| 摘要 |
<p>A loudspeaker device comprising a subtracter (6), a power amplifier (13) to which an input signal is inputted through the subtracter (6), a loudspeaker unit (1) for reproducing the output signal from the amplifier (13), a sound tube (2) coupled to the front of the loudspeaker unit (1) so as to guide the sound wave from the loudspeaker unit (1), and a negative feedback circuit constituted of a microphone (4) for detecting the sound output radiated from the loudspeaker unit (1), a microphone amplifier (5) for amplifying the sound signal detected by the microphone (4) and feeding its output signal directly to the subtracter (6), and a high-pass filter (7) through which the output signal from the microphone amplifier (5) is also fed to the subtracter (6), whereby the peak dip of the sound pressure frequency characteristic is suppressed to flatten the acoustic characteristic.</p> |
