Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Sound › need help – feedback when using microphone extension cord › That happened to me once a
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.