| 摘要 |
FEEDBACK SYSTEM FOR A SUB-WOOFER LOUDSPEAKER The present invention provides an apparatus for enhancing the low frequency response of a loudspeaker. At low frequencies the mechanical and electrical inefficiencies of loudspeakers limit the intensity of the sound output by the loudspeakers. Previous attempts to correct the inefficiencies have been hampered by the nonideal circuit elements used in conventional feedback circuits. To enhance the low frequency response of a loudspeaker there is provided an apparatus which includes a feedback circuit which is operably connected to an audio amplifier and which is tuned to substantially match the impedance of the loudspeaker within a predetermined frequency range. The apparatus further includes a transformer having a primary winding and a secondary winding. The primary winding is adapted to connect to the drive coil of a loudspeaker, and the secondary winding is connected to the feedback circuit. The feedback circuit delivers a feedback signal which alters the audio input signal in response to a voltage induced on the secondary winding by the primary winding, and compensates for the low frequency inefficiencies of the loudspeaker.
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