How can power cords make a difference?

Thank you for your comments Albert. You are quite correct. My friend was sceptical, and his bandmate had no idea at all about wire. His feeling was that there were no gains to be made via something like this. Now, both are not only believers, but unwilling to give up these gains. My friend has been opening his eyes to our hobby(and how to merge it into pro audio) to the point where he may just join me at the Hifi show in New York City this weekend. I call that a metamorphosis. I only wish the nonbelievers or "flatlanders"(I told you that they are anything but objective to me) would open their ears and minds to the differences brought about by wire(and analog, and electronics, and tubes...). Perhaps all they need to do is to go out and listen.

Doug - I don't have any fancy line cords. I will try the following experiment. I do have a 100 foot very ordinary extention cord. I have heard people report that even changing a 6 ft cord to a 3 ft cord made a difference. So, I will run my system thru 100 ft of cheap cord and see what happens.

I suspect that if I hear a difference people here will belive me. If I don't hear a difference people will assume that my system is bad or my hearing is bad or that after 6 ft of cheap line cord it can't get any worse.

Which brings up a question. Just how low does the distorion of ones system have to be before it becomes possible to hear the additional problems caused by cheap line cords.

And, science is what makes the marvelous equipment we have possible. Scientists and engineers understand and design amplifiers, preamps, digital and analogy recording and play back technology. Non-scientists make line cords and speaker wire and can't explain how even they work.

I disagree Steve. I think science followed audio design. The true pioneers in audio designer are DIY not text books! Audio has grown because kids built systems with Heath kit and the like, then tried other components, no science there, not in a 9 year old soldering with his dad!

Stevemj: I don't beleive that measured distortion has a lot to do with hearing the differences (in my setup anyway). I use a 300B tube SET amp which must rate rather high on the distortion scale and almost every piece of cable that I have tried has a different sonic signature. I have tried many commercial 12 gage and 14 gage extension cords (as you are about to do) in my setup and they all suck by adding a harshness to the sound (a 50 footer actually made the images smaller and the sound stage had less height. If you have used the cords as I do (outside with power tools) be sure and clean the contacts well (mine were filthy).

Dekay is correct that measured distortion has nothing to do with the changes you will or wont hear. I did the experiments 20 years ago before exotic PCs existed. Back then all we had were cords by giant commercial cable companys,(like Belden, Columbia, Woods etc.) Even with the off the shelf wire, some large gains were made by trial and error. Also different solid core lines from the breaker to the outlet made dramatic differences. Blindfolding is nonsense. The truth of the matter is evident with living with the changes you have made. If your change was positive, you will know it as you listen. If negative, you will want to turn the whole thing off, as fatigue sets in.
I do not think the whole ABX crowd is really in tune with listening to music over extended periods, because there is little doubt in the changes being real once you listen long and hard.....Frank