Does Power Cord Require Burn-In To Sound Good?

I don’t know what the return policy is, but assuming it’s 30 days, leave it in your system for 2 weeks, listen to a lot of your favorite music and then switch back. You should have a very good idea of whether you’ve improved the sound or not after that. But definitely give it a chance.  And remember, it's not about which cord is "better".  It's about which cord you prefer sonically in your system.  I had a Wireworld Aurora in my system for a while, but I found my old Black Mountain cord sounded better, so I packed up the Wireworld for another day. 

@ryder Welcome to the world of audiophile hyperbole, where even the direction in which a fuse is inserted in its holder can make the proverbial "night and day" difference.
Honestly, the more reviews and posts that you read before actually experiencing an A/B contrast with your own ears, the more disappointed you are going to be by the often underwhelming nature of the result of swopping B for A.
There *are* big differences in this pursuit, typically between two quite different speakers or two quite different amps.  There are plenty of other differences too, but they're on a spectrum from modest to small to minimal to barely perceptible.

you will never get agreement here...use it a few weeks and you will know...

Hi, i think if you don't hear any good things from this, it's either because it doesn't match the unit's sound character (and maybe technical aspects), or because, you have already reached the maximum possible improvement a power cord can give to the unit, already with the previous cord! 

Roberjerman is the only poster so far who has contributed anything remotely useful to this question. You guys really need to study some basic physics, along with ohms law and a chart on wire gauge and it's resistance rating per 1000 feet. Then measure the length of a typical AC cord supplied with most audio gear.