| 摘要 |
The enclosure (10) has concentric cylindrical structures (20,30) each defining an acoustic space (21,31). The spaces are in communication with each other via an end reflector (32) to establish an acoustic coupling between a rear-travelling sound wave (18) from a speaker driver cone (12), and a surrounding air mass. The sound wave eventually passes along the outer enclosure wall (26) leaving the bottom opening (27) of the enclosure. An audio amplifier (218,220,230,232) tunable to the resonant frequency of a listening room (21) removes very low narrow frequency band components of an audio signal produced by the speaker enclosures (10a,10b) and the listening room cavity resonance is measured by injecting a frequency-varying sound wave into the listening room while detecting peak sound energy within the room. A filter (220) eliminates frequencies associated with the measured resonance. |
