so an altenator can help make it louder?

Head Unit... 7 Inch LCD Screen... Linear
Door Speakers (Front & Back)... Eminence's... rear at 8inchs, and I belive front is about 6.5 inches, I also have horns in the back that I use for mids
Subs... two jl audio 13 W7's... each hooked up to a 1000/1 JL Audio Amp.