DSP7200 has a rear-facing port.

DSP8000 is a closed box design with 3 enclosures, 4 DACs (2 for the tweeter, 1 for mid, 1 for bass), 5 power amplifiers.

The EBA handles the bottom roll-off which is common to all woofers. Each bass amplifier has individual characteristics which means you can think of it as a 5-way design.