Patent ID: 8064627

Claim:
An acoustic system for accurately reproducing sound, comprising: a driver including an actuator and a diaphragm wherein the actuator oscillates the diaphragm to produce a plurality of bidirectional pressure waves having a range of amplitudes and a range of higher and lower frequencies, wherein said driver is selected from the group consisting of 8 cm class, 3 inch class and 3.3 inch class drivers; an enclosure supporting said driver and having an inner opening such that some of the pressure waves produced by the driver are directed through the enclosure and out of the inner opening, the inner opening having a select cross-sectional area of greater than 0.65 to about 1.3 times the cross-sectional area of the region defined by the outer periphery of the diaphragm such that the pressure of the pressure waves having lower frequencies is preserved; and a passage extending from the inner opening of the enclosure and terminating at an outer opening such that the pressure waves having lower frequencies are directed from the inner opening, through the passage, and out of the outer opening, the outer opening defining a cross-sectional area of about 8 to about 12 times the cross-sectional area of the inner opening such that the amplitudes of the pressure waves corresponding to the lower frequencies are amplified, said passage continuously increasing in cross-sectional area and spanning from about 1.5 meters to about 2.8 meters in length.