip subassembly  550  from a user&#39;s ear canal more easily. 
     Although not shown, in some embodiments, if each one of a pair of two earpieces of a headset assembly is provided with an eartip subassembly similar to eartip subassembly  550 , certain directions associated with the eartip subassembly for a first earpiece of such a particular pair (e.g., the directions with which spiral-shaped support components twist with respect to an inner eartip body, the direction with which a spring support component spirals through an inner eartip body, and/or the directions of arrows TC and TE with respect to a longitudinal axis for respectively collapsing and expanding the eartip subassembly) may be reversed for the eartip subassembly for the second earpiece of that particular pair, such that a user may more easily expand or contract both eartip subassemblies at the same time during use (e.g., forwardly twisting both the left and right eartip subassemblies from the point of view of the user may be operative to expand the eartip subassemblies of both earpieces rather than to expand one and to contract the other). Additionally or alternatively, it is to be understood that any one or more of the support components of outer eartip internal support feature  581  of outer eartip internal support subsystem  580  may include one or more suitable flap portions, as described with respect to flap portions of  FIGS.  7 - 16   . For example, as shown in  FIG.  20   , support component  582 - 4  may include a flap portion  582 - 4   fa  that may extend from body  582 - 4   b  (e.g., along at least a portion of outer eartip interior surface  571  adjacent outer eartip back end  572 ), and/or support component  582 - 4  may include a flap portion  582 - 4   fb  that may extend from body  582 - 4   b  (e.g., in a spiral along and about at least a portion of outer eartip interior surface  571 ). Additionally or alternatively, although not shown in  FIGS.  17 - 20   , it is to be understood that outer eartip internal support subsystem  580  may include one or more additional outer eartip internal support features along with outer eartip internal support feature  581  (e.g., a second outer eartip internal support feature positioned longitudinally above or below outer eartip internal support feature  581  along and about inner eartip body  564 , such as an additional outer eartip internal support feature with one or more additional spiral-shaped support components that may have any suitable geometries or orientations or twisting directions that may be the same as or different than that of the spiral-shaped support components of outer eartip internal support feature  581 ). 
     
       FIGS.  21 - 25   
     
       FIGS.  21 - 25    show another illustrative earpiece  620 , which may be similar to earpiece  120  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with one or more support components that may extend inwardly from an interior surface of an outer eartip body for varying the effective rigidity of an exterior surface of the outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries. Earpiece  620  of  FIGS.  21 - 25    may include similar components to earpiece  120  of  FIGS.  1 - 4   , where elements of earpiece  620  of  FIGS.  21 - 25    being labeled with “6xx” reference labels may correspond to the “1 xx” reference labels of the labeled elements of earpiece  120  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, earpiece  620  may include an eartip subassembly  6 . 50  that may include an inner eartip portion  660  and an outer eartip portion  670  coupled to inner eartip portion  660  at interface  655 . Inner eartip portion  660  may include an inner eartip body  664  that may extend between an inner eartip back end  662  and an inner eartip front end  668 , where both an inner eartip interior surface  661  of inner eartip body  664  and an opposite inner eartip exterior surface  669  of inner eartip body  664  may extend between inner eartip back end  662  and inner eartip front end  668 , and where an inner eartip space  665  may be defined by inner eartip interior surface  661  and may extend between an inner eartip back opening  663  that may be provided through inner eartip back end  662  and an inner eartip front opening  667  that may be provided through inner eartip front end  668 . Outer eartip portion  670  may include an outer eartip body  674  that may extend between an outer eartip back end  672  and an outer eartip front end  678 , where both an outer eartip interior surface  671  of outer eartip body  674  and an opposite outer eartip exterior surface  679  of outer eartip body  674  may extend between outer eartip back end  672  and outer eartip front end  678 , and where an outer eartip space  675  may be defined by outer eartip interior surface  671  (e.g., one portion of space  675  may be defined between outer eartip interior surface  671  and inner eartip exterior surface  669  when at least a portion of inner eartip body  664  is positioned between portions of outer eartip interior surface  671 , and another portion of space  675  may be occupied by inner eartip body  664  and inner eartip space  665 ) and may extend between outer eartip back end  672  and outer eartip front end  678 , while an outer eartip back opening  673  may be provided through outer eartip back end  672  and an outer eartip front opening  677  may be provided through outer eartip front end  678 . Earpiece  620  may also include any suitable housing subassembly  630  and any suitable sound emitting subassembly  640  for emitting sound S through inner eartip space  665 , one or both of which may be coupled to eartip subassembly  6 . 50  in any suitable manner. Although not shown, earpiece  620  may also include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150  or inner eartip internal support system  266  of eartip subassembly  250 , which may be operative to couple eartip subassembly  650  to housing subassembly  630  and/or to sound emitting subassembly  640 . 
     Eartip subassembly  650  may include an outer eartip internal support subsystem  680  that may be operative to vary the ability of outer eartip exterior surface  679  to conform to various ear canal geometries for improving the ability of eartip subassembly  650  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  680  may be operative to vary the effective surface stiffness of eartip exterior surface  679  along a length of eartip exterior surface  679  (e.g., from outer eartip front end  678  to outer eartip back end  672 ) and/or about a perimeter of eartip exterior surface  679  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  680  may include one or more eartip internal support features (e.g., three eartip internal support features  681 ,  683 , and  685 ), each of which may include one or more support components that may either be coupled to and extend from inner eartip exterior surface  669  along and/or about a longitudinal length of inner eartip body  664  at an anchor end towards a free end that may contact or lie proximal to a portion of outer eartip interior surface  671  (e.g., as one or more outwardly extending transverse and/or longitudinal and/or spiral support components) or be coupled to and extend from outer eartip interior surface  671  along and/or about a longitudinal length of outer eartip body  674  at an anchor end towards a free end that may contact or lie proximal to a portion of inner eartip exterior surface  669  (e.g., as one or more inwardly extending transverse and/or longitudinal and/or spiral support components). Different eartip internal support features of outer eartip internal support subsystem  680  may be spaced longitudinally from one another along the length of inner eartip body  664  and/or along the length of outer eartip interior surface  671  such that different eartip internal support features may be operative to interact with different portions of outer eartip interior surface  671  along the length of outer eartip portion  670  (e.g., from outer eartip front end  678  to outer eartip back end  672 ). 
     As shown in  FIGS.  22 - 24   , outer eartip internal support subsystem  680  may include an outer eartip internal support feature  681  that may extend from outer eartip interior surface  671  towards inner eartip exterior surface  669  (e.g., through a portion of outer eartip space  675 ). For example, as shown, outer eartip internal support feature  681  may include sixteen support components, although any other suitable number is possible, including support components  682 - 1 ,  682 - 2 ,  682 - 3 , and  682 - 4 , each of which may include a support body that may extend inwardly towards inner eartip exterior surface  669  to a free end from an anchor end that may be coupled to or integrated with outer eartip interior surface  671  (e.g., support component  682 - 1  may include a support body  682 - 1   b  extending inwardly from anchor end  682 - la  to free end  682 - 1   e , support component  682 - 2  may include a support body  682 - 2   b  extending inwardly from anchor end  682 - 2   a  to free end  682 - 2   e , support component  682 - 3  may include a support body  682 - 3   b  extending inwardly from anchor end  682 - 3   a  to free end  682 - 3   e , and support component  682 - 4  may include a support body  682 - 4   b  extending inwardly from anchor end  682 - 4   a  to free end  682 - 4   e ). Any support body of outer eartip internal support feature  681  may have any suitable geometry (e.g., thickness and/or depth) that may be consistent and/or variable across its length. Moreover, any support body may form any suitable angle with outer eartip interior surface  671  as it extends therefrom towards inner eartip exterior surface  669 . For example, as shown, support body  682 - lb  may extend linearly from outer eartip body  674  to free end  682 - le  (e.g., in a plane of  FIG.  23    that may be transverse to longitudinal axis Z). In an undeformed configuration of eartip subassembly  650  of  FIGS.  21 - 25    (e.g., the functional configuration of eartip subassembly  650  without any external forces applied thereto, such as by a user), free end  682 - le  of support body  682 - 1   b  of support component  682 - 1  may contact inner eartip exterior surface  669  or may be distanced any suitable distance therefrom, where such a distance may be small enough so as to be closed when outer eartip body  674  may receive an external force on outer eartip exterior surface  679  (e.g., by a user&#39;s ear canal) that may deform outer eartip body  674  for moving anchor end  682 - la  and thus free end  682 - le  of support body  682 - lb  to contact at least a portion inner eartip exterior surface  669  of inner eartip body  664  and potentially to deform support component  682 - 1  (e.g., to deform support body  682 - 1   b  so as to shorten the distance between ends  682 - la  and  682 - le  of support body  682 - 1   b ). 
