To be fair, if I had enough cash to own a $100,000 or $250,000 system, I sure as h.ll wouldn't use the stock power cable (or speaker cables for that matter). I'd spend hundreds or thousands on replacements. If anyone ever asked me if they made a difference, I'd say, "They sure do." I might even convince myself that I hear a difference. If someone tried to tell me that I only think I hear a difference, I'd tell them to listen for themselves or STFU. I might even try a set of those wooden knobs. (naaaah....)