6th order design questions

Well, I'm planning my next enclosure to be built next spring/summer and am attempting to design a 6th order bandpass. Needless to say, I have no idea what I'm doing and have a lot of questions.

1. Port area of the smaller/inner chamber. What should I aim for with 2 12s?
1 1/2. Port area of the larger chamber?
2. Tuning of the smaller/inner chamber. Higher tuning or lower?
3. Multiple/single ports. So far, my thought is to have each sub in its own 1 cu.ft. chamber with the port on the outside edge of the box and then a 4-5 cu.ft. common chamber with the two smaller ports firing into it and a big center port. Would this design have any advantages over having a single smaller chamber for both subs?
4. Chamber volumes - what size should I have each chamber be?

I have approx. 30"x37"x15.5" (DxWxH) to work with, may be able to increase the depth.


Sent from the depths of hell