Better off with two f112's, when the levels are set and dialed in, two subs will give a noticeable better balance. The potential is there for more boom boom to disturb the neighbors but if they are dialed in to blend with the mains and the levels are set properly two subs do not get louder just sound better. My room is 11x26x9, I had a f113 a couple of years ago, I think the two f/110's I have now are a better balance in my system with Focal 1037 BE's. I just do 2 channel music, vinyl and CD.
Mike
Mike