The info at this link might be helpful. Other than replacing one to correct "inadequate" gauge, I thought power cords making an audible difference was silliness...that is, until I heard an unmistakable improvement switching from a Pangea AC-9 (7awg?) to a Shunyata Venom HC on a Class D amp. The "flat earthers" can rant all they want, I don’t care about convincing them. Decide for yourself. I like Shunyata. There are other options. Rent something (or some things) from The Cable Co. and try on power conditioner (a bigger impact than on the amp), or amp, pre, source, etc.. Experiment. Let your ears decide. Does a system have to be at a certain level of "refinement" for power cords to make a noticeable difference? Maybe. But I can only speak about my experience with my system which, on the continuum of audiophile gear, is mid-fi at best.
https://www.gcaudio.com/tips-tricks/why-power-cables-make-a-difference/
https://www.gcaudio.com/tips-tricks/why-power-cables-make-a-difference/