This is a theoretical querry as I don't have a CRTpj yet! Potnetial setup: HTPC to Barco 801 or similar with PAL dvds 7-8ft screen. I understand that Line doubled video is effectively progressive output. Thereafter tripling/quadrupling is actually adding extra lines of image by scaling/interpolating. Am I right? However I've also read that the res I wan't to run at would be 800x600 for 16:9. Anything higher and the lines of the picture start to overlap and the picture becomes soft. So if I ran at 576p that would be fine. So what then would be the point of tripling/quadrupling if it spoils the image? Is line tripling/quadrupling for when you have a much bigger screen furhter away and scan lines would start to become visible? I can't visualise this as surely the point at which lines overlap is an inherent characteristic of the particular projectors theoretical resolution and how small a dot it can draw not how far away the screen is? I'll have to post on HTPC to find out how to go about tripling/quadrupling via PC as well!