Originally Posted by marauderroy
If the speakers in your door are "blown" replace them with a set of Infinity speakers and install a set of "Bass Blockers" with a cutoff at 150 hz. You can find everything you need at the crutchfield.com website plus lots of useful info. They have a good site and you call always call them for help with your install. The amp and speakers the car came with are top notch but there is no cut off for the door speakers so the bass is too much for them. With the cut offs you can turn up the bass and really make those subs work! I have installed the cutoffs in my car and it really makes it sound great. Hope this helps. 
Curious what level do you set your bass and treb? Thanks.