Reverberation Time

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The Reverberation Time - T_a - 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 - T_a - can be calculated as:

Mean sound absorption coefficient α_m <= 0.35:

T_a = 0.16 V / A         (1)

where

T_a = reverberation time (s)

V = room volume (m³)

A = the sound absorption of the room (m² Sabine)

Mean sound absorption coefficient α_m > 0.35:

T_a = 0.16 V / [ (A / α_m) ln( 1/(1-α_m ) ) ]         (2)

Note! The sound absorption of the room - A - varies with the frequency, and so do the reverberation time - T_a.

Recommended Sound Reverberation Time for some typical Rooms

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