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Acoustics and Psychoacoustics, 5th Edition by Jamie Angus, David M. Howard

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Appendix 5: Deriving the Reverberation Time Equation for Different Frequencies and Surfaces

In real rooms, we must also allow for the presence of a variety of different materials, as well as accounting for their variation of absorption as a function of frequency. This is complicated by the fact that there will be different areas of material with different absorption coefficients, and these will have to be combined in a way that accurately reflects their relative contribution. For example, a large area of a material with a low value of absorption coefficient may well have more influence than a small area of material with more absorption. In the Sabine equation, this is easily done by multiplying the absorption coefficient of the material ...

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