the way i do my systems is i get all new speakers first and deck. i have pioneer tweeters, pioneer 5.25in front speakers and 6x9 kenwood performance series in the back hooked up to a 1200 watt SPL amp. get the speakers first then the subs. the speakers are like the "underwear" of car audio. need your underwear before you put your jeans on. thats how i look at it