AVS Forum Addicted Member
Join Date: Feb 2010
Location: Monument CO
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I would just go for good ceiling speakers and not worry about matching to the Maggies -- they really won't, but probably not a big deal. Coming from the ceiling will give a much different sound stage and image, but for Atmos speakers I suspect (do not know, do not have Atmos) they will be fine, especially since you are already well-Magne'fied for the rears.
When I had my main L/R Magnepans first set up I was using Mirage OmniSats as surrounds and rears. I thought their more omni pattern would suit the Maggies decently. However, I found the floor-to-ceiling ('ish) sound from the front pair just sounded overwhelming compared to the OmniSats. The little speakers just did not, could not, provide the same "presence" the big panels provided. I ultimately replaced them with MC1's and that provided a much better match and more immersive experience. I did not have room for more floorstanders, but mounted the MC1's on stands to avoid more holes in the walls and allow me to move them around a bit.
Having learned from my OmniSat experience, I went for floorstanders for surrounds and rears when I changed speakers last year, again to better match the fronts, and that has worked out for me. If I ever go Atmos (unlikely) I would just get smaller speakers to mount in, on, or near the ceiling. The very few Atmos systems I have heard (really only a couple of demos) used in-ceiling or small monitors mounted high that were very different than the main speakers. Because they add the "height" element I did not notice them sounding out of place. One thing I noticed about the in-ceiling speakers used was that they facilitated aiming the mid/tweeter drivers, instead of just being flat in the ceiling, and that significantly helped the sound.
FWIWFM - Don
"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley