Dedicated lines- need break in?

Yes, your new lines will have to break in. They will sound good right from the start, but will sweeten after a couple of weeks. It is hard to tell though, since it is usually hard to "switch" back to the old hook up system.

Well, Schipo, the devi's advocate, (which I enjoy playing too from time to time.) I really didn't want to define all the ways the above system could improve over a couple of weeks. But from lots of experience with this phenomena with my own personal systems and with several friends systems, I know that it happens. I used the word "sweeten" not in a sugary sense but that things would get better as the cables/wire/outlets/components all broke in. (I've helped friends (besides myself) run the wiring and I heard what their systems sounded like both before dedicated lines, then the same afternoon the dedicated lines were run, and a couple of weeks later after the outlets and wiring "broke" in.) I can only state that I'm not used to embellishing the truth of my audio experiences and the results were quite worth the bother of running the extra lines across my friend's and my own basements to enhance our systems. In fact, so worthwhile have I found it in my own system, every piece of audio equipment I own has its own dedicated line. I think I'm up to about 25 lines now. I'm sure the above system will sound "sweet" when everything has settled for a couple of weeks.
If you have never tried it yourself, don't knock it. However I can readily understand other's scepticism as to the effect of "breaking in" wire or other components. I just know it does occur,(and have at least 30 years of experience to back it up) and like many others who have posted after me, would not make any other changes until the system has settled in.