hi i just recently purchased a used box just normal dual 12' box i use to have a dual ported box and before that a custom normal dual box and those 2 sounded fine but now i got this new box my subwoofers sound like there not hitting hard at all i dont know what to do there making a funny noise and there in there tight in the box so i dont know what it could be i didnt do anything different that i have done in the past so i dont know what it could be any ideas? i know it