Patent ID: 8031895

Claim:
A driver and enclosure combination comprising a housing having a front section with first and second openings therein, a chamber including the first opening, and a passageway having a first terminal end in communication with the chamber and a second terminal end in communication with the second opening, said chamber including a driver having a front face end nearby said first opening and a rear end nearby said first terminal end of the passageway, said chamber being sealed so that air within the chamber exits said chamber substantially through the first and second openings, said driver projecting sound waves into a listening area directly through the first opening and simultaneously projecting sound waves along said passageway and out the second opening into the listening area, said passageway comprising at least one expansion zone with a predetermined maximum cross-sectional area and at least one compression zone, and said passageway terminating in a final compression zone at or nearby the second opening that has a cross-sectional area that is from 50% to 85% of said maximum cross-sectional area.