It's wierd, but when I swapped receivers my amps on the RT2000p's and CS1000p are humming. I have all 3 speakers hooked up via speaker inputs only, and here is what's happening:
All three - the amps will auto-turn on when they receive audio, and will auto-turn off after a few minutes of no audio with one exception... read below
Left RT2000p - low hum, not audible unless you put your ear to the woofers
CS1000p - higher pitched buzz, not audible from my seating position 9' away
Right RT2000p - loud hum, very audible anywhere in the room and it's quite annoying. will auto-turn on sometimes even when the receiver is powered off and no signal is being sent
Also, please note that I have a power conditioner and the passive section of the speakers are dead silent. It's only the amplifier portion that's causing my troubles.
Here's what I've done to troubleshoot:
- I bought a 2nd receiver (for other reasons) and I'm having the same exact symptoms on my L/C/R amps. Both new receivers are 7.1 powered, so I have a couple of extra long wire runs to the extra surround speakers
- Unplugged the amps from the power conditioner and plugged them into a different 20amp circuit than my home theater is plugged into. I can't use a "ground lifter" since the ends are already 2 prong.
My troubleshooting is leading me to the amps being the problem since no matter if I plug it into a clean or dirty source they buzz/hum. But how can that make sense if they all began to have this problem when I was using a different receiver that does 7.1 instead of 5.1? Any help to fix this problem is appreciated!