I just popped in Heat and watched about 30 minutes this afternoon playing through my surround system. Actually the sound mix is very good even compared to some DVDs that are being released today. The ambient noises in scenes were excellent. Off screen sounds such as phones ringing, CB radios going off, hospital and restaurant noises etc... all sound very realistic in the side and rear channels and I had no problems understanding the dialogue coming through my JBL EC135 center channel. It's possible you have a some kind of DVD with remixed sound but I'd guess it's more likely a result of one of the things I mentioned in my previous post. Could just be your TV, DVD player or sound system setup.
brad cook