OK.....so do the new Series 4's have 2 digital tuners in them or can they handle 2 separate HD cable inputs? I have discovered that I get basic HD on all my TV's w/o a box or cablecard. That being said, and if the 2nd input on the Premiere's can handle Digital HD OTA signals, why can't that second input come from one of my other TV's? I ask b/c I'm able to watch different HD shows on different TV's in the house. So why couldn't the TIVO handle 2 different HD lines regardless of where they come from? They're both digital. It's just that one is OTA and one is from the cable co.