4x AQ 18" HDC's in a 4th order BP with adjustable port. Each sub is seeing 2.75ft^3 sealed and 5ft^3 ported. The port is removable and can easily be rebuilt for other tunings and port sizes if desired. This would make it easy to have a higher spl tuning for burps and a smaller, lower tuned port for some ferocious low-end output. The box is picture with a 46hz port.

I figured I'd at least get some dubstep hate in here.