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, there is still ringing phenomenon, that is, after the sound stops sounding, the tail sound (remaining sound) will continue in the speaker, and the sound quality will be destroyed. The influence of the sound feedback is not eliminated. After subtracting 6 decibels, this phenomenon 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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