ur prob is the car............i sold my sys to a frnd and installed in his cultus, and in my car u could feel bass outside coz it's mehran........and in cultus u really could feel bass outside...coz the car has some cabin prob...........to this some ppl would start to tweek and say, box was not tuned, not gud , proper settings would do..but it was all my same setup which i sold to him.......and everything was tuned............