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Spherical Rooms
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Posts: 2
October 14, 2023 - 9:48 am

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Dennis,

I primarily work in the area of medium and large room acoustics. I’m writing a lengthy commentary titled Acoustic Essentials for Architects. I’m currently dealing with room geometry, and am stuck on one particular shape – the interior of a sphere.

Somewhere in my past study I remember seeing or hearing that the inside of a sphere is the worst possible acoustical shape, primarily for these two reasons: The lack of modal density and variety, and the concentrated/focused energy that’s reflected off concave boundaries.

However, I can’t seem to find any reference books or other published materials that specifically addresses spherical rooms. Do you mind confirming or commenting on this topic?

Part of what’s driving my curiosity is the new MSG Sphere in Las Vegas.

Thank you – mf

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Posts: 629
October 14, 2023 - 11:52 am
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Spherical rooms focus middle and high frequency energy into the center of the room. We have dealt with this in churches with spherical ceilings. Reverberation times increase with this shape so you must add approximately 25 % more absorption to counteract the higher reverb times.

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October 14, 2023 - 1:29 pm

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Thank you Dennis.

Can you comment on modal behavior in spherical rooms?

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