ok heres the deal. my car came prewired and the mach 460 system was gutted. right now ive checked myself and this is wut i have noticed so far: the door speakers are pioneers, the rear speaker deck is gone replaced by two bloupunkt speakers, and the bass on my car is gone. wut i think is that the last owner had some subs in the back and he had the bass coming from there cuz the only place i get bass is the tweeters!! i mean the stereo gets pretty loud but there aint no bass!! so, im fixin on getin sum subs but im limited financially. the question is wut is up with my system and if these r any good subs (price, brand, performance). http://www.bestbuy.com/site/olspage.jsp?id=1069299397134&skuId=6221064&type=product