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I've got a RX-750 and I'm using a Crown MA2400 for the subs. I get a hum from the 750 only on the sub. It can be greatly lessened by lifting the ground on the amp, but it is still quite loud. It's not the amp or speakers because it doesn't hum with my Crown Pre amp hooked up, only when it's hooked to the Yamaha.
Follow Ups:
I've removed the ground from the amp and reversed the polarity of the power. Nothing seems to help.
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