Ditto to Retep's comments.

I have the LFM-1 Compact on my RR2150 system in the Kitchen/Dining area which would be the size of a large bedroom (23'x13').

I use it just for music and it made a noticable difference in the sound of the NHT SB-2's I have. What I love about it isn't the boom but the way it gives a solid foundation that wasn't there before. This is particularly noticable when listening to recordings of a piano. FWIW, I cross it over at 100hz.