I had a hum about a month ago, when I moved my 600 to my back wall, and put my 2 350's up front. Doesn't make sense if everything is grounded to 1 location, meaning the main ground rod in the ground near the electrical entrance.
I removed the ground screw on the 600 and it worked fine. UNTIL, I just got Direct TV and have an HD receiver down in my theater. The HDMI cable is plugged into and HDMI in on my Denon and the power plugged into my Triplite surge/conditioner. Anyway, I have a worse hum than I did before. The dish and coax are grounded to the same rod, so not sure what is going on. The only way to stop the hum is to unplug my HD DirectV , or I've found if I unplug my front subs from the Denon Preouts it goes away as well.
I hate hums/ground loop issues. What gives.
