im looking to build a box for my two orion hcca 12.2's, im leaning more towards spl, but still want to be able to play music with it, dimensions i have to play with is like 20 for the heigth, 37 for width, and like 26 deep, and if i lay my seats forward i could go like 40 deep, if that would be better to get more spl outta the subs, wanting to go subs up port out the back, i could go with a longer deeper box if needed also just throwing in some numbers, what kind of port area do these subs like