It's a 5 way system - 3 way speakers plus two subs. The master DEQX processor (HDP-5) handles the 3 OB stereo channels, the slave processor (HDP-3) manages the subs. All drivers including subs are calibrated using outdoor measurements and phase/time aligned across all frequencies.
The Beymas handle only 50-280hz. Transients, including bass frequencies are extremely dynamic & life like (much as other open baffle users would probably appreciate). The subs add a level of reality that is difficult to achieve with pure OB bass - something like a foot stomp within music sounds just like someone is walking softly in a different room above, more 'felt than heard'. I like (& need) that.
I voiced these speakers to sound somewhere between PAP Trio & Quintet 15s & having heard both types several times before/after building my own variants, I must say that I'm extremely pleased with the result.
The listening room is very heavily acoustically treated and therefore the only digital eq needed is a 34hz 3dB reduction @ a 3.8 Q to achieve in-room measurements as previously posted.
These speakers were finished early 2017 & were the 5th variant of OB I had produced. DEQX suits open baffle designs very well and I would class the last two types as sounding pretty exceptional. I doubt I will ever need to build anything else.