after getting TV's and rims, and lowering my car i want to add a enclosed sub in my car. i've had a system in all my cars and the free air subwoofer sounds really loose. i have some subs that i already have to chose from. i got a infinity 12 and about 3 clarion 12's laying around in my room still in packaging box. i need to put them to good use. is the head unit connected to an amp, and then the amp is connected to ALL speakers? or is there seperate amps? or is the HU conenct to the speakers and then the amp is connected to the sub? where is the amp located? any model number or specs on anything will be appreciated. oh BTW it is a non-mark levison system. thank you