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I second those emotions stated above.
My belief is so strong that I ran fourteen dedicated 120 volt runs and four dedicated 240 volt runs. This is exclusively to my two channel and HT system, and all in one room.
Regardless of the components used, the voltage change cannot be read on my digital meter. My performance gains were like Glen and Kthomas as well. Previously tried several power conditioners with mixed (compromised) performance.
Yes, the dedicated lines is perhaps the most significant and inexpensive (depends on who does it) tweak. While yer at it, pick out the best 10 gauge OFC romex for the power and try lifting/floating the ground which are the second/third most significant tweaks.
One last electrical tweak. Make certain all audio circuits are running off the same phase of 115 volts. This will eliminate/minimize any dirty AC line noise generated as a result of the opposing phases if some components are on one phase and others are on the opposing phase.
IMHO If you run dedicated neutrals (One per hot) this will eliminate any noise that could bleed over from the other bus in the panel. I would also much rather use an isolated ground all the way back to the main service rather than lifting the ground completely. This brings up a safety issue, which is also a code violation (National Electrical Code)
I admit we do some wacky things in the name of Hi Fi but lets not get to carried away.
Most Electricians would never lift the ground like that. And if they would, I wouldn't use them in my house :^)