     Different support components of outer eartip internal support feature  681  may be configured with different geometries for deforming in different manners (e.g., in response to pressure being exerted thereon by outer eartip interior surface  671  in response to outer eartip exterior surface  679  being deformed by an external force of a user). For example, as shown in  FIG.  22   , the geometry of support body  682 - 2   b  of support component  682 - 2  in a default configuration may include one or more flexibility features  682 - 2   y  that may be operative to provide additional flexibility to support body  682 - 2   b . As just one example, a flexibility feature  682 - 2   y  may be operative to make the length of a front surface and/or the length of a back surface of support body  682 - 2   y  longer than the length between ends  682 - 2   a  and  682 - 2   e  in the default configuration of support body  682 - 2   b , such that support body  682 - 2   b  may be operative to flex more easily out of plane at such a flexibility feature  682 - 2   y.    
     While support body  682 - 1   b  of support component  682 - la  may extend substantially linearly between ends  682 - la  and  682 - 1   e , a flap portion  682 -If may be provided at free end  682 - le  that may be operative to extend away from support body  682 - lb  (e.g., at any suitable flap angle) for following at least a portion of a contour of inner eartip exterior surface  669 . For example, as shown, while free end  682 - le  of body  682 - lb  may be an end of a substantially uniformly thick support body  682 - 1   b  with a free end surface, flap portion  682 - 1   f  may be provided to extend from at least a portion of free end  682 - le  for providing a portion of support component  682 - 1  that may be operative to provide a larger surface area for interacting with inner eartip exterior surface  669 . In its default configuration, flap portion  682 - 1   f  may extend downwardly for any suitable distance from free end  682 - 1   e  with an exterior flap surface that may be shaped similarly to or otherwise follow a contoured shape similar to that of a portion of inner eartip exterior surface  669  that may be facing the exterior flap surface, where such surfaces may be contacting one another or positioned proximate one another when eartip subassembly  6 . 50  may be in its default configuration. Flap portion  682 - 1   f  may be operative to provide a larger and more gradual interface than free end  682 - le  for a portion of inner eartip exterior surface  669  with support component  682 - 1  when a portion of outer eartip interior surface  671  coupled to anchor end  682 - la  of support component  682 - i  may be deformed. For example, flap portion  682 - if  may be operative to act as a soft leaf spring for providing some rigidity to at least the portion of inner eartip exterior surface  669  that may contact an exterior flap surface of flap portion  682 - if  during any attempted deformation of a particular portion of outer eartip interior surface  671  (e.g., at or adjacent anchor end  682 - 1   a ). Any one or more of the support components of outer eartip internal support feature  681  may include a flap portion (e.g., flap portion  682 - 1   f  coupled to free end  682 - 1   e , flap portion  682 - 2   f  coupled to free end  682 - 2   e , flap portion  682 - 3   f  coupled to free end  682 - 3   e , and flap portion  682 - 4   f  coupled to free end  682 - 4   e ). Alternatively, no flap portion may be provided on one or more free ends of one or more support components of outer eartip interior surface  671 . 
     As shown in  FIGS.  22 ,  24 , and  25   , outer eartip internal support subsystem  680  may include an outer eartip internal support feature  683  with one or more support components (e.g., support components  684 - 1  and  684 - 2 ) that may extend from outer eartip interior surface  671  towards inner eartip exterior surface  669  (e.g., through a portion of outer eartip space  67 . 5 ) as well as one or more support components (e.g., support components  684 - 3  and  684 - 4 ) that may extend from inner eartip exterior surface  669  towards outer eartip interior surface  671  (e.g., through a portion of outer eartip space  675 ). For example, outer eartip internal support feature  683  may include four support components, such as a first support component  684 - 1  with a front support body  684 - lbf  that may extend out to a free end  684 - 1   e  from a front anchor end  684 - 1   af  that may be coupled to or integrated with outer eartip interior surface  671  at a front portion of outer eartip body  674  and a back support body  684 - 1   bb  that may extend out to free end  684 - le  from a back anchor end  684 - lab  that may be coupled to or integrated with outer eartip interior surface  671  at a back portion of outer eartip body  674 , a second support component  684 - 2  with a left support body  684 - 2   b   1  that may extend out to a free end  684 - 2   e  from a left anchor end  684 - 2   a   1  that may be coupled to or integrated with outer eartip interior surface  671  at a left portion of outer eartip body  674  and a right support body  684 - 2   br  that may extend out to free end  684 - 2   e  from a right anchor end  684 - tar  that may be coupled to or integrated with outer eartip interior surface  671  at a right portion of outer eartip body  674 , a third support component  684 - 3  with a support body  684 - 3   b  that may extend out to a free end  684 - 3   e  from an anchor end  684 - 3   a  that may be coupled to or integrated with inner eartip exterior surface  669  about a portion of a perimeter of inner eartip body  664 , and a fourth support component  684 - 4  with a support body  684 - 4   b  that may extend out to a free end  684 - 4   e  from an anchor end  684 - 4   a  that may be coupled to or integrated with inner eartip exterior surface  669  about a portion of a perimeter of inner eartip body  664 . As shown, each one of free ends  684 - 1   e ,  684 - 2   e ,  684 - 3   e , and  684 - 4   e  may be at least partially provided in the same plane (e.g., a single X-Y plane of  FIG.  25   ), such that each support component of outer eartip internal support feature  683  may be operative to interface with different portions of outer eartip interior surface  671  and different portions of inner eartip exterior surface  669  within a single cross-sectional periphery thereof. 
     Different portions of a flap may extend in different directions from a free end of a support body for interfacing with different portions of an inner eartip exterior surface. For example, as shown in  FIG.  22   , a flap portion  684 - 1   f  may be provided at free end  684 - le  along a portion or the entirety of free end  684 - le  and an upward portion of flap portion  684 -If may extend upwardly from free end  684 - le  (e.g., following a contour of a portion of inner eartip exterior surface  669  extending towards front end  668  that may interface with that upwardly extending portion of flap portion  684 - 10  while a downward portion of flap portion  684 - 1   f  may extend downwardly from free end  684 - le  (e.g., following a contour of a portion of inner eartip exterior surface  669  extending towards back end  662  that may interface with that downwardly extending portion of flap portion  684 - 1   f ). Alternatively or additionally, as shown in  FIG.  25   , flap portion  684 -If may be provided at free end  684 - le  along a portion or the entirety of free end  684 - le  and a leftward portion of flap portion  684 - 1   f  may extend leftwardly from free end  684 - le  (e.g., following a contour of a portion of inner eartip exterior surface  669  extending in a clockwise direction about the path for sound S of inner eartip space  665  (e.g., about the Z-axis) that may interface with that leftwardly extending portion of flap portion  684 - 10  while a rightward portion of flap portion  684 - 1   f  may extend rightwardly from free end  684 - le  (e.g., following a contour of a portion of inner eartip exterior surface  669  extending in a counter-clockwise direction about the path for sound S of inner eartip space  665  (e.g., about the Z-axis) that may interface with that rightwardly extending portion of flap portion  684 - 1   f ). Different portions of a flap (e.g., an upward portion and downward portion) may be configured to have different rigidities for imparting different flexibility characteristics to the respective different portions of an inner eartip exterior surface with which those different flap portions may interface (e.g., during deformation of outer eartip body  674  when eartip subassembly  650  is positioned within a user&#39;s ear canal). 
     In some embodiments, a support component may not be provided with a flap portion but, instead, the free end of the support body of that support component may be shaped to follow the contour of a portion of an outer eartip interior surface. For example, as shown in  FIGS.  22    and  25 , the external surface of free end  684 - 2   e  of support component  686 - 2  may be shaped to match the contour of a portion of inner eartip exterior surface  669  that may interface with support component  684 - 2 . Particularly, as shown in  FIG.  22   , a first geometry of the external surface of free end  684 - 2   e  may be operative to match the geometry of a portion of inner eartip exterior surface  669  in a Y-Z plane (e.g., along a length of a portion of inner eartip exterior surface  669 ) and/or, as shown in  FIG.  25   , a second geometry of the external surface of free end  684 - 2   e  may be operative to match the geometry of a portion of inner eartip exterior surface  669  in a X-Y plane (e.g., along a transverse cross-sectional perimeter of a portion of inner eartip exterior surface  669 ). 
