A guy suggested a nice box in another thread of yours, why not just build that? I say if you can fit about 1.3 NET per sub, and tune mid 30s or a bit lower(higher isn't necessarily a bad thing just exhibits more excursion control around the tuning frequency), then do that. You don't need tons of port area. It seems small by everyone's standards, and I'm sure they'll say it will sound like ***, but I'm sure it will work, be loud and you'll like it. I ran a 12 in 2 different test boxes, one was about 1.75 gross(36hz), and the other was about 2.4 gross(32-34 hz). There wasn't enough of a difference between the two to justify the size difference.