1. The most likely problem is the wire material, try to reduce the use of civilian non-shielded wire and inferior wire, try to use a slightly more professional shielded wire.
2. Arrange all the lines and keep the power lines away from the signal lines. Keep things that interfere with the signal away from the recording device.
3. The possibility of problems with the microphone and the mixer is very small. For the mixer, you can change the input channel of the microphone to try it out; for the microphone, the quality is not too bad.
4. Try another computer. The internal interference of the chassis is also very likely. If possible, buy an external sound card. The built-in sound card is more or less interfered by the complex electromagnetic environment inside the chassis.
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