I'm hoping that some of you can clear up some questions I have and some gaps in my understanding of the various sound mixes: MAIN QUESTION: What's the difference between theatrical DTS/DD and DVD DTS/DD? OTHERS: Why are there no SDDS DVDs? Is THX EX 7.1? and why are there no DVDs in this format? Also, which movies have been released theatrically in the THX EX format (if there are too many, dont bother)? Even though I'm unclear on a number of issues, I know that DTS/DD differences are misunderstood by some HTers, like OAR is misunderstood by J6P. But for me, I will be motivated to buy which ever version of a great movie, by which mix I heard in the theater, and if it was really good. Even if the same master is used to produce both DVD tracks, I just want to recreate my theaterical experience as accurately as possible - that includes the psychological comfort of knowing I'm listening to the same mix? Nevertheless, I'd love to know if there are any fundamental differences between theatrical and domestic sound presentations, there by clearing up any questions in my mind, about accurately recreating the cinema experience at home! Thanks. Paul.