I am very happy with my Thiel CS 2.4's They only go down to about 30 hertz according to specs, but the rolloff is very slow- so you could be at about 27 hertz, with barely any sound differnce. I have a similer sized room, perhaps smaller. The Thiels require lots of power and have a low impedence, around 4.0 ohms, down to about 2.9-3.0 ohms.
cheers
cheers