I ran out there with a tape measure, and in the back of my four-door s-10, to not have a ridiculously obvious box (dim: 44" W x 33" L x 16" H) cu in ran out to 13.4 cu ft. I could always make the box 24" H And that would get me out to 20.17 cu ft. But even 6 12" BLs would only require a max of 15 cu ft, so I assume 13.4 would be pretty alright. What about the low end response though? Am I gonna have to go louder to get a better low end response? And approximately how many sq in/ft of port space would I need? Or the equation to figure that out... All That ^ is all wrong. You are giving yourself an extra cf on volume somehow (I dont know how, but you did) and you are NOT into taking into account the sub and port displacement which would make your volume even smaller. Well, I calculated it out with 44x33x16 = 23,232 cu in divided by (12x12x12=) 1728 cu in to get the 13.4. Although I did some recalculations, and changed the measurements, to compensate for the space wood and bracing would take up in the box (1/2" plywood, braced with 2x4's) to 43" W x 32" L to 17" H (add 2" to height) to get 23392 cu in, divided by 1728 to get 13.53 cu ft. I figure shave off a cube for bracing and woofers, even a cube and a quarter and get 12.25, which is still in the midrange spec for a ported BL 12. And as far as port goes, I was going to have a wide port, added on top of the box, woofers would be on the sides, opposing each other. I'm not building this box to be an ultra-pro or anything, I'm going by specs here. In theory, this all works. And thanks for posting that chart, btw. It looks like I'm over the 2 18" mark, and I avoid some attention from the back of my vehicle looking like it has 2 satellite dishes in the back of it...
