how long are your runs?
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From my experience (based on 240V AC), using the usual crappy TPC is fine as a feeder (and the only thing legal in the wall in this country), but use a guage you would use for a stove (here it would be 30A, in the US I guess it is 60A). Then use a high-end cable for the last 6 feet. For some reason about 6 feet seems to be enough to get the beneficial effects of the expensive cable, and running longer lengths tends to constrict the sound. Personally I have found that with a thick guage feeder and clean, tight contacts right back to the street, there is no need for a power filter - but your power company may not be as good as mine. Further, I would not recommend running several feeders to the one stereo system, unless you star-earth them close to the stereo - doing so would permit you to run a dedicated earth, which can be beneficial if you run a very thick guage one.