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Old 22nd May 2016
  #5
Lives for gear
 
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So, i have these QSC amps. I use a MiniDSP EQ. It uses a wall wart 12vdc PS. It has phoenix connectors. I wire the EQ with hot,neutral,ground to the QSC amps. This is where the Hum comes in. On the input side, I connect the ground with neutral, and that goes to my Denon receiver (LFE Out).

The fix came from grounding the chassis of the EQ to the QSC's, all four, and lifting the ground that i connected to the neutral on the input. No hum at all