I'm slowly getting all this HT stuff after playing around for a week and also do a lot of reading here. A couple of things are still confusing. When my receiver spots a Dolby Digital signal on my satellite dish the receiver display indicates that the L C and R speakers have signals plus the SL, SR, and LFE speakers. There is also a red display of the word "DIGITAL" and I think the Dolby sign next to it, maybe not (poor eyesight). There are other channels where I see the red DIGITAL word displayed but only L and R are indicated on the display. What is this ? HBO East has it while showing Sex In The City. If it is a digital signal why would it only have two channels of audio? Also, even though the display indicates only L and R, I do have audio coming from the center speaker as well. It does say Prologic II on the display, so this is distinct from DD, again why only two audio channels? Additionally, I have other channels that the display indicates Pro-Logic II but the red "DIGTAL" word is not present. So, what is the difference between Prologic II and Proglogic II with a "digital" presence indicated on the display ?