Patent ID: 8594351

Claim:
An earphone comprising: an acoustic transducer; and a housing enclosing the acoustic transducer, wherein a first side of the acoustic transducer and a first region of the housing define a first acoustic chamber including a first reactive port and a first resistive port in a parallel configuration to couple the first chamber with space outside the earphone, the first reactive port comprising an elongated tube, a first opening of the tube being open to the first acoustic chamber, and the second opening of the tube acoustically coupled to space outside the earphone, wherein the first reactive port produces an acoustical reactive effect in the frequency response of the earphone that is greater than any acoustical resistive effect produced by the first reactive port in the frequency response over a frequency range of at least between 30 Hz and 100 Hz as measured in the ear canal; the first resistive port comprising an opening in the housing and acoustically coupled to both the first acoustic chamber and space outside the earphone, the opening covered by a material providing an acoustic resistance; a second side of the acoustic transducer and a second region of the housing define a second acoustic chamber separated from the first acoustic chamber by the acoustic transducer and including: a second resistive port to couple the second acoustic chamber space outside the earphone other than at a wearer's ear canal and a nozzle having an opening coupling the second acoustic chamber to the wearer's ear canal, the second resistive port comprising an opening in the housing acoustically coupled to both the second acoustic chamber and space outside the earphone, the opening covered by a material providing an acoustic resistance; the second acoustic chamber is located at least partially in the concha of the wearer's ear, the nozzle extends the second acoustic chamber at least partially into the ear canal of the wearer's ear, and the nozzle includes an acoustically resistive element in the opening coupling the second acoustic chamber to the wearer's ear canal.