Alright well let me start off by saying that I am building a sub box for my Nissan Titan in the very near future and it will be a wedge shaped box going under my rear seat (crew cab). Now I used the calculator on the rockfordfosgate website to get my cubic footage for the box and with the dimensions I put in I got 3.75 cubic feet. Now my question is, is that enough to run either 2 10" or 2 12" nightshades? I would be powering them with a 2500-3000watt amp if it makes a difference. What do you guys think? I can maybe squeeze out another .25 Cubic Feet to make it a 4CF box but I can't go much larger without it sticking out past the seats. Thanks guys!