It's been a while since I read the 950 manual, but IIRC it has adjustable xovers from 40Hz up to ????. 40 hz seems to be a logical choice for speakers that extend to 30 Hz, esp. if the SPL they can produce at that level is limited.

I like the concept of using the xovers in the processor 'cause I can twiddle easier and it also takes care of matching the low and high pass sections auto-magically.