     Different support components of outer eartip internal support feature  683  may be configured with different geometries for deforming in different manners (e.g., in response to pressure being exerted thereon by outer eartip interior surface  671  in response to outer eartip exterior surface  679  being deformed by an external force of a user). For example, as shown in  FIG.  22   , the geometry of support component  684 - 1  may include two different support bodies (e.g., front support body  684 - lbf  and back support body  684 - 1   bb ) that may extend to the same free end  684 - le  from different anchor points along the length of outer eartip body  674  (e.g., a first anchor point at anchor end  684 - laf  that may be more proximal to front end  678  of outer eartip body  674  and a second anchor point at anchor end  684 - lab  that may be more proximal to back end  672  of outer eartip body  674 ) for defining a longitudinal space  684 - ls  therebetween that may be deformed when an external force is applied by a portion of outer eartip body  674  to anchor end  684 - laf  and/or anchor end  684 - lab  (e.g., deformation in the Y-Z plane of  FIG.  22   ). As another example, as shown in  FIG.  25   , the geometry of support component  684 - 2  may include two different support bodies (e.g., left support body  684 - 2   b   1  and right support body  684 - 2   br ) that may extend to the same free end  684 - 2   e  from the same or different anchor ends about the periphery of outer eartip interior surface  671  of outer eartip body  674  for defining a transverse or radial space  684 - 2   s  therebetween that may be deformed when an external force is applied by a portion of outer eartip body  674  to anchor end  684 - 2   ar  and/or anchor end  684 - 2   a   1  (e.g., deformation in the X-Y plane of  FIG.  25   ). In some embodiments, rather than two support bodies being provided by support component  684 - 1  or support component  684 - 2 , only one of such support bodies may be provided, thereby changing the rigidity of that support component and, thus, the effective surface stiffness of the portion of outer eartip interior surface  671  that may be coupled to that support component  684 - 1  or that support component  684 - 2 . 
     As shown in  FIGS.  22  and  24   , outer eartip internal support subsystem  680  may include an outer eartip internal support feature  685  with one or more support components (e.g., support components  686 - 1  and  686 - 2 ) that may extend from outer eartip interior surface  671  towards an exterior housing surface  137  of earpiece housing subassembly  130  and/or of sound emitting subassembly  140  (e.g., through a portion of outer eartip space  675 ) as well as one or more support components (e.g., support components  686 - 3  and  686 - 4 ) that may extend from exterior housing surface  137  of earpiece housing subassembly  130  and/or of sound emitting subassembly  140  towards outer eartip interior surface  671  (e.g., through a portion of outer eartip space  675 ). For example, outer eartip internal support feature  685  may include four support components, such as a first support component  686 - 1  that may include a support body  686 - lb  extending inwardly to a free end  686 - le  from an anchor end  686 - la  that may be coupled to or integrated with outer eartip interior surface  671  of outer eartip body  674 , a second support component  686 - 2  that may include a support body  686 - 2   b  extending inwardly to a free end  686 - 2   e  from an anchor end  686 - 2   a  that may be coupled to or integrated with outer eartip interior surface  671  of outer eartip body  674 , a third support component  686 - 3  with a support body  686 - 3   b  that may extend out to a free end  686 - 3   e  from an anchor end  686 - 3   a  that may be coupled to or integrated with a portion of exterior housing surface  137 , and a fourth support component  686 - 4  with a support body  686 - 4   b  that may extend out to a free end  686 - 4   e  from an anchor end  686 - 4   a  that may be coupled to or integrated with a portion of exterior housing surface  137 . 
     Different portions of a flap may extend in different directions from a free end of a support body for interfacing with different portions of exterior housing surface  137 . For example, as shown in  FIG.  22   , a flap portion  686 - 1   f  may be provided at free end  686 - le  along a portion or the entirety of free end  686 - 1   e  of support body  686 - 1   b  for interfacing with any suitable portion of exterior housing surface  137  (e.g., a side surface and/or a bottom surface of housing subassembly  130  and/or of sound emitting subassembly  140 ), which may not only provide additional rigidity to a portion of outer eartip interior surface  671  of outer eartip body  674  that may be proximal to anchor end  686 - la  (e.g., when deformation of that portion of outer eartip interior surface  671  may result in flap portion  686 - 1   f  and/or free end portion  686 - le  contacting exterior housing surface  137 ), but may also provide for some support of housing subassembly  130  and/or of sound emitting subassembly  140  (e.g., by providing a surface on which exterior housing surface  137  may at least partially rest). Similarly, as shown in  FIG.  22   , a flap portion  686 - 2   f  may be provided at free end  686 - 2   e  along a portion or the entirety of free end  686 - 2   e  of support body  686 - 2   b  for interfacing with any suitable portion of exterior housing surface  137 , which may not only provide additional rigidity to a portion of outer eartip interior surface  671  of outer eartip body  674  that may be proximal to anchor end  686 - 2   a  (e.g., when deformation of that portion of outer eartip interior surface  671  may result in flap portion  686 - 2   f  and/or free end portion  686 - 2   e  contacting exterior housing surface  137 ), but may also provide for some support of housing subassembly  130  and/or of sound emitting subassembly  140  (e.g., by providing a surface on which exterior housing surface  137  may at least partially rest). Additionally or alternatively, different portions of a flap may extend in different directions from a free end of a support body for interfacing with different portions of outer eartip interior surface  671 . For example, as shown in  FIG.  24   , a flap portion  686 - 3   f  may be provided at free end  686 - 3   e  along a portion or the entirety of free end  686 - 3   e  of support body  686 - 3   b  for interfacing with any suitable portion of outer eartip interior surface  671 , which may provide additional rigidity to a portion of outer eartip interior surface  671  of outer eartip body  674  that may be proximal to flap portion  686 - 3   f  and/or free end  686 - 3   e  (e.g., when deformation of that portion of outer eartip interior surface  671  may result in flap portion  686 - 3   f  and/or free end portion  686 - 3   e  contacting outer eartip interior surface  671 ). Similarly, as shown in  FIG.  24   , a flap portion  686 - 4   f  may be provided at free end  686 - 4   e  along a portion or the entirety of free end  686 - 4   e  of support body  686 - 4   b  for interfacing with any suitable portion of outer eartip interior surface  671 , which may provide additional rigidity to a portion of outer eartip interior surface  671  of outer eartip body  674  that may be proximal to flap portion  686 - 4   f  and/or free end  686 - 4   e  (e.g., when deformation of that portion of outer eartip interior surface  671  may result in flap portion  686 - 4   f  and/or free end portion  686 - 4   e  contacting outer eartip interior surface  671 ). Therefore, exterior housing surface  137  (e.g., any suitable portion of housing subassembly  130  and/or of sound emitting subassembly  140 ) may be operative to provide additional rigidity to outer eartip body  674  via any suitable intervening internal support component during deformation of outer eartip body  674 . 
     Eartip internal support features  681 ,  683 , and  685  of outer eartip internal support subsystem  680  may be spaced apart from one another along the length of earpiece  620  (e.g., along the Z-axis) in any suitable fashion. For example, each pair of consecutively positioned eartip internal support features may be spaced equidistant from one another along the length of earpiece  620 . Alternatively, the spacing between different pairs of consecutively positioned eartip internal support features may vary along the length of earpiece  620 . 
     Any portion or the entirety of one or more outer eartip internal support features of outer eartip internal support subsystem  680  (e.g., support bodies and/or flap portions of eartip internal support features  681 ,  683 , and  68 . 5 ) may be formed of any suitable material, which may be the same as or different than the material of inner eartip body  664 , outer eartip body  674 , and/or exterior housing surface  137 . Moreover, one or more outer eartip internal support features of outer eartip internal support subsystem  680  (e.g., one or more of the support bodies of eartip internal support features  681 ,  683 , and  685 ) may be coupled to the appropriate one of inner eartip portion  660 , outer eartip portion  670 , and exterior housing surface  137  (e.g., with one or more anchor ends) using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable gasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, one or more outer eartip internal support features of outer eartip internal support subsystem  680  (e.g., eartip internal support features  681 ,  683 , and  685 ) may be molded to or otherwise integrated with the appropriate one of inner eartip portion  660 , outer eartip portion  670 , and exterior housing surface  137  using any suitable process (e.g., in a single or double-shot molding process). 
