1. It is related to the sensitivity of the microphone. It may be that the sensitivity is too high, but in fact, sometimes high sensitivity is required. In this case, headphone manufacturer,you should try to reduce noise when recording.
2. It is more likely that the electromagnetic interference of the microphone is too great. Because condenser microphones have almost no internal resistance, their connections are very susceptible to electromagnetic interference, so generally condenser microphones use shielded connections to reduce interference. This can be distinguished by completely blocking the microphone head, such as pressing it against a rubber pad. If the noise is still relatively high, it should be mainly electromagnetic interference, so it should be replaced with a better shielded connection. Connect a suitable resistor in parallel with the microphone (according to the specific situation of the microphone, you can try to use a 10k or larger potentiometer, or simply build a 100k potentiometer yourself and manually adjust the resistance to the appropriate resistance), the parallel resistance will reduced to a certain extent. High sensitivity, while filtering out some electromagnetic interference. like: How to choose a karaoke microphone How to connect a microphone and a smart speaker Difference Between Wireless and Bluetooth Microphones ick here to edit.
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