How does the q76 square dance stereo make noise when plugged into a wired microphone?

If there is an occasional strong "snorting" sound, the microphone cable may be in poor contact, and if it is plugged in, there is an immediate strong and persistent "squealing" sound, which may be due to the open circuit of the microphone cable shield.

If the microphone whistling, when using the microphone do not pay attention to the speaker, adjust the angle and distance, but also pay attention to the microphone volume is not too large.

If any microphone is inserted into the noise, it is the internal problem of the sound, which has to be repaired.