Had a guy over one time and it was all, Why do you do this? Why do you do that? How can those Cable Cradles do anything? Quick demo. Okay, that's amazing.
BUT, power cords? No way!
I went to my old cables drawer, pulled out one of my many freebie black rubber power cords. "According to you, this will sound just as good as what we've been listening to?" He could see what was coming but stuck to his story.
So I put another record on, plugged the freebie in, and let him listen. Then swapped the M101 Supernova back in.
And swear to God, the second the needle hit the groove he says OMG! Hadn't even got to the music. Still in the lead-in groove. That's how freaking obviously better it is.
Caelin Gabriel of Shunyata was here with a couple of his early Shunyata Powersnakes, half a dozen non-audiophiles who never heard anything like this before, every single one of them had no problem recognizing the improvement.
Wire is a component, okay? Power cord, interconnect, speaker cable. Any of em. All of em. Every bit as much a component as the amp, preamp, speaker.
The Caelin visit was 30 years ago. That's how long this has been true. At least. If not longer.