I want to sort the sounds in the st24, currently i have upgraded the front stock 6x8's to 6.5inch Kenwood components with passive crossovers, the speakers are very good quality, but still running the stock 6x8's in the back door cards, whcih overall doesnt sound to bad but i want to get some nice quality bass, i dont want a sub really, i was thinking maybe put some 6x9's in the door as iknow they fit, but wasnt sure if there was enuff space/air for them to be effecient, and really i wasnt sure whether 6x9's would be a good choice, can some one recomend a way to get some bass in the car? i dont want car rattling bass or anything just want the sound to be crisp hope that makes sense