Patent Publication Number: US-10327054-B2

Title: Extendable speaker system

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The Present application is the United States National Stage of Patent Cooperation Treaty Application Number PCT/US2016/050931, filed on Sep. 9, 2016, which claims priority to U.S. Provisional patent Application No. 62/216,069 field on Sep. 9, 2015, each of which is hereby incorporated by reference in its entirety. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not Applicable 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     This invention relates to the general field of audio systems, and more specifically toward an extendable speaker system. 
     Description of the Related Art 
     Speakers are considered by many to be a necessity for a variety of social functions, ranging from tailgates to wedding ceremonies. There is a demand for an appealing, portable speaker system that can play loud music with a balanced and wide frequency response. 
     Low frequency loudspeakers, such as a woofer or subwoofer speaker, use enclosures to prevent sound waves generated by the rearward-facing surface of the diaphragm of a speaker interacting with sound waves generated at the front of the speaker. The sound waves generated by the rearward-facing surface of a speaker are out of phase with the sound waves generated by the forward-facing surface, and therefore cause distorted sound when a listener hears both sets of sound waves. The enclosure that resides behind the speaker restricts or prevents sound waves from leaving the speaker system, thereby reducing or eliminating the sound waves that are out of phase. 
     There are two general types of enclosures produced for woofer speakers. A sealed enclosure provides for an airtight enclosure that reduces if not eliminates any out-of phase sound emanating from the speaker, A ported enclosure includes an opening (or port) that enables air and sound waves to pass therethough. A sealed enclosure may provide less distortion and crisper sound, but not provide the same “thunder” or “roar” as a ported enclosure. The airtight sealed enclosure acts as a type of shock absorber that restricts large displacements of the cone of the speaker. The ported enclosure removes the shock absorber effect, but does allow some sound to escape. This out of phase sound emanating from the enclosure can lead to an overall distorted sound to the user. 
     To mitigate the effects of the shock absorbing sealed enclosure, the sealed enclosure can be made larger. A larger sealed enclosure provides for smaller pressure changes resulting from the displacement of the cone of the speaker. Smaller pressure changes in the sealed enclosure allow for a greater displacement of the cone of the speaker, while reducing or preventing out of phase sound waves from leaving the speaker system. Larger ported enclosures are also beneficial over smaller ported enclosures, as the larger ported enclosures are able to trap and dissipate the out of phase sound more effectively than smaller sized ported enclosures. 
     Providing a large enclosure for a woofer speaker results in a large, often cumbersome, unit that is difficult to transport. Smaller sealed speaker enclosures, while easier to transport, don&#39;t provide the rich, tight sound at lower frequencies. Prior art speaker systems have tried to overcome these difficulties by providing inflatable sealed enclosures, or enclosures with flexible walls. However, these systems can be easily broken (punctured), don&#39;t expand to multiple times their collapsed size, or don&#39;t provide high quality sound at a wide range of frequencies. 
     Thus there has existed a long-felt need for a speaker system that provides high quality audio with a wide frequency response, including low frequencies, that can collapse to a small size for transport and storage, and expand to multiple times its collapsed size to provide a larger speaker enclosure. 
     BRIEF SUMMARY OF THE INVENTION 
     An extendable speaker system is provided with a base and lid that are connected via a plurality of concentric collapsible hollow bodies such as cylinders. A woofer speaker resides in the base. Mid range or tweeter speakers reside in the lid. The lid is displaced away from the base to expand the speaker system, where the extended cylinders provide an airtight seal between the base and lid forming a woofer speaker enclosure therein. Friction seals between the cylinders, a spring residing within the speaker enclosure, and the airtight speaker enclosure itself provide a collective force sufficient to maintain the speaker system in an extended configuration. A port is opened by depressing a button to vent the enclosure to allow for the speaker system to be collapsed. A locking system is provided to releasably maintain the speaker system in a collapsed configuration. 
     The current invention provides just such a solution by having an extendable speaker system with a base and lid that are connected via a plurality of concentric collapsible hollow bodies such as cylinders. A woofer speaker resides in the base. Mid range or tweeter speakers reside in the lid. The lid is displaced away from the base to expand the speaker system, where the extended cylinders provide an airtight seal between the base and lid forming a woofer speaker enclosure therein. Friction seals between the cylinders, a spring residing within the speaker enclosure, and the airtight speaker enclosure itself provide a collective force sufficient to maintain the speaker system in an extended configuration. A port is opened by depressing a button to vent the enclosure to allow for the speaker system to be collapsed. A locking system is provided to releasably maintain the speaker system in a collapsed configuration. 
