# Reverberation Time

## Sound Reverberation Time indicates the time it takes until the sound pressure level in a room is decreased with 60 dB

Reverberant sound is the collection of all reflected sounds.

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 and can be calculated as

Ta = 0.16 V / A                     (1)

where

Ta = reverberation time (s)

V = room volume (m3)

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

Ta = 0.16 V / [(A / αm) ln (1 / (1 - αm))]                       (2)

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

### Recommended Sound Reverberation Times for some typical Rooms

Recommended Reverberation Time - Ta - (s)
Room Volume
(m3)
Conference room, school, cinemaConcert Hall, Normal MusicChurch, Organ Music
10000 1.0 1.5 2.0
1000 0.8 1.3 1.6
100 0.6 1.1 1.2

#### Example - Sound Reverberation Time for a Room

The sound reverberation time for a room with mean sound absorption coefficient 0.2, total sound total sound absorption 12.2 m2 Sabine and room volume 4 m3 - can be calculated with equation (1) as

Ta = 0.16 (4 m3) / (12.2 m2 Sabine)

= 0.05 s

## Related Topics

• Acoustics - Room acoustics and acoustic properties - decibel A, B and C - Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation

## Tag Search

• en: sound reverberation time
• es: tiempo de reverberación de sonido
• de: Sound Nachhallzeit

## Search the Engineering ToolBox

- "the most efficient way to navigate!"

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!