I suspect it’s something to do with sounds waves so have flaired as physics, but not sure?
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There are a lot of correct and wrong answers here. There is another factor that hasn’t been discussed. Sound waves propagate in 3 dimensions. Energy from the sound waves will decrease according to the inverse square law.
This image visually describes the concept
[https://en.wikipedia.org/wiki/Inverse-square_law#/media/File:Inverse_square_law.svg](https://en.wikipedia.org/wiki/Inverse-square_law#/media/File:Inverse_square_law.svg)
If the sum of all the voices came from a single speaker and you were standing next to the person, it would rupture your eardrums.
The voices are spread out over space taken up by 100 people and a theater is a wide open space. No matter where you are located, even if you are among the singers, the pressures of the sound waves that hit your ear are exponentially lower than the sum of the sources of the sound.
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