I, like many here at the Home Theater Forum, still enjoy going to the cinema and have lately found my "home theater" away from home to be an AMC theater located in the Chicago suburbs. I enjoy this theather immensely for the large auditoriums, huge screens, great sound, stadium seating with high chair backs and fold-up armrests, etc. However, I'm wondering if there's anyone here with any knowledge as to why the huge screens are concave in shape and also I never see anything anywhere denoting which sound format they use, whether it's Dolby Digital, DTS or SDDS. Just curious as to anyone who works at an AMC theater would have any knowledge to these technical specifics. I looked on the AMC Web site to no avail.