7.1 adds only a little bit to the surround mix, but once you hear it, you'll never go back. On the DVD of Peter Jackson's King King, the scene where the girl escapes the smaller dinosaur and crawls into the log only to be approached by the two giant centipedes is amazing in 7.1. You hear these little squeaks and claw sounds from the rears as they crawl toward her. It's terrific. It made me turn around and look to see what the cats were up to in the hall behind my HT room before I figured out what was happening.
