Need help, want to build a dual 12 vented underseat box
 

Have 2001 supercrew f150. I am very able to build an encluser, but would like to take the easy route by hopefully finding some one who has done it already and could give me the layout. I have 2 cvr twelves. Min cu. Ft. Is 1.75 + port. max is 2.25 cu. Ft. +port

I don't think there is enough room for 2 kickers, I had the same issues with the comp r's you could do this, I believe its 1.5 sealed with poly fill. The poly fill helps with the small air space and it sounds pretty dam good. I don't know of anyone else that has done it this way. It takes a lot of ingenuity, fiberglass and balls cause once you do it theres no turning back..lol MTX makes a box for your truck but I believe it's for 10's.


https://cimg0.ibsrv.net/gimg/www.f15...2f275aef4a.jpg

https://cimg5.ibsrv.net/gimg/www.f15...905f4f4433.jpg

the poly-fill "fools" the speaker into acting like there is more space in the box, to put it in simple terms. I don't have my reference book handy, but I believe there is a formula to determine what size enclosed box with the fill you can make based on the speakers ratings.
Google might yield the answer for you