Hope this is the right forum for this issue. TV is Sony 34XBR910 which supposedly displays HDTV signals natively up to 1080i. Time Warner HDTV box can be set at 480i, 480p, 720p or 1080i. I had been using the 1080i setting for all signals, but began to notice that the horizontal bars on the ABC and ESPN HDTV signals were of uneven width...went to the 720p setting and bars were straight, I guess because ABC and ESPN transmit at 720. Questions....do I lose any PQ on 1080i HDTV signals if I set the box at 720p?...I don't see any difference. Are analog 480 signals really "upscaled" to 720p when the box is at 720? What is upscaling really? I didn't think a signal with a fixed number of 480 detail lines could somehow be made "better". What's going on here?