i have a 93 SC with jbl audio in it. im not really impressed, am i supossed to be? the sub sucks. is there any thing i can do to make it bump better or should i go for two 10s and an amp? this will take up a bunch of trunk space, add weight (dont want that ) and i dont know if i can fit it under that tray that has the jbl sub in it. and it makes my fold down seats usless.