On my amplifiers and pre amp I have found some subtle differences when using well built and shielded power cords, say Cardas Clear. Others may disagree but most high end connectors have very subtle differences. Almost any power cord is a real improvement over what’s bundled with the packaging. Amps/Pre/Speakers are most important and deserve the best followed by the rest if there’s a resources allocation need.
However all power cords are coming out of power conditioners and that’s key.

