Problem with inception Dvd?

Hey im in india and ive buyed a inception dvd which has been manufactured by big home videos.. i dont know who is the manufacturers outside india.. The thing is that i am damn dissapointed about its sound quaility.. Its damn poor.. Ive buyed it giving Rs599 and im damn sad now.. Has anyone encountered any such problem in india or outside india.. Im using a home theatre system of sony dav-dz370 which if you know is a good i say a great system.. That dvd is having the worse sound effect.. Is it the dvd like that only or is it only my dvd like that??.. Plzz help.. Also mention who is the manufacturer of your dvd.. Plzz..