Longer Power Cords Sound better?


In my quest for power cords, i have noticed that a longer cord say 6 or 8 feet tends to have a nicer sound in my system that the same models that are 3 or 4 feet.
Power cords i have found this to be true include Cerious Tech, Cardas, and VH Audio....anyone have an explanation?

AND by nicer sound I mean they tend to have a richer midrange, and a more coherent top to bottom presentation.
ie
TVAD, ma' power chordses're real more thicker'n yourns. . . them's 7 incherns rounds! Wanna make somp'n of it huh, Huh, HUH?
Michaelwolf, yes you are right, and bad AC can give AIDS to unprotected equipment. That's why all my PCs will hence be protected by a Silver-based contact enhancer, which of course has also beneficial antibacterial properties. . . . oops, forgot that HIV's a virus. . . perhaps I should try a latex sheeth on all male IECs after all.
Gee I always thought longer was so I could posistion my equipment farther from the outlit if need be.
Since frequency extension, at the top and at the bottom, is the watchword of true hifi (hence the name) I have found that simple EXTENSION CORDS available at ACE hardware (they are paying me to say this) do the best job. Cascading them makes it even better--until the fire marshal shows up.
You mean to tell me that listening to a "high quality" PC in a 6 foot length and then replacing it with the same manufacturer's PC (same break in time etc) in a 3 foot length would make an audible negative difference? If you actually believe that once you exchange these two cords you actually hear a negative difference than, like the barnyard animals that sense a storm before the farmer does, I want to be hanging around with you so I am saved from the impending doom! I heard that part of the movie "Anaconda" was filmed in the listening room of someone who is convinced that longer PC's always sound better.