Ok, I have had 2 15's in a 7 cube box in the trunk. I am looking to redo it to make it cleaner and alot louder. I am thinking 3 15s in the trunk(2 firing rear one up). And i plan on having 2 12's inside the cabin splitting my rear seat(one firing angled up the other almost verticle twards the front).
My questions are would the two 12s even add to the db substatially? Or would they just be a waste?
Im looking to spend about 6-700 so any ideas i will look at.