I have not heard this specific one, but heard the floor standers. At the same time I also heard the Special 40 from Dynaudio. These should be good speakers for the room size you mention. And you are correct - these might need an amplifier that is comfortable driving 4 ohms load. With such a amplifier, you might be able to listen to this speaker at moderate volumes without overpowering the room with bass.
Hope people who have direct experience with these speakers respond soon.