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

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ericphilo
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2013/01/01 13:57:38 (permalink)

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

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

Eric
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    Wookiee
    Rrrrugh arah-ah-woof?
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    Re:Hi-pitch hum when I run M-Audio output via mixing board, but not when I run output dire 2013/01/01 14:05:06 (permalink)
    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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