     
       FIGS.  26 - 28   
     
       FIGS.  26 - 28    show another illustrative eartip subassembly  750 , which may be similar to eartip subassembly  150  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with at least one support component that may define a fluid enclosure coupled to or integrally formed with an interior surface of an outer eartip body for varying the effective rigidity of an exterior surface of the outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries. Eartip subassembly  750  of  FIGS.  26 - 28    may include similar components to eartip subassembly  150  of  FIGS.  1 - 4   , where elements of eartip subassembly  750  of  FIGS.  26 - 28    being labeled with “7xx” reference labels may correspond to the “1 xx” reference labels of the labeled elements of eartip subassembly  1 . 50  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, eartip subassembly  750  may include an inner eartip portion  760  and an outer eartip portion  770  coupled to inner eartip portion  760  at interface  755 . Inner eartip portion  760  may include an inner eartip body  764  that may extend between an inner eartip back end  762  and an inner eartip front end  768 , where both an inner eartip interior surface  761  of inner eartip body  764  and an opposite inner eartip exterior surface  769  of inner eartip body  764  may extend between inner eartip back end  762  and inner eartip front end  768 , and where an inner eartip space  765  may be defined by inner eartip interior surface  761  and may extend between an inner eartip back opening  763  that may be provided through inner eartip back end  762  and an inner eartip front opening  767  that may be provided through inner eartip front end  768 . Outer eartip portion  770  may include an outer eartip body  774  that may extend between an outer eartip back end  772  and an outer eartip front end  778 , where both an outer eartip interior surface  771  of outer eartip body  774  and an opposite outer eartip exterior surface  779  of outer eartip body  774  may extend between outer eartip back end  772  and outer eartip front end  778 , and where an outer eartip space  775  may be defined by outer eartip interior surface  771  (e.g., one portion of space  775  may be defined between outer eartip interior surface  771  and inner eartip exterior surface  769  when at least a portion of inner eartip body  764  is positioned between portions of outer eartip interior surface  771 , and another portion of space  775  may be occupied by inner eartip body  764  and inner eartip space  765 ) and may extend between outer eartip back end  772  and outer eartip front end  778 , while an outer eartip back opening  773  may be provided through outer eartip back end  772  and an outer eartip front opening  777  may be provided through outer eartip front end  778 . Although not shown, eartip subassembly  750  may include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150  or inner eartip internal support system  266  of eartip subassembly  250 . Additionally or alternatively, although not shown, eartip subassembly  750  may be coupled to any suitable housing subassembly and any suitable sound emitting subassembly in any suitable manner for providing any suitable earpiece for a headphone assembly. 
     Eartip subassembly  750  may include an outer eartip internal support subsystem  780  that may be operative to vary the ability of outer eartip exterior surface  779  to conform to various ear canal geometries for improving the ability of eartip subassembly  750  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  780  may be operative to vary the effective surface stiffness of eartip exterior surface  779  along a length of eartip exterior surface  779  (e.g., from outer eartip front end  778  to outer eartip back end  772 ) and/or about a perimeter of eartip exterior surface  779  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  780  may include one or more eartip internal support features, such as outer eartip internal support feature  781 . As shown in  FIGS.  26 - 28   , outer eartip internal support feature  781  may include four fluid enclosure support components  782 - 1 ,  782 - 2 ,  782 - 3 , and  782 - 4 , although any other suitable number of fluid enclosure support components may be provided (e.g., 1, 2, 3, or many more than 4). First fluid enclosure support component  782 - 1  may include a support body  782 - 1   b  that may be coupled to or integrated with outer eartip interior surface  771  in any suitable manner along any suitable path  771 - 1   p  on outer eartip interior surface  771  such that at least a portion of an exterior surface  782 - 1   x  of support body  782 - lb  and the portion of outer eartip interior surface  771  within path  771 - lp  (i.e., outer eartip interior surface portion  771 - 1   n ) may together define a fluid enclosure space  782 - ls  between outer eartip interior surface portion  771 - in  of outer eartip interior surface  771  within path  771 - lp  and exterior surface  782 - 1   x  of support body  782 - 1   b , and such that at least a portion of an interior surface  782 - li  of support body  782 - 1   b  (e.g., opposite to exterior surface  782 - 1   x ) may contact or lie proximal to a portion of inner eartip exterior surface  769 . Similarly, second fluid enclosure support component  782 - 2  may include a support body  782 - 2   b  that may be coupled to or integrated with outer eartip interior surface  771  in any suitable manner along any suitable path  771 - 2   p  on outer eartip interior surface  771  such that at least a portion of an exterior surface  782 - 2   x  of support body  782 - 2   b  and the portion of outer eartip interior surface  771  within path  771 - lp  (i.e., outer eartip interior surface portion  771 - 2   n ) may together define a fluid enclosure space  782 - 2   s  between outer eartip interior surface portion  771 - 2   n  of outer eartip interior surface  771  within path  771 - 2   p  and exterior surface  782 - 2   x  of support body  782 - 2   b , and such that at least a portion of an interior surface  782 - 2   i  of support body  782 - 2   b  (e.g., opposite to exterior surface  782 - 2   x ) may contact or lie proximal to a portion of inner eartip exterior surface  769 . Similarly, third fluid enclosure support component  782 - 3  may include a support body  782 - 3   b  that may be coupled to or integrated with outer eartip interior surface  771  in any suitable manner along any suitable path  771 - 3   p  on outer eartip interior surface  771  such that at least a portion of an exterior surface  782 - 3   x  of support body  782 - 3   b  and the portion of outer eartip interior surface  771  within path  771 - 3   p  (i.e., outer eartip interior surface portion  771 - 3   n ) may together define a fluid enclosure space  782 - 3   s  between outer eartip interior surface portion  771 - 3   n  of outer eartip interior surface  771  within path  771 - 3   p  and exterior surface  782 - 3   x  of support body  782 - 3   b , and such that at least a portion of an interior surface  782 - 3   i  of support body  782 - 3   b  (e.g., opposite to exterior surface  782 - 3   x ) may contact or lie proximal to a portion of inner eartip exterior surface  769 . Similarly, fourth fluid enclosure support component  782 - 4  may include a support body  782 - 4   b  that may be coupled to or integrated with outer eartip interior surface  771  in any suitable manner along any suitable path  771 - 4   p  on outer eartip interior surface  771  such that at least a portion of an exterior surface  782 - 4   x  of support body  782 - 4   b  and the portion of outer eartip interior surface  771  within path  771 - 4   p  (i.e., outer eartip interior surface portion  771 - 4   n ) may together define a fluid enclosure space  782 - 4   s  between outer eartip interior surface portion  771 - 4   n  of outer eartip interior surface  771  within path  771 - 4   p  and exterior surface  782 - 4   x  of support body  782 - 4   b , and such that at least a portion of an interior surface  782 - 4   i  of support body  782 - 4   b  (e.g., opposite to exterior surface  782 - 4   x ) may contact or lie proximal to a portion of inner eartip exterior surface  769 . 
     As shown, each one of paths  771 - lp  through  771 - 4   p  may be unique and non-overlapping. For example, fluid enclosure spaces  782 - 1   s  through  782 - 4   s  may be rotationally offset from one another about a longitudinal axis by any suitable amount (e.g., by 90°, as may be shown in the X-Y plane of  FIG.  28    about longitudinal axis Z). Alternatively, two or more of paths  771 - lp  through  771 - 4   p  may overlap such that a portion of an outer eartip interior surface portion of a first path may be the same as a portion of an outer eartip interior surface portion of a second path. 
     The geometry of a support body of a fluid enclosure support component may be consistent or variable. For example, as shown, thickness  782 - 1   t  of support body  782 - 1   b  of support component  782 - 1  between exterior surface  782 - 1   x  and interior surface  782 - 1   i  of support body  782 - lb  may be consistent along its entirety (e.g., between any two portions of support body  782 - 1   b  coupled to any two portions of path  771 - 1   p ). Alternatively, as shown, thickness  782 - 2   t  of support body  782 - 2   b  of support component  782 - 2  between exterior surface  782 - 2   x  and interior surface  782 - 2   i  of support body  782 - 2   b  may vary along different portions thereof. The size and shape of each fluid enclosure space defined by each fluid enclosure support component may be the same as each other, or the size and/or shape of one fluid enclosure space defined by one fluid enclosure support component may be different than that of another fluid enclosure space defined by another fluid enclosure support. A fluid enclosure space defined by a fluid enclosure support component may be any suitable size and/or any suitable shape. In an undeformed configuration of eartip subassembly  750  of  FIGS.  26 - 28    (e.g., the functional configuration of eartip subassembly  750  without any external forces applied thereto, such as by a user), at least a portion of an interior surface of a support body may contact inner eartip exterior surface  769  or may be distanced any suitable distance from inner eartip exterior surface  769 . For example, as shown, at least a portion of interior surface  782 - 4   i  of support body  782 - 4   b  may contact inner eartip exterior surface  769 . In some embodiments, such contact may be maintained by coupling interior surface  782 - 4   i  of support body  782 - 4   b  to inner eartip exterior surface  769  (e.g., with adhesive(s), mechanical fastener(s), manufacturing techniques (e.g., molding), and the like). Alternatively, as shown, a portion of interior surface  782 - 1   i  of support body  782 - lb  may be distanced any suitable distance  782 - led  from inner eartip exterior surface  769 , where such a distance  782 - led  may be small enough so as to be closed when outer eartip body  774  may receive an external force on outer eartip exterior surface  779  (e.g., by a user&#39;s ear canal) that may deform outer eartip interior surface portion  771 - in  of outer eartip interior surface  771  within path  771 - lp  such that the shape of fluid enclosure space  782 - 1   s  may be deformed for pushing a portion of interior surface  782 - 1   i  of support body  782 - 1   b  against a portion of inner eartip exterior surface  769 . 
