Have a prototype of the dspMusik digital crossover for the Magnepan MG3.6 speakers running. Had an enquiry about it, so did one from the manual's specifications.
The MG3.6 is a three way planar, but only requires a two way crossover for the way it is actively biamped.
Many years ago had the passive external crossover for biamping my MGIIB's with a pair of Hafler DH220 and later ADCOM GFA-555 amps. With a little EQ from my Hafler DH160 EQ, sounded pretty good to me. Can do that so much better now with the dspMusik.