4th order BP for 2 obsidian 12's. Gonna be running them off of 1800-2500w (1800w for daily 2500w for burps). Box is roughly 2.1 cube sealed (1.05 per sub) and 6.9 ported (or ~3.5 per sub). Port is 101.5 in^2 tuned to 40hz and uses a 4" kerf to help against any port noise. I didn't like how close the subs were to the port so I put in some big 45's to help prevent any dead zones. The setup is NOT built for competing, just going for a loud daily. The box will also be braced with several pieces of 1/2" threaded rod.
There's a typo on the sealed section, it's supposed to say 2.1 not 1.05.