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

Showing 7 responses by fpeel

Same here Elizabeth. A realist by nature (some might even say pessimist but I don't think the affliction is quit that advanced) I tried a "designer" cord on a whim. Fully expected to notice no difference. On the source (DAC or transport), where others claim the most benefit, there was no appreciable effect. Putting it on the preamp was another story. The sound was more "musical" and lively. On the amp the difference was VERY noticeable. Here it brought a considerable increase in the heft of the low end and at the same time the overall sound was less strained.

Bought another cord to put on the preamp. Ah, the best of both worlds. Eventually my anal retentive nature caught up and now everything has an upgraded cord. The source didn't really *need* it, but what the heck!

Ultimately it paid off that even as a doubting Thomas I was willing to try something new. If only that attitude could be bottled...
Before someone else jumps on it, let me be the one to respond to Redkiwi with, "That's because you expected it to sound bad. There's no way power cords can make a difference." Not because I believe it, but because the responses have become so predictable. Maybe this way we can get a chuckle instead of an argument out of it. Thanks for the insight, RK.
Guys, haven't you figured it out yet? 702 is getting exactly what he wants. It's not insight, education or sharing as with most of the participants here. It's your collective goats.
All good points, Redkiwi. Personally, talking to the collective brickwall grew old quickly and feeling it was a waste of energy choose simply not to do so. Circular arguments tend to have that effect on me. There are far too many other interesting threads available to feel any sense of loss. In any case, it certainly wasn't my intention to encourage anyone to alter their approach.

Anyway, whatever happened to "RHUBARB!"?
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.
Jhunter and Kjg, I am also in the San Jose area. Would the two of you be interested in dropping by for an afternoon of listening? If so please drop me a message with your contact info. No tests will be given or taken; don't need the stress. We could do it in a couple of weeks or so as I'm just getting settled into a new place. This invitation also applies to other interested Bay Area residents, too.

Frank Peel
Mmccoy, that's a fair question, but one that's been answered in detail a number of times. To save you a bit of research, the short answer is, and please understand this comes from a non-techie, the differences lay in the shield configuration, conductor size and construction, quality and types of materials and workmanship, and, in some cases the additional components (i.e., filter materials, also called "magic dust"). None of that is to say I personally buy into the mega-price cable story, BUT I also do not have first hand experience with extremely expensive power cords. Certain of the claims do, on the surface, make sense. My ears say upgraded cables do make a difference, though. My only question is where does the "improvement curve" drop off into silliness, if it actually does? Hope that's helpful on some level.

BTW, if any of that is grossly erroneous, guys, please correct it. I try to pay attention, but don't always get it right.