When the microphone is used in the sound reinforcement system, the amplification of the sound picked up by the microphone is an important indicator to investigate the degree of sound feedback. The higher the sound gain, the smaller the sound feedback whistle (less), and the more the microphone sound is amplified. Large, the calculation method is to open the microphone volume to the maximum (no acoustic feedback phenomenon), put a sound source in front of the microphone, measure the sound pressure level in the sound field and before the discharge tube, and subtract the front sound of the microphone with the sound pressure level in the sound field. The pressure level, that is, the sound transmission gain of the sound reinforcement system is obtained.
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