In my opinion it's kinda hard to find a low profile 2.0 system.
However, depending on how steep your price range is. These Bowers & Wilkins Hi-fi speakers are really great for their size.
I'm not sure if thats exactly what you are looking for. But they can for sure fill a room. Depending on how big. Anything above 12x12 I would go for something for unless you have some kind of mic sending the sound through a PA system.
http://www.crutchfield.com/p_749MM1/Bowers-Wilkins-MM-1.html?tp=252&awkw=25834080745&awat=pla&awnw=g&awcr=6655935865&awdv=c
Other places sell them as well. Like Best Buy, Apple, Frys, etc