iron man auto DRC audio problem?

[blu_fan]

i bought it the day it came out and just upgraded my sound system. it sounds crappy, quite frankly. very soft, explosions are tame, etc. even my Sorority Row track is louder than this...
i rented it on netflix and the disc art is different, but the sound still is very tame. it's at -10 on my receiver and getting clear dialogue, but special effects are some of the softest i've heard on a blu-ray. is there something wrong with my player? receiver? disc? it's really loud with other movies such as sorority row, transformers, etc. but with this it's very tame...please help??

also, what's the difference between the two discs? the one i have is darker blue with white text. the one from netflix is lighter blue with silver (the disc underneath the art) font. please respond asap.