     It is an object of the invention to provide an extendable and expandable speaker system that expands to multiple times its collapsed size. 
     It is another object of the invention to provide an extendable speaker system with a sealed enclosure for a woofer speaker. 
     It is a further object of this invention to provide extendable speaker system that produces high quality audio over a wide range of frequencies, including low frequencies. 
     A particular embodiment of the current disclosure is an extendable speaker system comprising a base, a lid, and a plurality of concentric collapsible hollow bodies; where the base comprises a speaker; where the lid comprises a plurality of speakers; where the plurality of concentric collapsible hollow bodies form an enclosure above the speaker of the base and beneath the lid; where the plurality of concentric hollow bodies is extendable to separate the lid from the base thereby providing for an extended configuration, and where the plurality of concentric hollow bodies is collapsible to unite the lid with the base thereby providing for a collapsed configuration. The plurality of concentric hollow bodies is a plurality of concentric cylinders. Each of the plurality of concentric hollow bodies is a rigid body. The enclosure is a sealed enclosure. The base comprises a plurality of magnets, wherein the lid comprises a plurality of magnets, where the plurality of magnets for the base mate with the plurality of magnets of the lid when the extendable speaker system is in a collapsed configuration. The speaker of the base is a speaker with a diameter of at least four inches. The speaker of the base faces downward. The base comprises a plurality of holes. The lid comprises a plurality of holes. Each of the plurality of speakers of the lid have a diameter of two inches or less. Each of the plurality of speakers of the lid has an upward angle of between ten degrees and thirty degrees, inclusive, from the horizontal. Each of the plurality of speakers of the lid are offset by ninety degrees from each other. The lid comprises an interface for interacting with the speaker system. Each of the plurality of hollow bodies has a lower external diameter and an upper external diameter, where the lower external diameter of each hollow body is greater than the upper external diameter of that same hollow body. The extendable speaker system further comprises a spring, where the spring is within the enclosure. One end of the spring is attached to the base, and where the other end of the spring is attached to the lid. The extendable speaker system further comprises a cable, where the cable is within the enclosure, and where the cable extends from the base to the lid. The cable is attached to the spring at multiple locations. The lid further comprises a port, where the port provides fluid access through the lid to the enclosure. The lid further comprises a button, shaft, spring, and flange, where the button extends beyond a top surface of the lid, where the shaft is secured to the button on a first end, where the flange is secured to the shaft on a second end, where the spring surrounds the shaft, and where the flange releasably seals the port. 
     Another embodiment of the current disclosure is an extendable speaker system comprising a base, a lid, and a plurality of concentric collapsible hollow bodies, and a spring; where the base comprises a speaker; where the lid comprises a speaker and a port, where the port provides fluid access through the lid to the enclosure; where the plurality of concentric collapsible hollow bodies form a sealed enclosure above the speaker of the base and beneath the lid, where the spring is within the enclosure, and where each of the plurality of concentric hollow bodies is a rigid body; and where the plurality of concentric hollow bodies is extendable to separate the lid from the base thereby providing for an extended configuration, and where the plurality of concentric hollow bodies is collapsible to unite the lid with the base thereby providing for a collapsed configuration. The plurality of concentric hollow bodies is a plurality of concentric cylinders. Each of the plurality of concentric hollow bodies comprises a lower lip and an upper lip, where the lower lip of each of the plurality of concentric hollow bodies extends outward, and where the upper lip of each of the plurality of concentric hollow bodies extends inward. The base comprises a plurality of magnets, wherein the lid comprises a plurality of magnets, where the plurality of magnets for the base mate with the plurality of magnets of the lid when the extendable speaker system is in a collapsed configuration. The base comprises a plurality of holes. The lid comprises a plurality of holes. Each of the plurality of hollow bodies has a lower external diameter and an upper external diameter, where the lower external diameter of each hollow body is greater than the upper external diameter of that same hollow body. One end of the spring is attached to the base, and where the other end of the spring is attached to the lid. The extendable speaker system further comprises a cable, where the cable is within the enclosure, and where the cable extends from the base to the lid. The cable is attached to the spring at multiple locations. The lid further comprises a button, shaft, spring, and flange, where the button extends beyond a top surface of the lid, where the shaft is secured to the button on a first end, where the flange is secured to the shaft on a second end, where the spring surrounds the shaft, and where the flange releasably seals the port. 
     Having briefly described the present invention, the above and further objects, features and advantages thereof will be recognized by those skilled in the pertinent art from the following detailed description of the invention when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a perspective view of the speaker system in an extended configuration according to select embodiments of the current disclosure. 
         FIG. 2  is a side view of the speaker system in an extended configuration according to select embodiments of the current disclosure. 
         FIG. 3  is a side view of the speaker system in a collapsed configuration according to selected embodiments of the current disclosure. 
         FIG. 4  is a cutaway front view of a top portion of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 5  is a cutaway top view of the lid of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 6  is a partial cutaway side view of the lid of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 7  is a perspective view of the lid of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 8  is a perspective view, opposite of that in  FIG. 7 , of the lid of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 9  is a cutaway side view of the lid of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 10  is a cutaway side perspective view of the innermost cylinder and base of the lid of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 11  is a semi-transparent side view of the speaker system in an extended configuration according to selected embodiments of the current disclosure. 
         FIG. 12  is a partial cutaway side view of two cylinders of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 13  is a semi-transparent partial side perspective view of the lower portion of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 14  is a semi-transparent side view of the lower portion of the base of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 15  is semi-transparent side view of the lower portion of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 16  is a semi-transparent side view of the lid and cylinders of the speaker system in an extended configuration according to selected embodiments of the current disclosure. 
         FIG. 17  is a lower perspective view of the lid and innermost cylinder of the speaker system in an extended configuration according to selected embodiments of the current disclosure. 
         FIG. 18  is a perspective view of a portion of the base and outermost cylinder of the speaker system in an extended configuration according to selected embodiments of the current disclosure. 
         FIG. 19  is a perspective view of the speaker system in a collapsed configuration according to selected embodiments of the current disclosure. 
         FIG. 20  is a semi-transparent partial cutaway side view of a lower portion of the speaker system in an extended configuration according to selected embodiments of the current disclosure. 
         FIG. 21  is a partially semi-transparent side view of the speaker system in an extended configuration according to selected embodiments of the current disclosure. 
         FIG. 22  is a semi-transparent view of the speaker system with a luggage extension mechanism according to selected embodiments of the current disclosure. 
         FIG. 23  is a flow chart showing the interactions of various electronic components of the speaker system according to selected embodiments of the current disclosure. 
         FIG. 24  is a semi-transparent partial side view of the luggage extension locking mechanism according to selected embodiments of the current disclosure. 
         FIG. 25  is an exploded perspective view of a locking mechanism according to selected embodiments of the current disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  is a perspective view of the speaker system in an extended configuration according to select embodiments of the current disclosure. The speaker system  10  has a lid  30  and base  20 . A plurality of concentric collapsible hollow bodies, in this instance coaxially aligned cylinders  15 , connects the lid  30  to the base  20 . In this view, there are four cylinders  15  shown in an extended configuration. The lid  30  includes a handle  32  for carrying and extending/collapsing the speaker system  10 . A mobile phone  99  is shown resting in a phone slot  33 . Controls for interacting with the speaker system  10  are provided through an interface  31 , such as a power button and volume up and down buttons. 
       FIG. 2  is a side view of the speaker system in an extended configuration according to select embodiments of the current disclosure.  FIG. 3  is a side view of the speaker system in a collapsed configuration according to selected embodiments of the current disclosure. The speaker system has an extended height  11  of thirty-three inches (33″) tall and a collapsed height  12  of eleven inches (1″). Its largest outer diameter  13  is seven and one-half inches (7.5″) where in an extended or collapsed configuration. The lid  30  is two inches (2″) tall when viewed from the outside. 
       FIG. 4  is a cutaway front view of a top portion of the speaker system according to selected embodiments of the current disclosure. There are two two-inch (2″) mid range speakers  34  inside the lid  30 . Drivers of this size are fairly inexpensive and together can reach ninety decibels (90 dB). Mid-range speakers of this size typically have a frequency range from three-hundred hertz (300 Hz) to twenty kilohertz (20 kHz). Sound emanating from the mid range speakers  34  may pass through holes  35  in the outer portion of the lid  30 . A handle  32  extends from the top of the lid  30 . An air-seal button  38 , discussed in more detail below, extends at least partially through the top surface of the lid  30 . Each mid range speaker  34  is secured to a mid range speaker enclosure  43 . The enclosure  43 , in this particular embodiment a sealed enclosure, performs a similar function to the enclosure for the woofer speaker; however, it can be significantly smaller because of the higher minimum frequencies produced by the mid-range speakers. 
