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In Reply to: RE: Questions on mutiple dedicated lines posted by jimmyjames on October 27, 2009 at 05:46:32
Most audio power supplies do not draw sinusoidal current from the AC. The supply circuit impedance converts power supply current into a noise voltage. This noise voltage can have a very broad frequency spectrum. Any other audio components on the same circuit see this noise, and may not be able to filter it effectively with their power supplies.
Passive power conditioners that provide as much isolation as separate dedicated lines have to use series inductance with at least some of the outlets, and this can affect performance. Active conditioners are quite a bit more expensive than typical AC circuit installation costs, even with top-notch outlets.
Follow Ups:
I was using two dedicated lines, one 30 amp for my power amps and a 20 amp for everythingelse.
I went back to just one 30 amp dedicated line.
I run it directly into my Furman 20 amp input with a 20 amp Wattgate receptacle.
The Furman balances the power to a Hydra 2(amps) and a Guardian 2 for the pre and cd.
It sounds better with everything into the Furman and off one line than separate runs .
Why this is so i don't understand.
In theory the way I had been doing it(separate runs) should have been better.
And yes, I was on the same phase at the panel.
The CD player may be affecting the preamp, or vice versa, if they share the same conditioner.
but then so do $250,000 loud speakers. I would rather spend the money that all those dedicated ckts would cost on a decent power filter/distribution center. Noise coming in on the power line doesn't care how many ckts you run. Not sure what having those lines on different phases might do either but I guess you could put them all on the same phase bus bar if he was going to have 8 circuit breakers. Most 20 amp c/b's are rated for 2 wires max under the lug.
"E pur si muove...And yet it moves"
that my system sounds a lot better when my Wadia 861 does not share an AC circuit with a power amp.
You don't need $250,000 speakers to hear the difference.
Damping the dedicated circuits also helps, and costs little. The circuits and parallel filters are much cheaper than a fancy conditioner.
that my system sounds better with the MIT Z filtering in the system than without. Whether or not dedicated lines for digital and power eqpt in my system would make it sound better or not would need to be tried. Along with that experiment, I would want to try the digital and power gear on different and same phase legs in the panel to see if that made a difference but that is a whole lot of trouble.
My point about $250K speakers being overkill along with 8 dedicated ckts is just that. IMO you don't need either to have a great sounding system. If you have unlimited resources and time then go for it. I realise that some posters here are after the ulimate sound and want to constantly tweak and spend money but I have grown beyond that stage. Life is too short. I get more enjoyment out of listening and finding components and tweaks that perform way beyond their price point and downsizing my system accordingly.
"E pur si muove...And yet it moves"
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