Reverberation Time
The Sound Reverberation Time indicates the time it takes until the sound pressure level in a room is decreased with 60 dB
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The Reverberation Time - Ta - for a room is the time it takes before the sound pressure level has decreased with 60 dB after the sound source is terminated.
The Reverberation Time - Ta - can be calculated as:
Mean sound absorption coefficient αm <= 0.35:
Ta = 0.16 V / A (1)
where
Ta = reverberation time (s)
V = room volume (m3)
A = the sound absorption of the room (m2 Sabine)
Mean sound absorption coefficient αm > 0.35:
Ta = 0.16 V / [ (A / αm) ln( 1/(1-αm ) ) ] (2)
Note! The sound absorption of the room - A - varies with the frequency, and so do the reverberation time - Ta.
Recommended Sound Reverberation Time for some typical Rooms
| Recommended Reverberation Time - Ta - (s) | |||
| Room Volume (m3) | Conference room, school, cinema | Concert Hall, Normal Music | Church, Organ Music |
| 10,000 | 1.0 | 1.5 | 2.0 |
| 1,000 | 0.8 | 1.3 | 1.6 |
| 100 | 0.6 | 1.1 | 1.2 |
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