Im trying here but iduno. I have this space to work with: 7" deep, 22" wide and 22" long. I want the box to fit where the spare tire is. The spare tire is 27" in diameter (total) if that helps. I have 2 MTX 10" subs. They say they need .75cuft each but the box i made for my other car is about 1.3cuft total and it pounded. Forgot to say that the box will be sealed. I think the mounting depth is 6". I got the subs from Futureshop 3 years ago if that helps either.

 

Yeh figured it out myself thx