It's a square box with one corner cut off. The square sides are 2' long, based on this is the rest of the dimensions . The closed box serves as the back chamber of the horn. The driver is JBL2245. Basically, the volume in the cone of the driver for front chamber, with the corner piece (deflector), the space between the box and the deflector makes for the horn throat. I use Behringer 3400 for active crossover, no equalisation yet.