First of all, before the performance, we should debug ~ sweep the frequency ~ test the directivity of the microphone ~ Second, we should put the receiver antenna flat ~ Don't put it with the mobile phone and other things ~ There will be interference ~ Then the microphone position ~ Don't be too close to the speaker ~ There will be crosstalk ~ Don't open your mouth too much ~ It's just the gain of the mixer ~ We basically only give a little ~ It won't be like this when preparing for the performance in the early stage ~ Hehe ~