Norris-Eyring reverberation formula

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Norris-Eyring reverberation formula [′när·əs ′ī·riŋ ri‚vər·bə′rā·shən ‚fȯr·myə·lə]

(acoustics)

The reverberation time of a chamber, in seconds, is equal to 0.05 times its volume, in cubic feet, divided by the product of its surface area, in square feet, and the negative of the natural logarithm of 1 minus the absorption coefficient averaged over the surface.

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