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
No doubt, it is a known fact that the higher frequencies are shorter wave length electrons and therefore cannot travel as far as the midrange electrons. Just like spermatazoa.
That's why the longer power cords have more midrange.
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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.