I don't know about the Magico but as a C1 owner I think your room is too small for the C4's. My room is 3.5m X 8m with the speakers on the long wall. I had the C2's for a while and it was a wall of sound. The 'wall of sound' was just too different for me in my room but at the dealer the C2's sounded so much better than the C1's. Granted the C4 is even better but really needs space to sound the best.
That's my personal opinion but if there is any way of listening to them first in a room similar in size I would do that first.
That's my personal opinion but if there is any way of listening to them first in a room similar in size I would do that first.