Hi-pitch hum when I run M-Audio output via mixing board, but not when I run output direct

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Hi-pitch hum when I run M-Audio output via mixing board, but not when I run output direct

2013/01/01 13:57:38

ericphilo

I have m-audio fast track and a behringer eurorack mx2004A. When I run the output of the m-audio to the control room amp/speakers via the mixing board, I get a high-pitched hum...when I run it direct, no hum. Any thoughts?

Thanks,
Eric

2013/01/01 14:05:06

Wookiee

Ground Loop. Different earth points for the M-Audio than the desk.

But please do not go removing any just try to use a common earth supply point.

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Hi-pitch hum when I run M-Audio output via mixing board, but not when I run output direct

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