     Any suitable fluid may be held within a fluid enclosure space of a fluid enclosure support component in the default configuration of eartip subassembly  750 , such as any suitable gas (e.g., air), any suitable liquid (e.g., water), any combination thereof (e.g., gel), and the like, which may be operative to deform when the shape of the fluid enclosure space deforms due to deformation of any suitable portion of the surfaces defining the fluid enclosure space. In some embodiments, the volume of such fluid may remain constant throughout the use of eartip subassembly  750  (e.g., the volume of such fluid in the default configuration of the fluid enclosure space may be the same as when the fluid enclosure space is deformed (e.g., when eartip subassembly  750  is positioned within a user&#39;s ear canal)). In other embodiments, the volume of such fluid may vary throughout the use of eartip subassembly  750  (e.g., fluid may be enabled to enter and exit the fluid enclosure space as the fluid enclosure space changes shapes). For example, as shown, support body  782 - 1   b  of fluid enclosure support component  782 - 1  may include one or more valves  782 - 1   v  that may be operative to selectively enable a fluid to enter into fluid enclosure space  782 - ls  and/or to exit fluid enclosure space  782 - 1   s  therethrough. In some embodiments, valve  782 - 1   v  may be operative to enable a user to adjust the volume of fluid within fluid enclosure space  782 - 1   s  of fluid enclosure support component  782 - 1 . For example, valve  782 - 1   v  may be operative to enable a user to remove some or substantially all air from fluid enclosure space  782 - 1   s  prior to and/or during insertion of eartip subassembly  750  into the user&#39;s ear canal, and then valve  782 - 1   v  may be operative to enable a user to add air into fluid enclosure space  782 - 1   s  while eartip subassembly  750  is positioned within the user&#39;s ear canal, thereby enabling eartip subassembly  750  to be more easily inserted into an ear canal when fluid enclosure space  782 - 1   s  containing less fluid and then to be more strongly held within the ear canal when fluid enclosure space  782 - 1   s  contains more fluid. In some embodiments, valve  782 - 1   v  may be a passive type valve, such as a one-way reed valve, where internal pressure may be directed and/or controlled by any suitable external mechanism, such as a mechanism in a housing subassembly and/or in a sound emitting subassembly and/or any suitable external adjustment tool. Additionally or alternatively, valve  782 - 1   v  may be operative to enable a user to manually inflate and/or deflate fluid enclosure space  782 - 1   s  by any suitable amount. 
     Additionally or alternatively, it is to be understood that any one or more of the support components of outer eartip internal support feature  781  of outer eartip internal support subsystem  780  may include one or more suitable flap portions, as described with respect to any flap portions of  FIGS.  7 - 25    (e.g., extending in any suitable direction(s) from any suitable portion of interior surface  782 - 1   i  of support body  782 - lb  with any suitable shape (e.g., for interfacing with and/or matching a contour of inner eartip exterior surface  769  (e.g., as shown by flap portion  782 - 1   fa  of support component  782 - 1 ) and/or of interior surface  782 - 3   i  of support body  782 - 3   b  and/or of interior surface  782 - 4   i  of support body  782 - 4   b  ((e.g., as shown by flap portion  782 - lib  of support component  782 - 1 ))). Additionally or alternatively, although not shown in  FIGS.  26 - 28   , it is to be understood that outer eartip internal support subsystem  780  may include one or more additional outer eartip internal support features along with outer eartip internal support feature  781  (e.g., a second outer eartip internal support feature positioned longitudinally above or below outer eartip internal support feature  781  along and about outer eartip body  774  and/or along and about inner eartip body  764 , such as an additional outer eartip internal support feature defining one or more additional fluid enclosure spaces that may have any suitable geometries or orientations that may be the same as or different than that of the fluid enclosure spaces of outer eartip internal support feature  781 ). 
     Any portion or the entirety eartip internal support feature  781  of outer eartip internal support subsystem  780  (e.g., support bodies and/or flap portions of eartip internal support feature  781 ) may be formed of any suitable material, which may be the same as or different than the material of inner eartip body  764  and/or outer eartip body  774 . Moreover, one or more support bodies of outer eartip internal support subsystem  780  may be coupled to inner eartip portion  760  and/or outer eartip portion  770  using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable gasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, one or more support bodies of outer eartip internal support subsystem  780  may be molded to or otherwise integrated with inner eartip portion  760  and/or outer eartip portion  770  using any suitable process (e.g., in a single or double-shot molding process). 
     
       FIGS.  29 - 31   
     
       FIGS.  29 - 31    show another illustrative eartip subassembly  8 . 50 , which may be similar to eartip subassembly  150  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with at least one support component that may define a fluid enclosure coupled to or integrally formed with an exterior surface of an inner eartip body for varying the effective rigidity of an exterior surface of an outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries. Eartip subassembly  850  of  FIGS.  29 - 31    may include similar components to eartip subassembly  150  of  FIGS.  1 - 4   , where elements of eartip subassembly  850  of  FIGS.  29 - 31    being labeled with “7xx” reference labels may correspond to the “lxx” reference labels of the labeled elements of eartip subassembly  150  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, eartip subassembly  8 . 50  may include an inner eartip portion  860  and an outer eartip portion  870  coupled to inner eartip portion  860  at interface  855 . Inner eartip portion  860  may include an inner eartip body  864  that may extend between an inner eartip back end  862  and an inner eartip front end  868 , where both an inner eartip interior surface  861  of inner eartip body  864  and an opposite inner eartip exterior surface  869  of inner eartip body  864  may extend between inner eartip back end  862  and inner eartip front end  868 , and where an inner eartip space  865  may be defined by inner eartip interior surface  861  and may extend between an inner eartip back opening  863  that may be provided through inner eartip back end  862  and an inner eartip front opening  867  that may be provided through inner eartip front end  868 . Outer eartip portion  870  may include an outer eartip body  874  that may extend between an outer eartip back end  872  and an outer eartip front end  878 , where both an outer eartip interior surface  871  of outer eartip body  874  and an opposite outer eartip exterior surface  879  of outer eartip body  874  may extend between outer eartip back end  872  and outer eartip front end  878 , and where an outer eartip space  875  may be defined by outer eartip interior surface  871  (e.g., one portion of space  875  may be defined between outer eartip interior surface  871  and inner eartip exterior surface  869  when at least a portion of inner eartip body  864  is positioned between portions of outer eartip interior surface  871 , and another portion of space  875  may be occupied by inner eartip body  864  and inner eartip space  865 ) and may extend between outer eartip back end  872  and outer eartip front end  878 , while an outer eartip back opening  873  may be provided through outer eartip back end  872  and an outer eartip front opening  877  may be provided through outer eartip front end  878 . Although not shown, eartip subassembly  850  may include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150  or inner eartip internal support system  266  of eartip subassembly  250 . Additionally or alternatively, although not shown, eartip subassembly  850  may be coupled to any suitable housing subassembly and any suitable sound emitting subassembly in any suitable manner for providing any suitable earpiece for a headphone assembly. 
