My only concern is that by installing the speakers in the ceiling most of your typical listening positions would be quite a big angle off axis from the sweet spot. Because of this, you might find that you need considerably more amp power than you think to achieve a 'nice full sound with some bass' as you put it. Actually the bass itself is normally more omni-directional so if anything you might get an overly boomy sound lacking in mid-range and treble presence.
Is it feasible to mount the M3 in-walls, well, actually in the walls instead of the ceilings?
