I do not believe power cables have any effect on sound unless your ears are so sensitive that you can detect minute changes to your system. I'm 1/4 deaf in one ear so I don't fall into that category
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I have two components without power cables at all and two that came with what look to be unshielded so I wanted to find some of good quality. I do like pretty cables but won't pay much more for them. I am looking in the under $50.00 range. Thanks!