I’m of the opinion that power cords don’t really alter the sound of a system, unless it’s poorly made or not of suitable gauge.
That being said, if I have 10k let’s say in my integrated amp and speakers, I’d still spend a few hundred on a PC just for peace of mind, knowing my amp isn’t being even slightly hamstrung by a cheaply made cord.
So I found an open box but new Audioquest NRG Z3 PC and replaced the cheap 18 awg generic that came with my amp. Cost me $175.
Do I hear a difference? I can’t really tell if I’m honest. But I feel better knowing it’s a quality cord, that is well made and heavier gauge.
I did the same with my speaker cables. Bought a pair of Worlds Best Cables ultimate. 7 AWG. Well made, shielded, robust and high quality gold plated connectors that are solidly attatched and make a very tight connection in their receptacles. I had a pair of AQ Rocket 22, I found the banana plugs to be somewhat flimsy and not a very tight fit, and I’m happier with my WBC, for 1/3 the price.
To each his own. I’d like to believe you can drastically improve sound by upgrading a cable. But for me, it’s just about ensuring I have a certain minimum standard of quality in the power cord and speaker cables so as not to have a weak link. And I’m super happy with my system.
It’s all relative I suppose. If I had a $500k system, sure, I’d spend a few thousand on higher end cables, why not?