+1 on Charney Audio Concerto with the AER BD-3 drivers. Super efficient and awesome sound. Get a nice flea watt Set and enjoy audio heaven.
I have the Companions with the AER and a couple of SVS subs and could not be happier in my 24x32 ft with 14 ft ceilings. Gets plenty loud, even with my 1.5 watt 45 SET.
The Companions go down to 32 Hz. The Concerto goes all the way down to 20 Hz, so probably wouldn't need subwoofers