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To connect the wireless microphone to the connected sound, you need to use the audio connection line to connect the audio output of the wireless microphone receiver with the MIC input of the sound. There is no sound after the wireless microphone is connected to the stereo, there are two cases.
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First, no output caused by sound, you can use a wired microphone to test whether there is sound, if there is sound, it means that the sound is no problem.
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The second is caused by the wireless microphone kit, first the frequency of the microphone and the receiver is good, and the volume of the receiver is turned on to the maximum, when speaking to the microphone, see whether the volume indication of the receiver will change, if it will change, it indicates that the microphone is not a problem. The fault could be in the receiver or the wiring. You can replace a connection line to try to see if there is no output, if there is no output, it may be a wireless microphone receiver fault. It needs to be repaired.