Contrary to (un)popular opinion it has been proven through double blind testing, that without a solitary doubt, power cables do make a difference:
https://www.avsforum.com/double-blind-abx-testing-proves-power-cords-effect-audio/
https://www.avsforum.com/double-blind-abx-testing-proves-power-cords-effect-audio/
Recent experiments show that 100% of listeners were able to tell the difference between using an amplifier with a power cord attached, and without. The carefully screened and trained listeners described the power cords as ?bringing sound to the system? and ?the key to making this thing work.? The power cords were also described as ?familiar? and ?easy to use.?