While a bigger room is better, 12' X 15' is sufficient for Maggies. Put them 5' in front of the 12' wall, and your listening chair 3' from the wall behind it. Because the speakers are to the left and right of the center line, that will put the chair 8'-9' (depending on degree of toe-in) from the speakers, plenty. Being a dipole, the speakers can be placed right up against the side walls, which will provide low frequency reinforcement, a fortuitous compensation for the inherent planar dipole front-to-back cancellation in the bottom octave or two..