Hi Charles,
For the 2x12 open baffle servo subs, the Rythmik A370PEQ is more than adequate to drive the SW-12-16FR servo subs. I am using the HX800XLR3 with the large 6x12 open baffle servo sub array I am building. You might ask Danny if the SW-12-8FR's would be a better match to the A370PEQ than the -16FR's in the 2x12's. If you were going to more 12" drivers the HX800 might be a better way. Each HX800 amp module is driving 3 - 12" servos in my setup.
The dspMusik is a 6 input (USB2, S/PDIF and A/D), 8 output DSP and HiRez DAC system. It works as both a digital crossover and PEQ system for the setup. I use Room EQ Wizard to make measurements with the MS-3 and dspMusik and then setup PEQ's in the woofer or sub processing. Time delay can also be added if needed. The user can make measurements and I can setup the PEQ's and send the block diagram for AudioWeaver to run. I use a Dayton Audio UMM-6 calibrated mic for the measurements with REW, as they are $85 and have calibration files compatible with REW.
There are other ways, but I have to see the processing power available in the MS-3 and dspMusik will handle it on a case by case basis.
A friend that records and does his mastering is using the dspMusik in his Home Studio with a pair of GR-Research N2X and TL subs with his Protools system with very good results.