Hi guys, I read all the discussion...
These are my empirical impressions that apply to my system; over the years, I've tried almost all the break-in discs (XLO, Purist Audio, Densen Demagic, Isotek, Cardas, Tellurium-Q, as well as the classic Pink and White Noise). Some have tracks that the authors claim 'demagnetize' the system, other tracks are for breaking in, others for a quick warm-up. Are they useful? Yes, especially on new equipment, speakers in particular. More than music? In my opinion, they speed up the break-in process. Obviously, I don't listen to the system while I'm playing these discs on repeat; I do that when I leave the house. Don't ask me if I know the isomorphic properties that connect what I hear to what the CD authors say, because I don't. I only have listening impressions.

