tweeter huh? what are they asking about say over 1000$? , i'm guessing you are going to run the speakers off the head unit and the two subs off of the amp? make sure you check prices online for the amp and subs and headunit before spending your money. But to answer your question...the JL 500x1 amp is AMAZING(if thats what they want to sell you), and i think it will put out more powere than the 12W3 can even handle...it;s a good combo though(JL makes the subs, and they make the amp to make the subs sound good...also, the guy who designs the amps for JL is the guy who designed the amps for xtant, which is a very high end product) You should do some research on the head unit, some people have bad things to say about all brands so maybe asking around about panasonic will change your views...i'd reccomend clarion for head units....other people will tell you they suck.