REVERBPLAN · PROFESSIONAL BROWSER TOOL
Absorption is not one coefficient. It is six band ledgers.
Sum boundary and treatment areas with six octave-band absorption coefficients into Sabins, compare Sabine and Norris–Eyring RT60, and invert the equivalent absorption still needed for a target time.
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Sabine and Norris–Eyring comparison
Target RT60 inverse gap
Coefficients must come from lab data matching the installation. The equations assume a diffuse field; nonuniform treatment, coupled rooms, air loss, occupancy, shape, and low-frequency modes can shift results, so measure after installation.
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