Dolby states the ceiling speakers should have a 45 degree dispersion pattern from 100hz-10khz if one is to face them directly pointing down. I'm currently using klipsch rb 10s for atmos speakers. The horn has a 90x60 dispersion pattern, obviously, at very high frequencies (greater than 16khz) they become beamy. I'm trying to get the best coverage for a wide seating area. I haven't measured off axis response yet for the rb 10s, but I know the R-15ms, which have a 90x90 dispersion are relatively flat to 16khz up to 90° off axis.
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