With a 950, 770, sub, various source components, and a TV, you can probably put them on a single circuit, although you might consider two circuits -- one for the 770 and one for everything else. (Anybody else have a thought on that? I've got a second circuit and haven't seen a need to shift anything to it, but my degree's in mechanical engineering, not electrical...)

The sub and 770 should be able to share a circuit without any trouble at all.

As for conduit routing, a basement would be a very slick way to run new conduit -- everything exposed and easy to install, and you'd only need to mess with a little bit of sheetrock at the new receptacle. Feeding receptacles from the floor is always preferred over feeding from above, because it cuts down on the conduit and wire required.

I am not absolutely positive about it, but from what I understand about dimmers it is very possible that they can still put noise on a dedicated circuit if there is no conditioner or filter of some sort blocking their path.

The Panamax MAX5100 that I use retails for $350; it can be had for as little as $200 online, but you may not get the insurance included (non-licensed distributors). Here's Panamax's list of approved online distributors. Brickwall also makes some good surge protection / conditioning products , including an 8-outlet unit (8R15) that costs $200.

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