Sub hum with Yamaha RX-750?

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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.

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Kimber Kable

Topic - Sub hum with Yamaha RX-750? - Kozmic 08:48:01 12/12/04 (1)

Re: Sub hum with Yamaha RX-750? - Kozmic 09:00:17 12/12/04 (0)

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