       FIG. 5  is a cutaway top view of the lid of the speaker system according to selected embodiments of the current disclosure. The mid range speakers  34  have a horizontal offset  37  if ninety degrees (90°) relative to each other. This orientation gives the mid range speakers  34  more directionality while still being able to cover a very large field. In this configuration, the mid range speakers can easily cover a two-hundred-ten degree (210°) field loudly. 
     Low frequency sounds emitted by the woofer speaker are generally omni-directional; the listener is often unable to discern what direction the low-frequency sound is coming from. 
     Therefore, having a single woofer speaker is sufficient. However, the middle and high frequency sounds emitted by the mid range speakers are more directional. The middle and high frequencies are separated from the low frequencies. The middle and high frequencies are only sent to the elevated mid range speakers. A stereo effect is achieved by providing a left channel to one speaker (the left speaker), and a right channel to another speaker (the right speaker). Baffles in the lid may be used to help separate the sounds emanating from each speaker to help increase the stereo effect, A switch is integrated into the lid to enable users to select between stereo and mono sound. When the switch selects stereo sound, left and right audio channels are sent to the left and right mid range speakers, respectively. When the switch selects mono sound, the left and right audio channels are combined, and the combined signal is sent to each mid range speaker. The switch may be selected by various means, including a mechanical switch such as a toggle switch or button, a remote control, or an app on a smart phone. In this manner, a user may select whether stereo or mono sound is emitted from the speaker system. 
       FIG. 6  is a partial cutaway side view of the lid of the speaker system according to selected embodiments of the current disclosure. The mid range speakers  34  have an upward angle  36  eighteen degrees (18°) from the horizontal such that sound emanating from the mid range speakers is aimed up toward the listener&#39;s ears, though angles of between ten degrees (10°) and thirty degrees (30°), inclusive, are contemplated. This configuration allows sufficient volume from the mid range speakers  34  to reach the ear of the listener without the speaker system needing to be six feet tall. 
       FIG. 7  is a perspective view of the lid of the speaker system according to selected embodiments of the current disclosure.  FIG. 8  is a perspective view, opposite of that in  FIG. 7 , of the lid of the speaker system according to selected embodiments of the current disclosure. The handle raises six-tenths of an inch ( 6/10″) above the top surface of the lid  30 . The phone slot  33  is shown angled towards the interface  31 , which is towards the front of the speaker system. These elements help indicate the orientation of the speaker system to enable users to direct the speaker system towards its intended audience. The lid  30  has holes  35  around its outer surface to allow for sound to pass therethrough. There should be a sufficient number of holes  35  to provide an open area for sound to escape, while using smaller holes  35  so that no large objects can penetrate the lid  30 , An air-seal button  38  protrudes at least partially through the top surface of the lid  30 , and is discussed in more detail below. 
       FIG. 9  is a cutaway side view of the lid of the speaker system according to selected embodiments of the current disclosure. The air-seal button  38  seals (or unseals) the cylinder enclosure. The air-seal button  38  extends beyond the top surface of the lid  30 , The air-seal button  38  is connected to a shaft  41 . Around the shaft  41  is a spring  39 . A flange  42  is affixed at the opposite end of the shaft  41  from the air-seal button  38 . The flange  42  seals the cylinder enclosure by closing a port that connects the cylinder enclosure with the inner compartment of the lid  30 . When the air-seal button  38  is depressed, the flange  42  uncovers the port thereby allowing air to pass therethrough. 
     The cylinder enclosure, when the speaker system is in an extended configuration, is a sealed enclosure for a woofer or subwoofer speaker, discussed in more detail below. The air-seal button enables the cylinder enclosure to releasably vent. This is important not only for sound quality (sealed enclosure), but also to lock the system in its extended configuration. The air-seal button extends into the enclosure space below the lid and through a small hole or port into the cylinder enclosure. When the button is not pressed, the port is sealed by the flange due to the spring force. This will allow for higher quality audio performance by having a tight seal. When the button is depressed, the hole in the lid will not be sealed and therefore open the enclosure to air. This allows for air to escape the enclosure when collapsing the system. 
       FIG. 10  is a cutaway side perspective view of the innermost cylinder and base of the lid of the speaker system according to selected embodiments of the current disclosure. In order to create more space within the lid while simultaneously making the lid shorter, the new lid portion extends down into the first cylinder. The lower extension is necessary because the mid range speakers are about two inches to three inches at their largest diameter. With an outer lid portion that is two inches tall, there would be insufficient space for the speakers. There would also be no room for a phone slot without the base of the lid extending downwards below the lowermost point of the outer surface of the lid. Furthermore, the lower extension also allows for the mid range speakers to be tilted upward at eighteen degrees (18°), as discussed above, and not have the sound emanating from these speakers reflect off the top of the lid. The base of the lid  52  extends downwards into the innermost cylinder  50  and mates with a lip  51 . The lip  51  supports the bottom of the base of the lid  52 . 
