If we have meters and meters of cheap cables inside the walls, why shall we, on the LAST meter or so, use an expensive power cord? This doesn't make any sense... or does it? I told you it was a Basic question... Regards.
Steven: If this were so, then why do various line cords, that do not have any of these features, sound different from one another? I think that you must have left something out. Oh well, back to the drawing board.
The medium that signals pass through must affect that signal, therefore differences in medium = differences in sound and therfore no filtering device is needed to affect sound. I have also had experience where the same brand power cord at one meter and two meter lengths sounded different. I wrote the designer who agreed, and recommended the longer length.
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