Wow, what an experience!! Short story. Finally went separate, got a hiss. Unplug everything except speakers, got a hiss, hear it from only 3-4 inches. Invite a friend, electrician. We redo all the grounding at the servive panel, 2 new rods (old one was under the house...), reground sat-dish and coax to this new rod (was grounded fast and dirty on a light fixture lol),all the house grounds redirected there (so no loop), 20A dedicated circuit with high magnetic breaker, cable-loop-ground isolater from RatShack from the coax feed...and... the hiss from tweeters is like 10 times louder, even ear it from my main listening position now, and spreading into a hum from the woofers (was not there before) !!! What's happening!!! Help me... By the way, my electrician friend told me a funny story. Farmers are fighting, like us (lol) against ground loop. Cows don't drink if they feel a ground "current" in their watering place...Talk about a double-blind test!! Humans cannot feel this current, but cows feel it...No audiophile anymore, but cowdiophile... I demand equality with cows. No more hiss or ground loop for me. Help me.