I need help to build a custom box, I'm not sure on wat size to make my box to get the best use out of my subs... I have 2 audiopipe TXX-BDC2-12 an 2 boss ar2000m amps. Each sub on it's own amp. I'm goin to put them in a 2010 Dodge journey.. my plan is to make 2 separate boxes (easier to move...