Having spent several years at this game like most of you - trawling for the most useful bits of information - the one brick wall I have come up against is the aformentioned topic. Scanned all the threads over at AVS and TT forums, and even though I thought it was clear at one point I have disappeared into a bundle of illogic. The way I have read it is that a PC type display (I am assuming LCD is included in that) can deliver PC levels, 0-254. Media center equipped with the NVIDA decoders supplying VMR 9 can send Video levels across my HDMI connection. THe crunch comes is I don't understand why the calibration is using DVE where you increase WL & decrease BL to fit the video levels of 16 & 235, is any different from using AVIA to calibrate my system. It begs the question, how does this influence my chain? Should I make sure the graphics card ouput/tt video controls are default? And only adjust my display device? It's never clear in all the threads how you manipulate your HTPC source to deliver PC levels or Video levels in the first place. Secondly when calibrating for video levels, you then use the MCE calibration window and find that the white-level check is showing data at 235 and above as crushed meaning that you have to lower your white level back down to where you previously started. On top of this - the Z3 has two HDMI/DVI settings confusingly called standard and enchanced. Enhanced always appears to have better contrast (and my meter readings support this) but seems to crush black a little (unless you adjust your graphics card). Standard shows the full 0-254 range but lacks contrast. Can anyone offer any additional clarity on this subject listing whether they adjust the graphics card/TT/MCE settings for video levels over DVI.