There's another reason to go with dual subs: depending on your room and placement, you may get smoother response without equalization.

FWIW, I just ordered a pair of LFM-1s as the first step in a major gear upgrade - pretty much everything is getting replaced. I do this for a living (see http://www.hometheaterwatch.com), so there's a good chance something better will come along on a "long term loan" or "review unit pricing" that will eventually replace them. But in the meantime, the LFM-1 was impressive enough at the HES show in NY with material I know well -- and inexpensive enough -- for me to pull out my credit card. My review of the show will be up on Secrets shortly(http://www.hometheaterhifi.com).

-avi