Steve, the M22s actually have a small edge in bass extension over the M3s(the enclosure is tuned a few Hz lower), but the M3s give an impression of more bass because of a hump in response in the mid/upper bass, as Murph described. My preference is the more linear response of the M22s.

Since you're planning to mount them near the ceiling, if you get a good sub to go with them(rather than "eventually"), I'd second John B's suggestion and propose that you use four of the smaller M2s.

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Enjoy the music, not the equipment.