I plugged my amp into the front left/right spots and its just a loud hum (not like a little interference, but like it out does the actual sound), and the volume goes in and out and jumps up and down. I hooked up everything and excluded the receiver, and it works fine. I hooked everything up and plugged one of the speakers thats plugged into the amp, into the center channel pre-out, and it played. i tried each part in between, and it all works, except when i plug into the left/right re-outs. Its the only thing i could think of.. I know someone mentioned it could be a ground problem, but i took all there advice and i dont see how. All i did was hook my sysytem i already had in place, into the receiver, and it isnt working properly. When i hook any speaker up to the regular binding posts on the back of the receiver, they work fine, too.