That happened to me once a

#174414
AvatarChino
Participant

That happened to me once and it was a bad cord. I threw it away and got another one. Also, mic cords with the 1/8th inch connector are more likely to have interference than cords with the three pin XLR connection. Especially if they are longer than a couple feet.
Also, neon or flourescent lighting can cause interference.

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