Special circuit to suppress speaker distortion

 　　Modern radio broadcasting, especially FM radio, broadcasting quality is very high. Under these conditions, the receiver's fidelity is almost determined by the structure of the audio part. Therefore, people pay much attention to the acoustics of low frequency amplifier, speaker and receiver. But the most weak link in the low frequency system is the speaker, so all the measures to improve the performance of the speakers are of great significance.

 　　In high - quality amplifiers, large - sized speakers are usually used, but the large - size speakers are very large in diameter, and the complex motion of the paper makes the high - order harmonic generation in the system, resulting in a nonlinear distortion. And in a some short sound when, the cone will continue vibration for a long time, which produced the one kind of special distortion -- transient distortion.

　　In order to overcome the instantaneous distortion, former Soviet Union scholar A.A. Kulikovsky, in his "amateur radio technology", research and development the special inhibition of speaker distortion, negative feedback circuits. Most of the circuit is not used by radio enthusiasts. In the feedback effect, no distortion, the loudspeaker with the increase for the corresponding movement in the loudspeaker coil voltage. If distortion, the movement of the paper is not with the sum of the voltage response, and in the voice coil to generate a new voltage at both ends, if the voltage is removed and then inverted into the amplifier output, distortion can be suppressed.