       FIG. 11  is a semi-transparent side view of the speaker system in an extended configuration according to selected embodiments of the current disclosure. The extension mechanism uses a combination of friction between concentric cylinders  15  and a spring  16 . The extension mechanism allows for the system to extend to a height that is many times the height of its collapsed configuration. Four concentric cylinders  5  are used to provide a rigid enclosure behind the woofer. The cylinders  15  are made of durable rigid plastic so that sound quality, cost and durability are all satisfied. In a particular embodiment, the nominal diameters of these cylinders  15  are about six inches (6″). The four cylinders  15  are located between the base  20  and the lid  30 . A spring  16  resides within the space provided for by the four cylinders  15 . The spring  16  applies a force to the speaker system  10  that pushes the lid  30  away from the base  20 . As the speaker system  10  is collapsed, where the lid  30  is displaced towards the base  20 , the force applied by the spring  16  increases. Furthermore, as the speaker system  10  is collapsed, the concentric cylinders  15  slide within one another. 
     The spring  16  serves multiple functions of self-lifting (outward force between the lid  30  and the base  20 ), aid in locking, and aligning the speaker system  10 . The compressed force of the spring  16 , in a particular embodiment, provides seven pounds (7 lbs) of force, which is able to self-extend the speaker system  10 , at least partially. The spring  16  helps to lock the speaker system in an extended configuration by providing, in a particular embodiment, three pounds (3 lbs) of force upwards on the lid after fully extended. Modifying the force of the spring  16  is contemplated to provide either more force or less, thereby making the system easier or more difficult to expand or collapse. The spring  16  is able to slightly rotate, but resists over rotation, which allows for lock/unlocking by minor rotation using magnet locks (described in more detail below), a natural alignment, and no over rotation of wires. Particular embodiments provide for a spring that is about one-eight of an inch (⅛″) thick and has eight coils. The diameter of the spring matches the size of the cylinders so that there is no buckling. The spring is made of common spring metals, such as steel, copper, bronze, and titanium. The spring  16  attaches to the base of the lid  30  at one end and the woofer plate (not shown) within the base  20  on the other. 
     In another embodiment, the speaker system is provided without a spring within the concentric cylinders enclosure. Such an embodiment relies on the friction seals between each cylinder as well as the internal pressure of the sealed system to maintain the speaker system in an extended configuration. 
       FIG. 12  is a partial cutaway side view of two cylinders of the speaker system according to selected embodiments of the current disclosure. Friction between the cylinders is used to seal the sides of the enclosure. Each cylinder end will slightly increase in diameter in order to create a friction seal with the next cylinder. In other words, the lower diameter  62  of each cylinder is greater than its upper diameter  63 , All cylinders will also have a small lower lip  60  and an upper lip  61  to prevent any cylinders from sliding past one another. When the speaker system is in an extended configuration, the lower lip  60  of one cylinder mates with the upper lip  61  of an adjacent cylinder, thereby preventing further extension of the cylinders. In a particular embodiment, there is an external slant or angle  64  of around two degrees (2°). 
       FIG. 13  is a semi-transparent partial side perspective view of the lower portion of the speaker system according to selected embodiments of the current disclosure. A four inch (4″) woofer  21  faces downward, where the volumetric space within the cylinders  15  act as its enclosure. When the speaker system is in the extended configuration, the woofer  21  is raised up by four and one-half inches (4.5″) as compared to when the speaker system is in the collapsed configuration, in order to raise it above holes  29  in the base housing so that sound can escape. A spring  16  is shown extending upwards from the woofer  21 . This end of the spring  16  is secured to the woofer plate (not clearly shown in this figure). 
     Woofers with a diameter of around four inches (4″) can have frequency responses from 50 Hz to 2 kHz, are widely available and relatively inexpensive. These speakers are also much lighter than larger diameter woofers. A typical weight is about one-half (½) to two (2) pounds. The smaller diameter also allows for the speaker system to be much thinner, and allows for a speaker system with a cross-sectional diameter of seven and one-half inches (7.5″). Subwoofer speakers, which will have a lower frequency response, may be used in place of the woofer speaker; however subwoofer speakers are generally larger in size and would require a larger diameter speaker system. 
