Power cord? Why?

well, in my system power cords certainle made a difference on my CD player, but none whatsoever on the power amp...i went by trusting my ears...the CD player made in France had some problems with the stock power cord (including a dim display)...after replacing the power cord, the CD layer seems to be just fine and the display is nice and bright...now, on the amp was a different story...i couldn't detect any change in the sound at all...i even tried a test with some of my friends...we took turns to replace the power cord on the fly while the music was playing...you can do that safely if your amp (has to be SS not tubes!!!!) has a good power supply...we had the stock power cord and another one that costs $500/6 ft...someone was switching back and forth between the two while the music was playing and we couldn't detect any change in sound...what was even more surprising was that the amp played just fine for 4-5 seconds even without power cord...was running from its own capacitors without a change in the sound...well, that was pretty conclusive for me that the power cord have absolutely no influence on audio gear that has a well designed power supply...
again, just a personal experience...

I have no idea if it had an AC input filter...the amp that I tried the experiment on was Innersound ESL amp into a pair of Innersound Isis speakers...I wanted to see for how long will the speakers play if I remove the power cord from the back of the amp...it went with no problems for about 10 seconds...the sound faded away in about 15 seconds...

Audioengr...talk with Roger Sanders at Innersound and tell him that power cord made a difference with his amp..I wish I could hear his reaction when he hears/reads that...now, how do I suppose to know which power cord is the "right" power cord?....i wish someone could publish a list of "right" power cords and "not-so-right" power cords...i'm sticking to my beliefs: a well-designed/made power amp does not need a power cord...

Audioengr, i believe in speaker cables and in interconnects as i've herd differences between diff. cable manufacturers...and i believe in power cables for SOME applications, but not in all of them...happy listening!