I have not heard the X-2s, so I cannot specifically comment on them. But, as a general observation, one cannot determine if a speaker will work in a particular room just based on the size of the speaker. I've heard lots of big speakers work well in very tiny rooms.
I do know that the X-2 is highly adjustable so that the speakers can be made to align and focus at a range of distances. That means that one is not forced to sit in a narrow range of distance from the speaker. It is therefore not physically limited to playing in a big space with the listener well back of the speaker.
Oviously, a speaker with limited output cannot be made to play loudly in a huge room, but the reverse situation -- a big speaker can play in a tiny room -- is a different matter. In that circumstance, whether or not a speaker can play "small" has to do with whether it resolves properly and has proper dynamics when it is asked to play at lower volumes. A lot of speakers, big and small cannot properly do this. They sound lifeless and anemic at low volume. I have no idea if the X-2 is one of these, but one cannot tell by looking at its size.
