I have a AV-F100 speaker system and until I changed my wiring I didn't have a problem. I had to change my setup when I replaced my LCD TV stand and to reduce the wiring I've connected the speakers directly to the amp rather than the SW. I now have no depth to the sound and the SW only seems to produce anything as and when it wants. I made no changes initially to the amp settings just the wiring changed but I get intermittant sound from the SW and even changing tv channels can knock it off. I can change the ATT to on/off 0 or -10 and it would work for awhile then change tv channel or swap to DVD and it would lose bass. I'm pulling my hair out at present so any assistance would be most welcome especially for my poor suffering wife.