I have M60s in a 13' square room, and they're not overkill.

My very first post to these boards was questioning whether or not the M60s needed "room to breathe" and I was told they don't. I've found that they can crank of course, but also play delicately when needed.

I think the M60s, M22s, M3s or M2s could work in a room that size, the decision being based upon budget and preferred sound.

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::