I agree totally!!! As a proffesional electronics engineer i think i am sufficiently qualified to speak on the subject. The only way a power cable could possibly help is (a) if the existing cable is faulty and/or presents a high resistance (not thick enough) or (b) it incorperates some sort of filtering which may help if the supply is particularly noisy. That said, how good is your equipment if it has insufficient mains filtering built in?? All a mains cable does is carry 50/60 Hz ac mains the last few feet from the wall socket (undoubtably fed with unscreened copper wire) to your equipment. It carries no audio frequencies at all, the only current variation would be in the case of an amplifier and that would simply be a rise in current with volume. Provided the mains cable can carry this without significant voltage drop then it is as good as it can be. Most domestic amplifiers are only a few hundred watts at most and the current drawn from the mains will only be a few amps and not likely to induce significant voltage drop in the standard mains lead. As for claims of 'a wider sound stage' etc, check out this link http://www.pitt.edu/~dash/type1620.html#andersen
