OK, Iam going to build a box to put a POWERBASS 3XL-15D! Here are the box specs str8 from pb! I would also like to add a sub in a couple months so Ineed a temperary box, or a box that can be built on to! I have a full size Chevy van, room is absolutely no problem! So, please help me figure out what kind of box I need! There's a 1-15"sub box in the for sale section, but I don't think it would be big enough, but maybe, so if anyone could help, IT WOULD BE GREATLY APPRECIATED!!!!!!!!! ~Rob~