     Eartip subassembly  850  may include an outer eartip internal support subsystem  880  that may be operative to vary the ability of outer eartip exterior surface  879  to conform to various ear canal geometries for improving the ability of eartip subassembly  850  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  880  may be operative to vary the effective surface stiffness of eartip exterior surface  879  along a length of eartip exterior surface  879  (e.g., from outer eartip front end  878  to outer eartip back end  872 ) and/or about a perimeter of eartip exterior surface  879  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  880  may include one or more eartip internal support features, such as outer eartip internal support feature  881 . As shown in  FIGS.  29 - 31   , outer eartip internal support feature  881  may include eight fluid enclosure support components, including fluid enclosure support components  882 - 1  and  882 - 2 , although any other suitable number of fluid enclosure support components may be provided (e.g., 1, 2, 3, 7, or many more than 8). A first fluid enclosure support component  882 - 1  may include a support body  882 - lb  that may be coupled to or integrated with inner eartip exterior surface  869  in any suitable manner along any suitable path  869 - lp  on inner eartip exterior surface  869  such that at least a portion of an interior surface  882 - ii  of support body  882 - lb  and the portion of inner eartip exterior surface  869  within path  869 - lp  (i.e., inner eartip exterior surface portion  869 - 1   x ) may together define a fluid enclosure space  882 - 1   s  between inner eartip exterior surface portion  869 - 1   x  of inner eartip exterior surface  869  within path  869 - 1   p  and interior surface  882 - 1   i  of support body  882 - 1   b , and such that at least a portion of an exterior surface  882 - 1   x  of support body  882 - lb  (e.g., opposite to interior surface  882 - 1   i ) may contact or lie proximal to a portion of outer eartip interior surface  871 . Similarly, a second fluid enclosure support component  882 - 2  may include a support body  882 - 2   b  that may be coupled to or integrated with inner eartip exterior surface  869  in any suitable manner along any suitable path  869 - 2   p  on inner eartip exterior surface  869  such that at least a portion of an interior surface  882 - 2   i  of support body  882 - lb  and the portion of inner eartip exterior surface  869  within path  869 - 2   p  (i.e., inner eartip exterior surface portion  869 - 2   x ) may together define a fluid enclosure space  882 - 2   s  between inner eartip exterior surface portion  869 - 2   x  of inner eartip exterior surface  869  within path  869 - 2   p  and interior surface  882 - 2   i  of support body  882 - 2   b , and such that at least a portion of an exterior surface  882 - 2   x  of support body  882 - 2   b  (e.g., opposite to interior surface  882 - 2   i ) may contact or lie proximal to a portion of outer eartip interior surface  871 . 
     As shown, each one of the paths on inner eartip exterior surface  869  along which a support body of outer eartip internal support feature  881  is coupled may be unique and non-overlapping. For example, each one of the eight fluid enclosure space, including fluid enclosure spaces  882 - 1   s  and  882 - 2   s , may be rotationally offset from one another about a longitudinal axis by any suitable amount (e.g., by 4.5°, as may be shown in the X-Y plane of  FIG.  31    about longitudinal axis Z). Alternatively, two or more of such paths on inner eartip exterior surface  869  may overlap such that a portion of an inner eartip exterior surface portion of a first path may be the same as a portion of an inner eartip exterior surface portion of a second path. 
     The geometry of a support body of a fluid enclosure support component may be consistent or variable. For example, as shown, thickness  882 - 1   t  of support body  882 - lb  of support component  882 - i  between exterior surface  882 - 1   x  and interior surface  882 - 1   i  of support body  882 - 1   b  may be consistent along its entirety (e.g., between any two portions of support body  882 - lb  coupled to any two portions of path  869 - 1   p ). Alternatively, as shown, thickness  882 - 2   t  of support body  882 - 2   b  of support component  882 - 2  between exterior surface  882 - 2   x  and interior surface  882 - 2   i  of support body  882 - 2   b  may vary along different portions thereof. The size and shape of each fluid enclosure space defined by each fluid enclosure support component may be the same as each other, or the size and/or shape of one fluid enclosure space defined by one fluid enclosure support component may be different than that of another fluid enclosure space defined by another fluid enclosure support. A fluid enclosure space defined by a fluid enclosure support component of outer eartip internal support feature  881  may be any suitable size and/or any suitable shape. In an undeformed configuration of eartip subassembly  850  of  FIGS.  29 - 31    (e.g., the functional configuration of eartip subassembly  850  without any external forces applied thereto, such as by a user), at least a portion of an interior surface of a support body may contact outer eartip interior surface  871  or may be distanced any suitable distance from outer eartip interior surface  871 . For example, as shown, at least a portion of exterior surface  882 - 2   x  of support body  882 - 2   b  may contact outer eartip interior surface  871 . In some embodiments, such contact may be maintained by coupling exterior surface  882 - 2   x  of support body  882 - 2   b  to outer eartip interior surface  871  (e.g., with adhesive(s), mechanical fastener(s), manufacturing techniques (e.g., molding), and the like). Alternatively, as shown, a portion of exterior surface  882 - 1   x  of support body  882 - lb  may be distanced any suitable distance  882 - led  from outer eartip interior surface  871 , where such a distance  882 - led  may be small enough so as to be closed when outer eartip body  874  may receive an external force on outer eartip exterior surface  879  (e.g., by a user&#39;s ear canal) that may deform outer eartip interior surface  871  so as to push against a portion of exterior surface  882 -Ix of support body  882 - lb  (e.g., such that the shape of fluid enclosure space  882 - 1   s  may be deformed). 
     As with fluid enclosure spaces of eartip subassembly  750 , any suitable fluid may be held within a fluid enclosure space of a fluid enclosure support component in the default configuration of eartip subassembly  850 , such as any suitable gas (e.g., air), any suitable liquid (e.g., water), any combination thereof, and the like, which may be operative to deform when the shape of the fluid enclosure space deforms due to deformation of any suitable portion of the surfaces defining the fluid enclosure space. The volume of such fluid may remain constant or may vary throughout the use of eartip subassembly  850 . For example, as shown, support body  882 - lb  of fluid enclosure support component  882 - 1  may include one or more valves  882 - 1   v  that may be operative to selectively enable a fluid to enter into fluid enclosure space  882 - 1   s  and/or to exit fluid enclosure space  882 - 1   s  therethrough. 
     Additionally or alternatively, it is to be understood that any one or more of the support components of outer eartip internal support feature  881  of outer eartip internal support subsystem  880  may include one or more suitable flap portions, as described with respect to any flap portions of  FIGS.  7 - 28    (e.g., extending in any suitable direction(s) from any suitable portion of exterior surface  882 - 1   x  of support body  882 - lb  with any suitable shape (e.g., for interfacing with and/or matching a contour of outer eartip interior surface  871  (e.g., flap portion  882 - 1   fa  of support component  882 - 1 ) and/or of exterior surface  882 - 1   x  of any adjacent support body (e.g., flap portion  882 - 1   fb  of support component  882 - 1 ))). Additionally or alternatively, although not shown in  FIGS.  29 - 31   , it is to be understood that outer eartip internal support subsystem  880  may include one or more additional outer eartip internal support features along with outer eartip internal support feature  881  (e.g., a second outer eartip internal support feature positioned longitudinally above or below outer eartip internal support feature  881  along and about outer eartip body  874  and/or along and about inner eartip body  864 , such as an additional outer eartip internal support feature defining one or more additional fluid enclosure spaces that may have any suitable geometries or orientations that may be the same as or different than that of the fluid enclosure spaces of outer eartip internal support feature  881 ). 
     Any portion or the entirety eartip internal support feature  881  of outer eartip internal support subsystem  880  (e.g., support bodies and/or flap portions of eartip internal support feature  881 ) may be formed of any suitable material, which may be the same as or different than the material of inner eartip body  864  and/or outer eartip body  874 . Moreover, one or more support bodies of outer eartip internal support subsystem  880  may be coupled to inner eartip portion  860  and/or outer eartip portion  870  using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable gasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, one or more support bodies of outer eartip internal support subsystem  880  may be molded to or otherwise integrated with inner eartip portion  860  and/or outer eartip portion  870  using any suitable process (e.g., in a single or double-shot molding process). 
