Digital processor

Does anyone know/use a digital processor between pre and amps so they can use the lfe output to their subs? Would this work better than a high pass crossover? Just curious?
I use a behringer FBQ2496 - it works fine - I just use it on the sub to add some room mode notch filters and that is all (as I run my speakers without any EQ.)
I think if you can find a Paradigm X-30 Crossover that was sold as a compliment to the ist generation Servo-15, that might meet your needs. It has been years since I owned one, but I am hoping an Audiogon'r might have a clear memory of it's full function.
That would probably be the most economical.
Mofi are you out there? You have/had one.