I agree with those who suggested smaller main speakers plus subs. Acoustic suspension speakers generally control bass better than bass reflex (i.e., ported) speakers. Also, my experience is that (at least) two subs can be integrated better than one. If the type of music you enjoy has significant low frequency content then I would definitely include the subs.
Am I Better Off With Limited Low Frequency Speaker In A Small Room?
In my 12'x12'x11' room, am I better off with limited low frequency speakers, such as those which only extend down to 40-50hz, or will the mere introduction of a speaker that extends down to 35hz be potential for trouble (The extent of my knowledge is that lower frequencies need larger spaces to truly breathe, and the wavelength goes up exponentially). My listening space is my living room, and there's not a lot of space for room treament. I'm auditioning a single GIK Soffit bass trap. I'm not sure how much it will help.