     
       FIGS.  32 - 34   
     
       FIGS.  32 - 34    show another illustrative earpiece  920 , which may be similar to earpiece  120  of  FIGS.  1 - 4    but may include an outer eartip internal support subsystem with at least one support component that may define a fluid enclosure coupled to or integrally formed with an interior surface of an outer eartip body for varying the effective rigidity of an exterior surface of the outer eartip body to affect the ability of the outer eartip body to conform to various ear canal geometries and for defining at least a portion of a sound path and/or for holding at least a portion of a sound emitting subassembly. Earpiece  920  of  FIGS.  32 - 34    may include similar components to earpiece  120  of  FIGS.  1 - 4   , where elements of earpiece  920  of  FIGS.  32 - 34    being labeled with “9xx” reference labels may correspond to the “1 xx” reference labels of the labeled elements of earpiece  120  of  FIGS.  1 - 4   , and where differences therebetween may be described below. As shown, earpiece  920  may include an eartip subassembly  950  that may include an outer eartip portion  970 . Outer eartip portion  970  may include an outer eartip body  974  that may extend between an outer eartip back end  972  and an outer eartip front end  978 , where both an outer eartip interior surface  971  of outer eartip body  974  and an opposite outer eartip exterior surface  979  of outer eartip body  974  may extend between outer eartip back end  972  and outer eartip front end  978 , and where an outer eartip space  975  may be defined by outer eartip interior surface  971  (e.g., space  975  may be defined between the different portions of outer eartip interior surface  971 ) and may extend between outer eartip back end  972  and outer eartip front end  978 , while an outer eartip back opening  973  may be provided through outer eartip back end  972  and an outer eartip front opening  977  may be provided through outer eartip front end  978 . Earpiece  920  may also include any suitable housing subassembly  930  and any suitable sound emitting subassembly  940  for emitting sound S through a portion of outer eartip space  975 , one or both of which may be coupled to eartip subassembly  950  in any suitable manner. Although not shown, earpiece  920  may also include any suitable inner eartip internal support system, such as inner eartip internal support system  166  of eartip subassembly  150 . Alternatively, as shown, earpiece  920  may include inner eartip internal support system  266  of eartip subassembly  250 , which may be operative to couple eartip subassembly  950  to housing subassembly  930  and/or to sound emitting subassembly  940 . However, eartip subassembly  950  may not include an inner eartip portion (e.g., like inner eartip portion  160  of eartip subassembly  1 . 50 ). Instead, a portion of an eartip internal support subsystem (e.g., an interior surface of one or more fluid enclosure support bodies coupled to or integrated with outer eartip portion  970 ) may be operative to define an inner eartip space  975   i  of outer eartip space  975  (e.g., for at least partially retaining at least a portion of housing subassembly  930  and/or at least a portion of sound emitting subassembly  940 , and/or for at least partially defining a path for sound S up towards outer eartip front opening  977 , etc.). 
     Eartip subassembly  950  may include an outer eartip internal support subsystem  980  that may be operative to vary the ability of outer eartip exterior surface  979  to conform to various ear canal geometries for improving the ability of eartip subassembly  950  to create an effective acoustic seal and/or to provide comfort to the user. Outer eartip internal support subsystem  980  may be operative to vary the effective surface stiffness of eartip exterior surface  979  along a length of eartip exterior surface  979  (e.g., from outer eartip front end  978  to outer eartip back end  972 ) and/or about a perimeter of eartip exterior surface  979  (e.g., about at least a portion of the path of sound S (e.g., about the Z-axis in an X-Y plane)). Outer eartip internal support subsystem  980  may include one or more eartip internal support features, such as outer eartip internal support feature  981 . As shown in  FIGS.  32 - 34   , outer eartip internal support feature  981  may include four fluid enclosure support components, including enclosure support components  982 - 1 ,  982 - 2 ,  982 - 3 , and  982 - 4 , although any other suitable number of fluid enclosure support components may be provided (e.g., 1, 2, 3, or many more than 4). First fluid enclosure support component  982 - 1  may include a support body  982 - lb  that may be coupled to or integrated with outer eartip interior surface  971  in any suitable manner along any suitable path  971 - lp  on outer eartip interior surface  971  such that at least a portion of an exterior surface  982 - 1   x  of support body  982 - lb  and the portion of outer eartip interior surface  971  within path  971 - lp  (i.e., outer eartip interior surface portion  971 - 1   n ) may together define a fluid enclosure space  982 - 1   s  between outer eartip interior surface portion  971 - 1   n  of outer eartip interior surface  971  within path  971 - lp  and exterior surface  982 - 1   x  of support body  982 - 1   b , and such that at least a portion of an interior surface  982 - li  of support body  982 - lb  (e.g., opposite to exterior surface  982 - 1   x ) may face inwardly for defining at least a portion of inner eartip space  975   i  of outer eartip space  975 . Similarly, second fluid enclosure support component  982 - 2  may include a support body  982 - 2   b  that may be coupled to or integrated with outer eartip interior surface  971  in any suitable manner along any suitable path  971 - 2   p  on outer eartip interior surface  971  such that at least a portion of an exterior surface  982 - 2   x  of support body  982 - 2   b  and the portion of outer eartip interior surface  971  within path  971 - 1   p  (i.e., outer eartip interior surface portion  971 - 2   n ) may together define a fluid enclosure space  982 - 2   s  between outer eartip interior surface portion  971 - 2   n  of outer eartip interior surface  971  within path  971 - 2   p  and exterior surface  982 - 2   x  of support body  982 - 2   b , and such that at least a portion of an interior surface  982 - 2   i  of support body  982 - 2   b  (e.g., opposite to exterior surface  982 - 2   x ) may face inwardly for defining at least a portion of inner eartip space  975   i  of outer eartip space  975 . Similarly, third fluid enclosure support component  982 - 3  may include a support body  982 - 3   b  that may be coupled to or integrated with outer eartip interior surface  971  in any suitable manner along any suitable path  971 - 3   p  on outer eartip interior surface  971  such that at least a portion of an exterior surface  982 - 3   x  of support body  982 - 3   b  and the portion of outer eartip interior surface  971  within path  971 - 3   p  (i.e., outer eartip interior surface portion  971 - 3   n ) may together define a fluid enclosure space  982 - 3   s  between outer eartip interior surface portion  971 - 3   n  of outer eartip interior surface  971  within path  971 - 3   p  and exterior surface  982 - 3   x  of support body  982 - 3   b , and such that at least a portion of an interior surface  982 - 3   i  of support body  982 - 3   b  (e.g., opposite to exterior surface  982 - 3   x ) may face inwardly for defining at least a portion of inner eartip space  975   i  of outer eartip space  975 . Similarly, fourth fluid enclosure support component  982 - 4  may include a support body  982 - 4   b  that may be coupled to or integrated with outer eartip interior surface  971  in any suitable manner along any suitable path  971 - 4   p  on outer eartip interior surface  971  such that at least a portion of an exterior surface  982 - 4   x  of support body  982 - 4   b  and the portion of outer eartip interior surface  971  within path  971 - 4   p  (i.e., outer eartip interior surface portion  971 - 4   n ) may together define a fluid enclosure space  982 - 4   s  between outer eartip interior surface portion  971 - 4   n  of outer eartip interior surface  971  within path  971 - 4   p  and exterior surface  982 - 4   x  of support body  982 - 4   b , and such that at least a portion of an interior surface  982 - 4   i  of support body  982 - 4   b  (e.g., opposite to exterior surface  982 - 4   x ) may face inwardly for defining at least a portion of inner eartip space  975   i  of outer eartip space  975 . 
     As shown, each one of paths  971 - 1   p  through  971 - 4   p  may be unique and non-overlapping. For example, fluid enclosure spaces  982 - 1   s  through  982 - 4   s  may be rotationally offset from one another about a longitudinal axis by any suitable amount (e.g., by 90°, as may be shown in the X-Y plane of  FIG.  34    about longitudinal axis Z). Alternatively, two or more of paths  971 - lp  through  971 - 4   p  may overlap such that a portion of an outer eartip interior surface portion of a first path may be the same as a portion of an outer eartip interior surface portion of a second path. 
     The geometry of a support body of a fluid enclosure support component may be consistent or variable. For example, as shown, thickness  982 - 1   t  of support body  982 - lb  of support component  982 - 1  between exterior surface  982 - 1   x  and interior surface  982 - li  of support body  982 - lb  may be consistent along its entirety (e.g., between any two portions of support body  982 - lb  coupled to any two portions of path  971 - 1   p ). Alternatively, as shown, thickness  982 - 2   t  of support body  982 - 2   b  of support component  982 - 2  between exterior surface  982 - 2   x  and interior surface  982 - 2   i  of support body  982 - 2   b  may vary along different portions thereof. The size and shape of each fluid enclosure space defined by each fluid enclosure support component may be the same as each other, or the size and/or shape of one fluid enclosure space defined by one fluid enclosure support component may be different than that of another fluid enclosure space defined by another fluid enclosure support. A fluid enclosure space defined by a fluid enclosure support component may be any suitable size and/or any suitable shape. In an undeformed configuration of eartip subassembly  950  of  FIGS.  32 - 34    (e.g., the functional configuration of eartip subassembly  950  without any external forces applied thereto, such as by a user), at least a portion of an interior surface of a support body may face another portion of that same interior surface or the interior surface of another support body for defining at least a portion of inner eartip space  975   i  of outer eartip space  975 . Additionally, in some embodiments, other types of support components may be provided by outer eartip internal support feature  981  of eartip internal support subsystem  980  other than a number of fluid enclosure support components. For example, as shown, any suitable number of non-fluid enclosure support components  982 - 5  through  982 - 8  may be provided, each of which may be similar to support component  682 - 1  of  FIGS.  22  and  23   , and each of which may include a free end that may be operative to define at least a portion of inner eartip space  975   i  of outer eartip space  975 . As shown, each one of non-fluid enclosure support components  982 - 5  through  982 - 8  may be rotationally offset from one another and interspersed between two particular ones of fluid enclosure support components  982 - 1  through  982 - 4 . 
