WHY does the microphone hum?

As a matter of fact, there are many reasons for such an odd phenomenon, here are the main ones.

Nearby there is a source of radio-frequency radiation. In most cases, the phonics begins if there is any electronic device next to it.

Improper setting of the microphone.

Signal level. If you amplify the sound or signal level, this can also cause unpleasant sounds.

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