I designed this box for my buddy and need to know the port length, te port is 8" tall and 13" wide, im wondering do i do 13.5" physical length or do i do 22" long port length? it has 1 common wall. Also it's for 4 pioneer premier champion series pro 12's, he has 2 already on a soundstream rub1.1600, he will be adding 1 more amp and 2 more of the subs.
This is what I came up with, 37" wide x 20.5" tall x 29" deep, plexi window and 6" of space from his rear hatch to the port.
Here's my Torres shit