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Sound - Room Absorption Characteristics

Mean absorption coefficients and reverberation times in typical rooms.

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The table below indicates mean sound absorption coefficient - α_m - and reverberation time - T_a - for some typical rooms.

Room Characteristics	Very Soft	Soft	Normal	Hard	Very Hard
Reverberation time - T_a-	0.2 < T_a < 0.25	0.4 < T_a < 0.5	0.9 < T_a < 1.1	1.8 < T_a < 2.2	2.5 < T_a < 4.5
Typical Room	Radio and TV studio	Restaurant Theater Lecture hall	Office Library Flat	Hospital Church	Large church Factory
Mean sound absorption coefficient - α_m-	0.40	0.25	0.15	0.10	0.05

The mean sound absorption coefficient should be calculated when more accurate values are needed.

The diagram below can be used to determine the sound absorption in rooms of different sizes and with different accoustic characteristics.

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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.
Noise and Attenuation - Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.

Related Documents

Propagation of Sound Indoors - the Room Constant - In a room the sound or noise will reach the receiver as direct and reverberant sound.
Sound - Reverberation Time - The sound reverberation time indicates how long it takes until the sound pressure level in a room is decreased with 60 dB.
Sound - Room Absorption Coefficients - Room sound absorption and absorption coefficients for common materials like plaster walls, brickwork, plywood panels and more.
Sound - Room Attenuation in Direct Sound Fields - Room size, absorption characteristics - and attenuation in direct sound fields.

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