A bit of an odd speaker, uses the PSD 2002 and the Kappa 15LFA, with a crossover very similar to your delta 4 pi... The woofer is in a box very similar to the one you used to use on the 10 pi horn (minus the horn obviously), with a Dayton 15"HO bringing up the bottom end and a built in 500 watt BASH amp in each tower to drive the sub. The mid and horn are passively crossed over on a conventional amp with a 60 Hz crossover.

Both 15's fit into a segregated box only 5 cuft in volume... about 3.5 for the sub and 1.5 for the midrange... Incredibly loud and still hits all the deepest notes... These are on their way to Burning Man in a couple of weeks.

P.S. sorry for the crummy picture, it's just on my laptop camera.

Adam