Does Power Cord Require Burn-In To Sound Good?

Really hate to tell u this I have several wireworld power cords sitting around because they really don’t do much to improve the sound of my systems
their interconnects and speaker cables are much better than their cords
in the pass I have replaced 400$ wireworld cords with 99$ Shunyata venom and the difference was more than noticeable.
Power cords do need burn in for sure
now I have moved from venoms to more expensive shunyata cords and they just keep getting better! 

There isn't any physical process that causes any modifications to the marcroscopic or microscopic structure of a cable during what you call 'burn-in' .
Cables burn-in does not exist.

" There isn’t any physical process that causes any modifications to the marcroscopic or microscopic structure of a cable during what you call ’burn-in’ .Cables burn-in does not exist."

-- Ok, we finally got the word, no sense in talking, debating or experimenting anymore. I wonder what other absolutes we might be enlightened to, can’t wait.

It could be that you just didn’t spend enough money for the placebo effect to kick in. 

There is no sound difference from power cords other than what you imagine you are hearing. Signal cords yes due to capacitance. Power conditioners help isolate noise but most pwer supplies do that anyway.

Invest your money on better amps or speakers or DACs. Buy a good quality 12 AWG IEC power cord from Amazon for $12.