Finally got a dedicated line installed for my 2-channel system. I'm using 12/3 cable to power two outlets. I decided on 12 gauge and a single run to reduce costs. Damn copper -- the price keeps increasing.
Anyway, the basement was the best approach to run the cables. Fortunately, my basement had an unused 220 wire. I think it was there in case the owner wanted to renovate the basement. So all we had to do was buy a subpanel and a couple of 20 amp circuit breakers, tap into the 220 wire, route the 12/3 off the basement ceiling studs, drill a hole through the floor behind the wall, then feed the wire to the new, commerical-quality outlets. I hired an old school electrician and he only charged me $90 labor. I bought all of the supplies.
OK, so how does it sound? Great, so far. I only played a few songs tonight, but here's what I noticed: the soundstage expanded, there's more clarity and subsequently more detail, and it's also a slightly more dynamic. On one song, in particular, I was taken back by the "new" guitar plucks. I was expecting a darker background, but maybe that's what I was hearing. I dunno. I also believe the new wire needs to break in. Not sure how long it'll take for 50 ft. of Romex to settle down, but I can expect more improvements over the next couple of weeks.
Overall, I'm very pleased with this tweak. The cost was about $180, and the improvement is like an IC or speaker cable upgrade. More importanly, I have the peace of mind of knowing that I don't have any other crap on the line like I did before (a dimmer switch and celing fan, and a bunch of outlets -- yuck!). BTW -- I don't use a power conditioner.
This will be my last tweak for a while. I'm all tweaked out. I think I'll spend the rest of the year looking for more music, then focus on upgrading the HT system in 2008.