       FIG. 14  is a semi-transparent side view of the lower portion of the base of the speaker system according to selected embodiments of the current disclosure. The electronics compartment located in the lower portion of the base is less than two inches (2″) tall in order to make the collapsed system shorter. If a height of two inches for the electronics compartment  40  does not include enough volume for the electronic components, then the space can be extended. However this increase in height of the electronics compartment will in turn increase the collapsed height of the system. The electronics compartment holds electrical systems including without limitation batteries, an audio amplifier, and a passive crossover. The batteries, depending on their shape and size, may have to be laid on their sides in order to fit. A crossover of 300 Hz is proposed due to the ability of the mid range speakers&#39; frequency response. Wires from the electronic components that lead to other portions of the speaker system, such as the mid-range speakers, interface, and audio connection, exit through a wire entrance  23  (labeled as a wire exit in this figure). A plurality of feet  45  are affixed to the bottom of the base to at least slightly elevate the speaker system above whatever surface it rests upon. 
       FIG. 15  is semi-transparent side view of the lower portion of the speaker system according to selected embodiments of the current disclosure. A tube  22  protruding from the electronic compartment  40  will guide wires into the cylinder enclosure above. The woofer is attached to a woofer plate  25  and slides upward and downward along the length of the tube  22  in order to be lifted and lowered. Wires travel from the electronics compartment  40  to other sections of the speaker system through the wire tube  22 . Wires enter the wire tube  22  from the electronics compartment through a wire entrance  24 . Wires then exit through the top of the wire tube  22  through a wire exit  23 . Above the wire tube  22 , two wires will run to the woofer. Other wires need to be guided to the lid for the user interface and mid ranges. These wires are wrapped together as a cable, discussed in more detail below. 
       FIG. 16  is a semi-transparent side view of the lid and cylinders of the speaker system in an extended configuration according to selected embodiments of the current disclosure. Wires that leave the wire tube of the base are wrapped together to form a single cable  17 . The cable  17  follows a helical pattern within the cylinders  15  up to the lid  30 . The cable will attach to the spring  16  in various places in order to follow a helical path that will not become tangled or obstruct anything. As the spring  6  compresses, the cable  17  will also compress with it. As the spring  16  extends, the cable  17  will also extend. 
       FIG. 17  is a lower perspective view of the lid and innermost cylinder of the speaker system in an extended configuration according to selected embodiments of the current disclosure.  FIG. 18  is a perspective view of a portion of the base and outermost cylinder of the speaker system in an extended configuration according to selected embodiments of the current disclosure.  FIG. 19  is a perspective view of the speaker system in a collapsed configuration according to selected embodiments of the current disclosure. A locking mechanism is used to maintain the speaker system in a collapsed configuration; otherwise the force of the spring may cause the speaker system to expand. The lock keeps the lid  30  attached to the base (not shown in this figure) when the system is in its collapsed state. This lock uses sixteen (16) magnets. Using magnets makes engaging the lock very easy. It is also simple and inexpensive to incorporate into the speaker system. Magnets  43  are placed around the bottom of the lid  30 , Magnets  26  are also placed around the top of the base  20 . The magnets  43  of the lid  30  mate with the magnets  26  of the base  20 . If the speaker system as a whole is spun, the magnets  43  of the lid  30  and the magnets  26  of the base  20  do not disengage and the speaker system remains locked since the entire speaker system spins together. To disengage the locks and displace the magnets  43  of the lid  30  from the magnets  26  of the base  20 , a user places the speaker system on a surface, such as the floor, and rotates or spins the lid  30 . Since the base  20  is in contact with the floor, frictional forces between the base  20  and the floor restrict rotational movement. This allows the lid  30  magnets  43  and base  20  magnets  26  to overcome their attractive forces and come out of alignment. Note that without any external forces acting upon the speaker system, the magnets  43  and magnets  26  are naturally aligned due to the alignment of the spring within the cylinders  15 . Therefore, to engage the base  20  magnets  26  and lid  30  magnets  43  and lock the speaker system, the user applies a downward force on the lid  30  until the lid  30  and base  20 , and therefore the lid  30  magnets  43  and base  20  magnets  26 , mate together. The speaker system locked in a collapsed configuration is shown in  FIG. 19 . 
     While the spring alone may be sufficient to maintain rotational alignment of the speaker system, lips may be incorporated into the cylinders, base, and lid to allow only a limited amount of rotation. Over rotation of the speaker system can result in inelastic deformation of the spring, where the spring is permanently damaged. Thus, it may be desirable to implement physical limitations to prevent over rotation of the speaker system. For example, a lip from the innermost cylinder can mate with the lip from the lid once the lid has been rotated a sufficient amount relative to the base. After the lips mate, further rotation is prevented. A similar mechanism may be incorporated between the outermost cylinder and the base. In this fashion, over rotation of the speaker system, which could potentially damage the spring through inelastic deformation, can he avoided. 
