Yup.
Oh, and for those people thinking that the "reflection" model would be an easy way to not cut holes in your ceiling, it doesn't work with non-flat ceilings (no vaulted ceilings) and there is going to be some sort of low and high height limit. Plus you are talking about sound waves going up, and then bouncing down. That makes for pretty diffused sound, not something that Dolby Atmos wants to really portray to be accurate.
I say that 4 IN/ON the ceiling is the only way to do it right. Then again, I would have to toss a few grand at this with a minimum $1500 or so going to a receiver to get the Atmos processing, and the rest into speakers. ($880 for four M2 on-walls, or $996 for M3 on-walls)
