except for my KW-181's the out is full range...
I don't know if you have any x/m-32 product but you can use the matrix as a crossover and it has a good selection of filter types. I have found that it is beyond the abilities of many of our techs and it makes them uncomfortable. However it works great. I am sure some of the other boards have it I think I have seen comments on the A&H low end, I know the Advantis does not.
Another option I have found that tech's are comfortable with it is the LCR on the X/M-32 they use the C out for the subs. You always can burn a mixbus for aux fed.