     Inner eartip space  975   i , as may be at least partially defined by a portion of one or more support components, may be operative to receive and at least partially retain at least a portion of housing subassembly  930  and/or sound emitting subassembly  940  such that sound S emitted therefrom may be effectively passed through inner eartip space  975   i  and out from outer eartip front opening  977 . In some embodiments, the size and/or shape of at least a portion of inner eartip space  975   i  in its default configuration (e.g., when no external forces are being applied to eartip subassembly  9 . 50 ) may be such that at least a portion of housing subassembly  930  and/or sound emitting subassembly  940  may not fit therein, such that at least a portion of housing subassembly  930  and/or sound emitting subassembly  940  must deform one or more of the support components for deforming the size and/or shape of at least a portion of inner eartip space  975   i  from its default configuration such that housing subassembly  930  and/or sound emitting subassembly  940  may be held within inner eartip space  975   i . In some embodiments, such contact between at least a portion of the one or more support components defining inner eartip space  975   i  (e.g., interior surface  982 - ii  of support body  982 - 1   b ) and a portion of housing subassembly  930  and/or sound emitting subassembly  940  may be maintained prior to, during, and after outer eartip body  974  may receive an external force on outer eartip exterior surface  979  (e.g., by a user&#39;s ear canal) that may deform outer eartip interior surface portion  971 - ln  of outer eartip interior surface  971  within path  971 - lp  such that the shape of fluid enclosure space  982 - 1   s  may be deformed for pushing a portion of interior surface  982 - li  of support body  982 - lb  further against a portion of housing subassembly  930  and/or sound emitting subassembly  940 . In some embodiments, as shown, spring component  266   s  of internal support system  266  of eartip subassembly  250  may be provided through portions of one or more of the support bodies defining inner eartip space  975   i  of subassembly  950  (e.g., rather than through inner eartip body  264  of subassembly  250 ) and/or at least a portion of housing subassembly  930  and/or of sound emitting subassembly  940 . 
     Any suitable fluid may be held within a fluid enclosure space of a fluid enclosure support component in the default configuration of eartip subassembly  950 , such as any suitable gas (e.g., air), any suitable liquid (e.g., water), any combination thereof, and the like, which may be operative to deform when the shape of the fluid enclosure space deforms due to deformation of any suitable portion of the surfaces defining the fluid enclosure space. In some embodiments, the volume of such fluid may remain constant throughout the use of eartip subassembly  950  (e.g., the volume of such fluid in the default configuration of the fluid enclosure space may be the same as when the fluid enclosure space is deformed (e.g., when eartip subassembly  950  is positioned within a user&#39;s ear canal)). In other embodiments, the volume of such fluid may vary throughout the use of eartip subassembly  950  (e.g., fluid may be enabled to enter and exit the fluid enclosure space as the fluid enclosure space changes shapes). For example, as shown, support body  982 - lb  of fluid enclosure support component  982 - 1  may include one or more valves  982 - 1   v  that may be operative to selectively enable a fluid to enter into fluid enclosure space  982 - 1   s  and/or to exit fluid enclosure space  982 - 1   s  therethrough. 
     Additionally or alternatively, it is to be understood that any one or more of the support components of outer eartip internal support feature  981  of outer eartip internal support subsystem  980  may include one or more suitable flap portions, as described with respect to any flap portions of  FIGS.  7 - 31    (e.g., extending in any suitable direction(s) from any suitable portion of interior surface  982 - 1   i  of support body  982 - 1   b  with any suitable shape (e.g., for interfacing with and/or matching a contour of a portion of housing subassembly  930  and/or sound emitting subassembly  940  (e.g., flap portion  982 - 1   fa  of support component  982 - 1 ) and/or of a portion of an adjacent support component (e.g., support component  982 - 5  and/or support component  982 - 8  (e.g., flap portion  982 - 1   fb  of support component  982 - 1 )))). Additionally or alternatively, although not shown in  FIGS.  32 - 34   , it is to be understood that outer eartip internal support subsystem  980  may include one or more additional outer eartip internal support features along with outer eartip internal support feature  981  (e.g., a second outer eartip internal support feature positioned longitudinally above or below outer eartip internal support feature  981  along and about outer eartip body  974 , such as an additional outer eartip internal support feature defining one or more additional fluid enclosure spaces that may have any suitable geometries or orientations that may be the same as or different than that of the fluid enclosure spaces of outer eartip internal support feature  981 ). 
     Any portion or the entirety of eartip internal support feature  981  of outer eartip internal support subsystem  980  (e.g., support bodies and/or flap portions of eartip internal support feature  981 ) may be formed of any suitable material, which may be the same as or different than the material of outer eartip body  974 . Moreover, one or more support bodies of outer eartip internal support subsystem  980  may be coupled to outer eartip portion  970  using any suitable approach or mechanism, including, but not limited to, any suitable adhesive(s) (e.g., glues or tapes), any suitable gasket(s), any suitable heat staking or other heat treatment, any suitable interference fit(s), any suitable mechanical connector(s), and/or the like. Additionally or alternatively, one or more support bodies of outer eartip internal support subsystem  980  may be molded to or otherwise integrated with outer eartip portion  970  using any suitable process (e.g., in a single or double-shot molding process). 
     Further Description of  FIGS.  1 - 34     
     Therefore, independent of any geometry or material variability of an inner eartip body and/or of an outer eartip body of an eartip subassembly, any suitable inner eartip internal support subsystem (e.g., any suitable inner eartip internal support component(s) of subsystem  166  and/or subsystem  266 ) and/or any suitable outer eartip internal support subsystem (e.g., any suitable outer eartip internal support component(s) of subsystem  380 , subsystem  480 , subsystem  580 , subsystem  680 , subsystem  780 , subsystem  880 , and/or subsystem  980 ) may be operative to vary the effective rigidity of an eartip body for affecting the ability of the eartip subassembly to conform to various ear canal geometries. Different support components of one or more internal support subsystems may be positioned and configured to provide specific amounts and types of additional rigidity at specific portions of an exterior surface of an outer eartip body that may be expected to interface with specific portions of a user&#39;s ear canal geometry when the eartip subassembly is positioned within the user&#39;s ear canal (e.g., such that the eartip subassembly may be operative to conform to different bumps along the surfaces of the ear canal while maintaining an acoustic seal and while providing comfort to the user). Additionally or alternatively, at least one support component of an internal support subsystem may be positioned and configured to provide specific amounts and types of additional rigidity at specific portions of an inner eartip body defining an inner eartip space that may transmit sound to a user when the eartip subassembly is positioned within the user&#39;s ear canal (e.g., such that the eartip subassembly may be operative to ensure an effective sound path while also at least partially conforming to various ear canal geometries). 
     While there have been described headphone eartips with internal support components and methods for making the same, it is to be understood that many changes may be made therein without departing from the spirit and scope of the subject matter described herein in any way. Insubstantial changes from the claimed subject matter as viewed by a person with ordinary skill in the art, now known or later devised, are expressly contemplated as being equivalently within the scope of the claims. Therefore, obvious substitutions now or later known to one with ordinary skill in the art are defined to be within the scope of the defined elements. It is also to be understood that various directional and orientational terms, such as “up” and “down,” “front” and “back,” “exterior” and “interior,” “top” and “bottom” and “side,” “length” and “width” and “depth,” “thickness” and “diameter” and “cross-section” and “longitudinal,” “X-” and “Y-” and “Z-,” and the like may be used herein only for convenience, and that no fixed or absolute directional or orientational limitations are intended by the use of these words. 
     Therefore, those skilled in the art will appreciate that the invention can be practiced by other than the described embodiments, which are presented for purposes of illustration rather than of limitation.