So I finally am buying some decent subs and I bought two level 2 15s I have a 05 scion Xb with the back seat in it still I have modeled up boxes on Winisd it's my daily driver but I also go to spl comps so I want it to play loud and low. Open to anything just lookin for help I was thinking 4th order but I am confused about cubic feet dc says 3 per on there site I have a mb quart 2000.1 and dual 2 ohm subs thanks a lot for the input