I use one LFM-2 in my bedroom system.12'x 15' x9'. I didn't want to spend to much money on this system. I found the outlaw LFM-2 to be the best value. The sub does the job with ease. In your size room I might think about the LFM-1.
FYI: This system consists of 4 dayton 8" ceiling speakers, 1 dayton 5 1/4 mtm in wall speaker. 950 pre/pro, oppo dvd,5 IRD mb100's,various cables. The sub (LFM-2)sounds great in this system.
I use a SVS 16-46 PC PLUS in my main home theater and would have bought 2 LFM-1 instead if available at the time for about the same price.
I have had good dealings with SVS but love the OUTLAW products and service. Good luck.