Patent ID: 6504938
Filing Date: 2003-01-07
Classification: H04R

Abstract:
A loudspeaker comprising:a housing having a partition therein defining a front chamber and a back chamber, both chambers being pneumatically sealed from the outside environment; a driver secured to said partition and in pneumatic and acoustic communication between said front and back chambers; a drone cone in pneumatic and acoustic communication between said front chamber and the outside environment; and, a vent in pneumatic and acoustic communication between said front and back chambers, said vent includes: a hollow elongated cylinder; and a hollow concentric cylinder encircling at least a portion of said elongated cylinder defining a gap therebetween; wherein air can travel between said front and rear chambers by traveling through said elongated cylinder, said concentric cylinder and said gap, and wherein the resonance frequency of each said chamber may be tuned by adjusting the length and size of said elongated cylinder and said concentric cylinder.