How can power cords make a difference?


I am trying to understand why power cords can make a difference.

It makes sense to me that interconnects and speaker cables make a difference. They are dealing with a complex signal that contains numerous frequencies at various phases and amplitudes. Any change in these parameters should affect the sound.

A power cord is ideally dealing with only a single frequency. If the explanation is RF rejection, then an AC regeneration device like PS Audio’s should make these cords unnecessary. I suppose it could be the capacitance of these cables offering some power factor correction since the transformer is an inductive load.

The purpose of my post is not to start a war between the “I hear what I hear so it must be so” camp and the “you’re crazy and wasting your money,” advocates. I am looking for reasons. I am hoping that someone can offer some valid scientific explanations or point me toward sources of this information. Thanks.
bruce1483
While not cable related, an an anecdotal exchange occurred this past weekend that gives an interesting bit of insight into how some people's training is almost akin to brainwashing.

A couple of friends helped move my large items like furniture to a new place. My system had been moved and set up a week ago, though it is still going through fine tuning for the room.

Both of these friends are mechanical engineers. Rex is a vibration control expert who's into home theatre. We've had many a lengthy, often times spirited, exchange on equipment. Rex is, for the most part, a non-believer in tweaks and cables (after a point). This was the first time he's heard my system. John, as I've described before, is an acomplished musician and has spent many an hour in my living room listening to music. He knows my system almost as well as me.

The work finished we settled in for a couple of beers and a demo for Rex' benefit. Unrelated, but I found it interesting that Rex, Mr. HT, found it necessary to drive the volume far beyond what the room would handle. Not just as a test of its limits, but as a chosen listening level. He did exhibit a good ear by pointing out a shifting image in the soundstage I hadn't found yet.

Anyway, at one point Rex picked up a spare set of Black Diamond Racing cones that were lying next to the rack. The gist of the commentary was that all tweaks are "snake oil", that nothing in his training allowed that they could possibly do anything to effect the production of sound. He and John kidded about going into business making something that *seemed* exotic and how well it would sell. Then I made a mistake. I reminded John about an experiment we'd done with the BDR cones. One afternoon we had put a spare pair under the pre- and, he admitted, then and in this conversation, that it *had* changed the sound. He blubbered some excuse to Rex about not being able to quantify whether it was an improvement (his otherwise good memory suddenly failing him) and the subject was quickly changed.

While helping me return the moving van John took an opportunity to mildly chastise me for embarrassing him in front of another professional engineer. He was obviously torn between his education and that of a respected colleague's and first hand experience.

It's at times like this that the fact I am, for the most part, self educated, has great value. It has not been drilled into my head that "this is *always* the case" and the ability to see things for what they *really* are is still part of my faculties. It's unfortunate that education somehow has taught these otherwise intelligent people to believe books before their own senses. That's not to say education is bad, just that the rigid thinking it promotes is one of its downsides.

BTW, I know deep down John is actually a convert as he's been around while my system has matured. He's seen what various cables and tweaks have done, both good and bad. Rex doesn't know it, but he's next.

Redkiwi: Your last post shows we're somewhat in agreement. I would gladly participate in an exchange with the members in question if it were an open minded exchange. I simply refuse to participate in circular debate. It serves no purpose except to occupy space and time. That and it frustrate me. Apparently you, too, after awhile.
Albert, Jadem6 -

OK, I'll bite. Could you two get together and figure out, say, 2 cords the most likely to differ from stock? I'm willing to listen to them, first sighted and then blind, and will report back the results (and return the PCs, maybe . . .). Might have a chance to pick up a PC from Bruce, but would like to keep the total to a reasonable number.

Cheers,
Jhunter
Jhunter. I just spoke to Jim Aud of Purist Audio Design. Jim has graciously offered the (temporary) loan of a Dominus Power cord for your testing. If you will contact me via the Audiogon e-mail system, and give me your physical address, the cable will be sent directly to you freight prepaid.

I will most likely get my Acrotec cables back this next Tuesday, and I will ship them separately.
this is *great*!!! i *love* it!!! now, all we need is for 702 & stevemj to agree to try 'em...

doug s.

Thank-you Albert, you are a great person! I look forward to your report Jhunter.