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Sound - Room Attenuation in Direct Sound Fields

Room size, absorption characteristics - and attenuation in direct sound fields.

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Room attenuation in a direct sound field as function of room size and room sound absorption characteristics:

1 ft² = 0.0929 m²

The diagram is based on a listener within 5 ft (1.5 m) from the source.

Typical Rooms and their Absorption Characteristics

Hard - bath rooms, large churches, gymnasiums, factories
Average - private homes, concert halls, restaurants, offices, conference rooms, hotel rooms, school rooms, hospitals, libraries, churches, reception rooms
Soft - radio and TV studios, theaters

Example - Sound Attenuation in an "Average" Room

The sound attenuation in an "average" room with surface 100 m² (1076 ft²) can be estimated from the diagram above to be approximately

5 dB

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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.

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 - Attenuation and Speed vs. Sound Frequency and Air Humidity - The speed and attenuation of sound in moist air varies with sound frequency and air humidity.
Sound - Attenuation and the Directivity Coefficient - The attenuation in a room depends on the location of the sound source and the receiver - and the room constant.
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 Characteristics - Mean absorption coefficients and reverberation times in typical rooms.
Sound - Room Absorption Coefficients - Room sound absorption and absorption coefficients for common materials like plaster walls, brickwork, plywood panels and more.
Sound Pressure - Sound Pressure is the force of sound on a surface perpendicular to the propagation of sound.

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