JL audio subwoofers users do you use crossover?

I just spoke to tech dept. at JL audio and found out that their subs don't have a high pass signal output that would go to the power amp feeding the main speakers.
What do owners of these subs use for the signal that feeds the amps to the main speakers. Obviously you can't have the main speakers producing the low bass that the subs are designed to.
When I asked to recommend a crossover they mentioned DEQX. But this is a digital x-over, I am using a tt and would prefer to keep digital out of the system, what is recommended?
I thought it would be great to have a sub with a high pass, just like other brands do, but JL told me they are not going to go there. Any comments, is that better to have the x-over away from the sub or in the sub.
My Martin Logan has a high pass and I feel it is very good, but after reading about JL's subs it is tempting to try them out.
Nelson pass made a x-over that is supposedly very good, but it is pricey.