Yes power cords can make a noticable difference. I have heard it many times over and it is not placebo because I have heard expensive cables which I did not like. The placebo argument is weak at best. Measurement in audio are insufficient to really explain what is happening. We can not measure everything we can hear.
Are manufacturer AC cables good enough?
I have two PS Audio AC3 and two Pangea AC 14 cables I don't use. My thinking is that Ayre wouldn't supply cables that are inadequate for their components. Is that thinking flawed?
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