Before I make a mistake. Actually, I'll just do this, so don't bother.

D123 in 3.3 cubic feet tuned to 30hz, .33mH inductor for low-pass.

PT2C-8 Ribbons ( http://www.partsexpress.com/pe/pshow...75-085&scqty=2)

4.8uf for hi pass.

XO is estimated at 4500.

I might buy a few extra caps and inductors and mess with the XO outside the box, and I'll be able to passively bi-amp with a T-amp and a tube amp. Sounds like a good way to piss away a few weeks...