I'm running the LFM-2 - got it up and running last night in a 12 X 20 room and it's got plenty for my ears... My decision was based on that if I ever went to a bigger room I could go the duel sub route later by adding another LFM-1 or LFM-2. I'm running a Denon 4806 (140w X 7) thru Klipsch fronts and center with Bose sides and rears.