       FIG. 20  is a semi-transparent partial cutaway side view of a lower portion of the speaker system in an extended configuration according to selected embodiments of the current disclosure. As discussed above, the woofer  21  is raised upward as the speaker system is transitioned into an extended configuration to allow sound emanating from the woofer  21  to travel through holes in the base  20 . A magnetic locking system, similar to that between the base and lid, holds the woofer plate up so that it is above the air holes in the base  20 . In a particular embodiment, it holds the woofer plate four and one-half inches (4.5″) above the electronics compartment of the base. Sixteen (16) magnets are provided, eight (8) magnets  27  secured to the woofer plate, and eight (8) magnets secured to the base  20 . The magnetic lock between the woofer and base is easily engaged simply by lifting the speaker system into an extended configuration. This is a stable lock that is not likely disengage unless a relatively large force is exerted downward. Since the woofer plate slides up and down a wire tube, the plate cannot spin as the lid can. Therefore, disengaging this lock requires a downward force large enough to overcome the force applied by the magnets. This force is applied when the cylinders have all been collapsed as the speaker system is transitioned into a collapsed configuration. The magnetic force must be strong enough so that it will not allow the woofer to fall accidentally, but also not too strong to prevent its intentional disengagement. 
       FIG. 21  is a partially semi-transparent side view of the speaker system in an extended configuration according to selected embodiments of the current disclosure. Maintaining the system in its extended configuration, also referred to as extended state, is important since it must remain extended for long periods of time and might be leaned on by users. Three elements of the speaker system are used to maintain the speaker system in an extended configuration. As stated previously, the cylinders  15  provide a friction lock near the ends of each cylinder  15  that in effect provides a force  72  that resists movement. Also previously stated, the spring  16  provides a force  71  upwards in order to maintain extension. Both of these locks may be insufficient alone, or even in combination, because if a relatively significant amount of force is applied downward, these locks may disengage and accidentally cause the speaker system to collapse. A third lock that helps maintain the speaker system in an extended configuration is the sealed enclosure used by the woofer. By sealing the enclosure, air is prevented (or at least substantially restricted) from leaving. As a force is applied downward on the speaker system, the volume of the enclosure within the cylinders would necessarily decrease. However, since the enclosure is sealed between the cylinders and between the cylinders and base and lid, the decrease in volume also results in an increase in pressure within the enclosure. This increased pressure provides a restorative force  73  and acts to push the lid  30  away from the base  20 . Since a perfect seal may not be possible, small amounts of air may be able to leak out of or into the enclosure when a force is applied. The other locking mechanisms help account for this imperfection. As discussed above, the air-seal button opens a port that provides fluid access between the enclosure within the cylinders and the environment. Thus, to collapse the speaker system and disengage the sealed enclosure lock, the air-seal button is depressed which allows air with the enclosure to escape as the speaker system is collapsed. Likewise, the air-seal button is depressed when extending the speaker system to allow air to enter the enclosure. 
     Particular embodiments of the current disclosure provide for a speaker system with a weight less than ten pounds (10 lbs.) due to smaller speakers and a thinner and smaller housing. 
     The embodiments herein have been shown using concentric collapsing cylinders: however, other cross-sectional shapes other than circles are possible, including without limitation triangles, squares, pentagons, trapezoids, and even irregular polygon or irregular curved shapes. 
     The bottom enclosure, or base  120 , will include one subwoofer  121 , six lithium-ion battery cells, and a passive crossover rigidly mounted inside an electronics compartment  140  of the base  120 . The cylinders  115  when expanded will provide the volume behind the subwoofer  121  as the subwoofer  121  will be oriented downward. The top enclosure inside the lid  130  will house the tweeters  134  (speakers). An auxiliary input cable for audio input  119  will pull out from the outside of the lid  130 , connecting into a headphone jack of an audio player. A power button is also present on the lid  130  of the system. The volume of the audio playback of the speaker system  100  is controlled on the user&#39;s phone or other music-playing device. The wires mn through the mechanical component of the system and integrate with the collapsing and extending mechanism through an aluminum tube that runs from the electronic components to the top of the base  120 . This tube confines the wires to prevent them from getting tangled inside the system. 
