The maximum available gain is the gain of the sound reinforcement system in the feedback self-excited (howling) critical state minus 6 decibels. At this time, the sound reinforcement system should have absolutely no acoustic feedback. In the critical state of feedback, due to the phenomenon of ringing, that is, after the sound stops sounding, the tail will continue to be heard (residual sound), and the sound quality will be destroyed. The effect of acoustic feedback is not eliminated, and this phenomenon is subtracted after 6 dB. Disappears, set to the highest available gain. The higher the value, the stronger the amplification capability of the microphone channel sound, the better the acoustic feedback howling, and the microphone channel sound can be greatly opened.
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