Dedicated lines- need break in?

Nilthepill,

Glad to hear the electrician terminated the safety equipment grounding conductors in the same panel the branch circuits are fed from.

As for the sound you are now hearing, if I understand you correctly, you were not using the R1 recepts on the old existing 15 amp circuit. Is that correct?
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Food for thought.... even plain old NM-B cable, (romex is an example of NM-B cable), has a dielectric of thermoplastic (PVC) insulation covered with a nylon jacket.
http://www.soundstage.com/yfiles/yfiles200005.htm

Audiofeil,
Why do you allways have to be such a Richard?

Bill, I did install the 'audio grade' face plates along with duplexes.
I am sure your comment is tongue in cheek as usual. I happen to buy two duplexes and the audio grade housing and the 'composite' face plate about a year and half ago when I really wanted to install the dedicated lines during my house remodeling, but somehow project schedule and budget made this one of the last priority, so I had this Oyaide stuff laying around.... The housing, plate and duplexes sure do look great though. The Al mounting plate, black composite face plate and burgundy duplexes goes well with Ralph Lauren Silver Metallic paint ;-)

Shellie, I got two 50 ft extension cords and hooked up fan/heaters with both intending to run 24/7 (well, almost) , heaters/fans in my garage. So may be I will be able to go a little longer than a week, may be later hook up my TV or something for a while on this 20 amp lines to let it keep breaking in. Meanwhile I will continue to listen to my old 15 amp lines.

Jea48, I did connect one pair to regular 15 amp line (prior to the new 2x20 amp dedicated lines install) for a day or two- just to power source and preamp, not amp. Sound was virtually unchanged, if a tad bit warmer. BTW, Thanks for the link on the cable break-in phenomena. The opinions and experiments by some the big cable cos were interesting and informative read. The mechanism described there in makes a lot of sense. I did not know Sarajan used to write reviews for Soundstage.

Why would a dedicated line-15 or 20 amp- sound (significantly) better than regular shared lines? The usual reason given: 'noises' bled thru from other equipment on same lines/circuits corrupts audio signal. What freq spectrum this corruption impact? Low, mid, high or all across the band?

Be careful running heaters on long extension cords unless they are very heavy duty. A friend burned down his recording studio by leaving a heater running overnight on a lightweight extension cord. It was under a rug which caught fire.

Thanks for the tip, Rwwear. Yes, I am using heavy duty cords (Orange) and turn them off during night and when no one is around. It might take a bit longer but a lot safer.