       FIG. 22  is a semi-transparent view of the speaker system with a luggage extension mechanism according to selected embodiments of the current disclosure. Instead of a spring within the concentric cylinders, an extension mechanism, similar to what is commonly used in luggage, is incorporated into the speaker system. When collapsed, the speaker system  100  will be similar to the size of a large paint can. There will be a handle  132  on the lid  130  for the user to press down on a release button  138  and lift the handle  132  upward. The user may then pull and extend the lid  130  upward via telescopic tubing  139 , also referred to as luggage extensions mechanism, and concentric cylinders  1   15 . The telescopic tubing  139  will lock into place using lock pins mimicking the functionality of an extending suitcase handle. The user may compress the button  138  on the handle  132  to lower the speaker to its collapsed height and the lock pins will hold the two enclosures together. 
     When in a collapsed configuration, a lift force is applied by the user through the handle located on the lid. This force is transmitted through the pin lock mechanism to the base section so that the speaker system can be carried as a whole. The force that the latching mechanism must support will be the weight of the base section. The force is transferred via an internal steel pin. 
       FIG. 23  is a flow chart showing the interactions of various electronic components of the speaker system according to selected embodiments of the current disclosure. A series of battery packs  173  will power the amplifier  174 , the mid range or tweeter speakers  134 , the woofer  121 , and other electronic components such as the power button. The batteries  1   73 , amplifier  1   74 , and crossover  175  are stationed in the bottom of the base section, and the electronics compartment. The subwoofer  121  will be placed in the top of the base facing downward. Fourteen (14) gauge copper speaker wires will connect the electronics, subwoofer and mid range speakers in the lid with the power supply in the base. The cables will be managed through a square aluminum tube attached to the aluminum plate at the base and extending upward to the top of the bottom enclosure. The wires will mn from the electronic components through the aluminum tube up past the woofer to prevent the wires tangling or getting caught when the extension mechanism is raised and lowered. Two mid-range speakers will be mounted in the center of the lid oppositely faced with small square enclosures behind them. The woofer will have a frequency response between 20 Hz and 4500 Hz. The tweeters will have a frequency response between 2000 Hz and 20 kHz. A passive crossover,  175 , which consists of a high pass filter and low pass filter will be used to prevent lower and higher frequencies from being sent to the tweeter  134  and woofer  121 , respectively. A class D amplifier  174  will be used to amplify the audio signal. The audio signal will be supplied by a three and one-half millimeter (3.5 mm) auxiliary cable  119 , which plugs in to the headphone port of most electronic devices. Input power  171  is supplied to a battery-charger  172 , which in turn provides power to and charges a batter pack  73 . 
       FIG. 24  is a semi-transparent partial side view of the luggage extension locking mechanism according to selected embodiments of the current disclosure. A pin  183  extends through both the inner luggage tube  181  and outer luggage tube  82 , thereby preventing one to slide relative to the other. Forces that are incident upon either tube are transferred through the pin to the other tube. For example, a carrying force  155  is transferred trough the pin to provide a support force  156  restricting the tubes from sliding relative to teach other. Therefore, the pin  183  must be able to support the force applied to either tube. 
     Embodiments of the speaker system will collapse and extend with the use of telescopic tubes and lock pins similar to the design of retractable luggage handles. The button on the handle will disengage and engage the lock pins in place. This design will be housed in four telescopic cylinders with an outside diameter of eight and one-quarter inches (8.25″). When collapsed, the tubing and cylinders will fit within one another inside the top enclosure within the base section. 
       FIG. 25  is an exploded perspective view of a locking mechanism according to selected embodiments of the current disclosure. The female housing  187  and male housing  186  form the closed housing for the lock pin components. The lock pin components include the pin  183 , spring  184 , and push mechanism  185 . 
     Certain embodiments of the speaker system disclosed herein teach using a wired connection, such as a three and one-half millimeter (3.5 mm) connector, to provide an input audio signal to the speaker system. Nonetheless, other means of wired connection as well as wireless connections are possible without departing from the scope of the current disclosure. Wireless connections, such as those specified by the Bluetooth protocol, can be used in addition to or in place of a wired audio connection. 
     Embodiments of the speaker system with a luggage extension mechanism are held in an extended configuration using locking pins within the luggage extension mechanism. Thus, a sealed enclosure is not required to provide a force to resist compression of the enclosure. Nonetheless, a sealed enclosure for the woofer may be preferable and implemented to provide the desired audio profile. Alternatively, a ported enclosure may be implemented, whereby the enclosure is in fluid connection with the environment. Particular embodiments of the current disclosure require a durable and water resistant enclosure. To meet these requirements, the enclosure is made out of a combination of aluminum and PVC plastic. 
     From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes modification and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claim. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.