He also has another pair of speakers that are a 3-way DSP crossover design working as well with the same dspNexus 2/8.
Besides the crossover it also allows room bass management at the listening position. Also gives the time delay for the main speakers when he adds subs. It works with REW for room measurements and you balanced powered measurement mic with calibration file.
It is also a DSP control center with preamp capabilities with remote control for line level or RIAA Phono inputs. For digital it has XMOS Asynchronous USB2 audio and S/PDIF I/O.
So for me, I use it as the entire analog front end, DSP crossover with frequency response correction for the main speakers and DSP processing for my OB subs.