| 摘要 |
A low frequency audio coupler (210) that produces a high sound pressure level in a listening environment. Both the front and back audio waves are used to optimize the produced sound. Three different embodiments all of which have a dual box structure. One embodiment includes an inner box (202) that may be pulled from an outer box (200) so as to tune the subwoofer. A second embodiment includes a dual box structure that directs front and back waves produced by a driver in opposite directions to create an omni-directional effect. The third embodiment includes a chute that wraps around a rear wall and side wall of the inner box so as to direct the produced back wave in the same direction as the produced front wave.
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