Do powercords make a difference in sound?

It's kinda like:

Does having a dog make a difference?

As you go door to door around the neighborhood talking to people, you get answers like:

Yes. A lot. They are part of our family. He/she is my best friend.

A little. I seem to be a little happier and my blood pressure has dropped.

Not so much. But I do sleep better at night knowing it will bark if anyone comes around.

No difference. How could a dog possibly make a difference in your life. I have no desire to try.

No difference, part II. I had a dog and now I don't. Don't feel any different.

Absolutely no. I've read on the internet that they kill people. You'd have to be really stupid to get one.

I *suppose* you could substitute cable for dog. (ya think).

That was Zen, this is now. Yeah, pc's "can" make a difference. I hear it on some equipment. Didn't believe they could for a long time then I got a dog, I mean pc. The first few actually hurt the sound compared to stock, then found some that helped a little.

Bang for the buck: Volex 14/3 around $10. Pangea at 50 on up.

Foster_9 and Jedinite24,
Good points. I have tried the "newer" Volex's that came with some amps I bought. They do not sound like my older brass bladed ones. The newer ones are a little skinnier (still 14/3 though) and have a nickel plated plug. Nickel seems to hurt the sound to me. I lopped off the end and replaced it with a $5 Home Depot Pass & Seymour brass one. Moved it toward the the old ones sound. I still think the newer one is okay, especially for a street price of $5-7.

Seeing as the can has been emptied and we have worms crawling all over the place :-), how about shielded vs unshielded cords? It "could" make a difference in "some" systems. That's about an hour past vague but could be dead ball on accurate.