Cable Burn In


I'm new here and new to the audiophile world. I recently acquired what seems to be a really high end system that is about 15 years old. Love it. Starting to head down the audiophile rabbit hole I'm afraid.

But, I have to laugh (quietly) at some of what I'm learning and hearing about high fidelity.

The system has really nice cables throughout but I needed another set of RCA cables. I bit the bullet and bought what seems to be a good pair from World's Best Cables. I'm sure they're not the best you can get and don't look as beefy as the Transparent RCA cables that were also with this system. But, no sense bringing a nice system down to save $10 on a set of RCA cables, I guess.

Anyway, in a big white card on the front of the package there was this note: In big red letters "Attention!". Below that "Please Allow 175 hours of Burn-in Time for optimal performance."

I know I'm showing my ignorance but this struck me as funny. I could just see one audiophile showing off his new $15k system to another audiophile and saying "Well, I know it sounds like crap now but its just that my RCA cables aren't burned-in yet. Just come back in 7.29 days and it will sound awesome."
n80
I’ve noticed something, too, over the years. That is naysayers and skeptics tend to construct detailed, layered arguments to try to discredit or dismiss certain controversial ideas, products or tweaks. Cables is obviously just one example. And it’s the same ones who pop up on all of those threads. You could say it’s an excersise in the art of debate or the art of philosophical argument. But at the end of the day it’s simply what they choose to believe. I’m giving them credit here for honest debate, but even that is often in doubt. I’m not saying it’s not OK to have a gut reaction to something, but to build a whole philosophy around it? Hel-loo! I don’t think you’ll find any super skeptics suddenly changing their tune. Even with considerable evidence to the contrary from all sides. What would they say to the other super skeptics? I mean, come on!
Wind 'em up and watch 'em go!  If only a fraction of this energy was spent solving actual problems..

I've been experimenting with hifi for a few years. At first I felt the need to reject all the dubious ideas, like tweaks, fancy footers, cable burn-in, contact enhancers, etc. Then I pursued all these things avidly. My current feeling is that all of these things make a difference, but not so much really. 
@n80 Check out http://ielogical.com/Audio/#ConnectorCleansing and  http://ielogical.com/Audio/WinterBlues.php for just some of the things that can affect systems on a day to day basis.

The universe runs on math.

If I have a preamp with a 1KΩ output impedance driving an amp with 10KΩ input impedance does that mean I need 10x as long if I drive an amp with 100KΩ input impedance.

What happens if I use DC coupled vs AC?

Music varies greatly in frequency content. Will burn-in playing Joe Bonamassa sound different than if I play Birth of the Cool? The electrical energy vastly different so if playing in has any validity, content must matter. Burn-in with Pink / White / Brown noise should affect the sound IF there is any validity to burn-in requirements.

Cable direction, other than cables with networks, is nonsense.
Cable burn-in is most probably 100% nonsense.