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RE: Incoming AC legs NOT created equal...

Posted by Rick B (A) on June 2, 2017 at 09:00:25

In Reply to: RE: Incoming AC legs NOT created equal... posted by jea48 on June 2, 2017 at 06:06:14:

It would have still polluted the line as all lines lead back to the fuse/breaker box, it would have just had farther to go...if it would have been on the opposite phase, maybe not as much, but crossing phases like that is a no no.

When the Audio Prism device was brought out to the market, I took and did a lot of experimenting with it on differnt noise conditioners, power cords, etc., and it was interesting to see what did what....this experimentation was over a decade ago, so I didn't have any of the currently available line conditioners at my disposal....

It was interesting to take the power conditioners that quietened the line noise the most and then to plug an Icom R-71A SW receiver into them with a short telescopic whip antenna and attempt to receive WWV, WWV is a broadcast from the National Bureau of Standards in Ft. Collins, Colorado providing time interval information on 2.5, 5.0, 10.0, 15.0, and 20.0 MHz 24 hours a day. This experiment was carried out during the day when 15.0MHz was the strongest signal into South Texas, and the house I was doing this in had exterior walls of stucco, cement over wire mesh, so it was basically a Faraday cage.

When trying to receive a signal without any power conditioning, the noise level in the receiver was nearly at signal level...but, when a combination of power conditioning and power cords was tried that had shown good results with the Audio Prism device, the noise level fell greatly and the signal appeared cleaner, clearer, and easily readable. The Icom receiver is a very high quality unit built to a standard that made it one of the top rated SW receivers for many years. Yet, even this device with its' ostensibly well built internal power supply was affected by the AC feeding it.

So, what does this have to do with audio?

It showed me that noise pollution from our AC lines can get in through even well designed and well filtered power supplies and affect what we hear from our systems...we may not notice it overtly, but can tell when it's influence is gone.

I just supervised an installation of four home runs, dedicated lines, in a client's listening room each run made with 10ga, wire and outfitted with Shunyata AC outlets, and all run from the same phase...I have not had time, though, to really evaluate the system as he has some guests temporarily staying at the house, but a Shunyata Denali for the source equipment did perform much better than an MPC 12, even with the dedicated lines....

Two of the other lines each have a Pass XA250.5 on them....I don't think we are going to be current starved now!

And, as always, YMMV

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