Best speaker design for low to mid volume?


I'm not asking brand etc. I have a condo that had a listening area (approx 20 ft X 15 ft). I'm looking at floor standers. Generally, should I look for few drivers or more the better? Some speakers are 2 way, 2.5 way, 3 way etc). I listen to everything from classic rock to jazz and classical. This is a 2 channel system. Some tv/movies will be played through speakers as well. I like full bass (not so much the very tight bass sound and too crisp sound I find with Klipsch). Please chime in...sitting area approx 7 to 10 feet in front of system. I'm not looking for bookshelf speakers (WAF).
aberyclark
03-23-12: Timlub
"It is not cast in stone, but generally multiple drivers give you higher sensitivity."

Is that true? When I think of Hi Sensitivity speakers I think of only 1 or 2 drivers. When I see multi drivers I think power sucking, sensitivity lowering crossovers.
Similar size room as yours and also in a condo.
My Eminent Technology LFT8 speakers sound great and balanced at low volumes. One of the things I like best about them. would think other planar speakers would be similiar . Bass is excellent on these speakers and is not lightweight. Though they do need some power I am using a Pass x150.
It seems many european manufacturers mentioned have quite a selection of very efficient and low volume friendly speakers. I wonder if it is due to the generally "smaller" living spaces that is so common in Europe?