New expensive power cord for amp and no change in sound?

I bought new an expensive(for me) well known and reviewed power cord for my very good amp and plugged it directly onto the wall socket. After a couple of weeks of daily use I hear no change in the sound quality from a $500 cord. I don’t want to name it for fear of getting my thread deleted. You would know it or at least be aware of the company. Did I throw away several thousand dollars? Before I get the snake oil answer I want to let you know that I bought an upgraded cord for my pre as suggested by the pre’s manufacturer and am pleased with the results.

I guess for full disclosure the amp’s manufacturer said don’t bother. But I had had good luck with the pre so I thought it would be a good idea.

Anybody else have this happen to them?





2,451 posts

"Unless there was something very wrong with your last power cord, or it was just a very poorly made one, you’re not going to here any differences other than those that occur within your own mind via confirmation bias."

- prove it

The scientific methodology that can found/support/refute theories works on disproof via hypothesis testing. Science doesn’t prove anything. Very common misunderstanding.

The crux of this thread’s OP is that an expensive power cord was compared to a more expensive power cord (albeit with the usual flaws that make an uncontrolled design) and no difference was detected. That is, quite literally, hypothesis testing for difference, and @roxy1927 failed to reject the null (Ho = no difference).*

I understand why the deterministic claim of another poster you quoted might have bothered you, @dill - fine. But instead of picking at someone for typographical errors or for stating a strongly-toned difference of opinion, consider further study on how experimentation works. The info is out there and free. 😉

This thread posed something different from the paradigms of increasing sonic returns for money spent and being able to count on improvements using one’s own hearing (maybe). But it’s one uncontrolled (sighted, ill-timed, etc.) design that merely supports a camp of cables-can’t-be-audibly-different by way of failing to reject a null.
No big deal, really. If everyone chats about their experiences but no one’s controlling for their biases or setup, then it’s all different variants of apples and oranges - nothing that comparable when everything is confounded by incongruous variables, hey?

*in hypothesis testing, the investigator(s) will not “accept” a hypothesis any more than they’ll prove something. They reject, or fail to reject. That may look like semantics in print, but it’s a very important discrepancy in practice.

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....or the hyperbolic pontificators? :)

Full disclosure, I make my own power cords using Supra wire and their connectors.  These are relatively inexpensive and they certainly do a fine job whether the component is tube or solid-state. And while I've experienced merelt changes or an occasional "improvement" in SQ from wire to wire, cables that, from my perspective, are priced absurdly high, make no sense.

The purveyors of those high-priced wires will, of course, disagree.