Room Attenuation in Direct Sound Fields

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Room size, absorption characteristics and attenuation in direct sound fields

Room attenuation in direct sound fields as function of room size and room absorption characteristics are indicated in the diagram below:

room attentuation as a function of room size and absorption characteristics

1 ft² = 0.0929 m²

The diagram above is based on a listener within 5 ft from the terminal.

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

Related Topics

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

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Directivity Coefficient and Sound Attenuation The attenuation in a room depends on the receiver and source location.
Sound Absorption Coefficients for some common Materials Sound absorption coefficients for some common materials as plaster walls, brickwork, plywood panels etc.
Room Absorption Characteristics Mean absorption coefficients and reverberation times for some typical rooms.
Propagation of Sound Indoors Sound and noise in a room will reach the receiver as direct and reverberant 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

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