I have two alpine type swr- 12d2 which is going to be power by a hifonics zrx3000.1d r. It's a honda crv 2007 in te back area which I plan to have in a port dual sub listening to primarily hip hop. The maximum room for a box is either 30' x 30' x 10'(10 is with this top thing on but I could go higher" or also the other measurement is 40' x 40' x 10'+. I'd rather buy a box legit for these rather than pre made ones. Other helpful info is that I live in Alaska, I can spend 100+ plus but really don't want to spend more than 200+. Hopefully I posted this on the right form.