Subwoofer reccomendations for B&W 805S?

Does anyone where the crossover occurs for the 805s? Also if I was going Bob's route, what sort of "active" device would I need? I am new to all of this. What are the pitfalls of going this route? Also isn't bass at say 100hz still directional?

Nemesis

I pulled the specs for the 805 and I don't believe that B&W quotes a crossover spec for these speakers.

The active device between pre and power amp is an active crossover (like the NHT x-2 I use) that allows you to divert the low frequency info from your main amp (and the 805s) to your sub(s).

As I noted in my post, if you move your crossover frequency much above 100hz, you should use 2 subs run in stereo.

Marty

As I said earlier in this thread: The Rel Strata III is a great sub with the 805's Great deals can be had on Agon.

I heard the Paradigm Sub One. I was amazed at the clarity and slam. I liked it a heck of a lot better than the REL. I think it is more expensive however, but both are in the rarified air.