Eliminating Ground Loop Problem

How’s that routing OP? Do you have cables laying over cables?

Cable art.. I should teach a class. It’s fun too.

Make sure nothing is touching, NOTHING. If cables cross make sure there is at least an inch between them and at 90 degrees.

Run them side by side, but NO touching, especially Power Cables (not cords) and Speaker Cables..(not wire).

You can check pretty easy by, lifting and lowering cables.. The sound will Yo Yo..

Regards

gdnrbob.

Thanks so much for the information. I will certainly reach out to him.

oldhvymec,
Yes, I'm embarrassed to admit my cables are all over the place. It's a complete mess behind my equipment rack. I will try to organize the wires the way you recommend. 

My question is why when listening to 2-channel is everything dead silent?

OP a ground loop is the difference in voltage between two pieces of gear. A ground loop eliminator is BETWEEN the source and preamp/power amp. IF the noise is coming from just the Preamp, no matter the source or the power amp, that’s not a ground loop. BUT it could be a GAIN issue... from another source, don’t be fooled.

Another thing.. routers and Laptop power supplies. UNPLUG them.. Just for now... Noisy thing Especially cable company router box power supplies.. The older the box, the higher the noise level and power consumption.. My old cable box pulled 270 watts.. YUP.. I was floored, It actually required a ground loop eliminator via The Cable Company, Comcast..

Friggen ark welder... LOL

Regards

When I'm listening to music through 2-channel there's absolutely zero noise. When I watch a movie I turn my Marantz 7702 mkII, OPPO 203, and ATI  AT523NC 3-channel on to drive my center and rear speakers. The noise comes through my center channel speaker and rears. ATI told me to disconnect the interconnect cables from the amplifier and see if I hear a hum or any noise from the amplifier. I disconnected the interconnect cables and the amplifier was quiet. I have a wire going from the Marantz's ground to the ATI's ground. The wire reduced the noise, but didn't eliminate it. The noise can only be heard during quiet passages, but it drives me crazy.