If you read the Dolby Atmos home theater paper, it states that ceiling speakers should have a 90 degree dispersion pattern out to 10khz. Many have commented with woes finding a speaker with such a wide pattern, necessitating aiming of speakers and a fairly narrow range of decent seats in a home theater.
Since Klipsch gives a 90x90 dispersion spec with their speakers, I decided to test out whether or not they could meet atmos specs.
I mounted an R-14m speaker flush to the ceiling, and placed the mic 45 degrees off axis vertically and horizontally 6’ away, and ran a sweep up to 20khz. A 3ms window was applied to remove reflections from the measurements.
Oddly enough, the windowing caused a strange jump around 600hz, which should be ignored.
As you can see from the graph, the speaker manages -3dB off axis all the way out to 13khz, exceeding the requirements.
If one is considering ceiling speakers for atmos, where a large number of seats off axis vertically are concerned, Klipsch just might be a good solution.
Anyone else know of any wide dispersion speakers that can meet Dolby’s specs?
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