How To Add A Sub To B&W N802's

sorry ASW850 not AWS (typo)

I been looking around and it seems a used AWS850 will be much cheaper and do about the same as the 855

Thanks I am interested in the 800 series of subs from b&w but I do not even know if it is a good idea to add a sub or if it is how to go about it. I pretty much got the sub picked out already.

yeah I feel like I am missing that slam. I listen at very loud levels and my room is fairly big but who knows how long I will be in the same room. I read it is a good idea to get two subs for stereo listening but I really don't think I can do that finincially right now. I will only be using this for streo music by the way in case that helps with the replies. This is kind if embarrasing but I don't even know how you would hook up a sub, do you hook it up to the preamp or what?

Shadorne I do not even know what bass managment is. Honestly I never even though about a sub till recently but at first it seemed like a good idea instead of upgrading the speakers which would be very costly. The sub I am looking at retails at $3500.

yes this is confusing but I appreciate the replies :(

that does sound sensible to me about the sub just filling in the bottom.