If you compare a $10 power cord and a $30 power cord, I doubt you will hear a difference, but it you compare a $30 power cord and a $1000 power cord there will be a huge difference. If your system is revealing enough. I have a Denon AVR (cheap) going to Klispch speakers. And I can’t hear any difference. I changed the power cord on my Hegel amp going to KEF Reference speakers and I can easily hear the difference.