It's not just Quattrons, it's any HDTV, and it's not so strange if you understand mfrs tolerance levels. Besides, calibrating a tv also takes into consideration the viewing environment. And everybody's viewing environment is different. The commercial disk are WoW, DVEssentials, Spears & Munsil, etc. You can download for free the AVS HD709 disk which is what I used. I don't have the link handy but I'm sure someone will post it.