Originally Posted by DownSideUp ➡️

That's doable, but they have fixed satellite high pass at 60hz or 80hz, then you'd have to experiment with the Sub Lowpass knob to match and align, and find the exact same position for the other one.

And all-in crossover would have been cool. Cut One15 at 120hz for example, with the sub auto aligned to take over.

I'd not mess too much with either the limited controls on the 9S, or the ad-da and dsp of the 18S (as DigitalGrease mentioned), but rather crossover with my interface's digital eq slots of the outputs,+ maybe phase, and sample delay.