The optimum reverberation time for an auditorium or room of course depends upon its intended use. Around 2 seconds is desirable for a medium-sized, general purpose auditorium that is to be used for both speech and music. A classroom should be much shorter, less than a second. And a recording studio should minimize reverberation time in most cases for clarity of recording.
The reverberation time is strongly influenced by the absorption coefficients of the surfaces as suggested in the illustration, but it also depends upon the volume of the room as shown in the Sabine formula. You won't get a long reverberation time with a small room.
- Vienna, Musikvereinsaal : 2.05 seconds
- Boston, Symphony Hall: 1.8 seconds
- New York, Carnegie Hall: 1.7 seconds
Reverberation time
RT = 0.049 · V / A (V and A in feet)
Reverberation time
RT = 0.161 · V / A (V and A in meter)
RT60 = reverberation time in s (reverb time)
V = room volume in m3
A = α · S = equivalent absorption surface or area in m2
α = absorption coefficient
The terms "attenuation coefficient" and "absorption coefficient" are used interchangeably
S = absorbing surface area in m2
A = α1 · S1 + α2 · S2 + α3 · S3 + ..
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