Power Cord Length


In another thread it was posted that power cords should be no shorter than 5 feet. Can anyone explain why a 5 foot power cord should sound better than a 3 footer?

A friend was recently told by a famous cable maker that a 1.8 meter cable sounds better than a 1 meter cable.
kana813
Oops....the link below suggest digital cable lengths are affected by it........
http://www.positive-feedback.com/Issue14/spdif.htm
Mahalo to everyone for your input. I can buy into Ivyinvestor's explaination of cable pinching. There maybe some stiff high end cords, which require more length to provide for gentle curves to meet installation needs, but otherwise I'll keep using with the shortest power cables possible.

just a guess here but it seems to make sence...if there is any sence to be made spending big $$ on power cords. In an article i read about using the house electric service to run computer network signals they indicated that they put that signal into the higher frequency range since the noise on the system resides in the lower frequency. My guess is that some of the high end cords are acting as high pass filters to some degree so that the noise is removed before it gets to the amp. A longer cable may increase the efficiency of the filtering?
it seems to do with attenuation of high frequencies energy, as the noise amplitude in those Mhz range gets weaker when distance travel gets longer.