Well, I moved into the new place and got my stuff hooked up again. One problem, I have quite a bit of hum coming through the speakers (and sub). Enough that I'm going to have to do something about it.
I'm not the most knowledgable on hum, but after reading some "hum vs buzz" basics on the web, I think I've narrowed down the issue.
I think I have ground loop issues, because my plasma tv is on its own dedicated circuit and the source and receivers on another. I believe the component and HDMI connections between my Outlaw 990 and my Plasma tv are transmitting the residual current, which is then feeding the rest of the audio chain through the pre-outs and into the amps. I kind of figured this out because if I unplug the video outs (thus cutting the tv from the rest of the system) its quiet as can be. Also, if I do a non-tv activity (like run my PS2100 for 2-channel listening) it also is quiet. Mind you the tv is still hooked up in that scenario, its just not on. It will buzz in passthrough mode, but if I switch the PS2100 to say the MP3 input, goes silent instantly, why it blocks it, don't know, but it does.
So does anyone know how to block ground loop differences over component and hdmi video circuits? I suppose they make isolation transformers for that, does anyone know of any good ones or where to get them? I suppose in the short term, I might try and unplug my tv from its own circuit and run the cord back to the amp plug in behind the wall and see if that helps. Its kind of a pain, since its mounted on the wall and I'd need to rehang it, but its worth a shot while I figure this out.