Patent ID: 7748495

Claim:
An acoustic loudspeaker comprising: at least first and second loudspeaker drivers, the at least first and second loudspeaker drivers being substantially identical; and an enclosure comprising: at least one tubular sound channel of a substantially constant inside dimension acoustically coupled to the at least first and second loudspeaker drivers, wherein the at least one tubular sound channel comprises a first opening disposed at a first end of the at least one tubular sound channel, a second opening disposed at a second end of the at least one tubular sound channel and a third opening disposed on the at least one tubular sound channel between the first and second ends, wherein the first, second and third openings comprise an inner dimension which substantially corresponds to the inside dimension of the at least one tubular sound channel and the outside dimension of the at least first and second loudspeaker drivers, wherein the at least first and second loudspeaker drivers are coupled to the first and third openings, wherein the second opening comprises a sound outlet for outputting sound conducted through the at least one tubular sound channel from the at least first and second loudspeaker drivers, and at least one tuning section disposed within the at least one tubular sound channel between the second and third openings, the at least one tuning section running substantially parallel to the at least one tubular sound channel, wherein the at least one tuning section comprises an inside dimension that is less than the inside dimension of the at least one tubular sound channel.