Room Attenuation in Direct Sound Fields

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

• (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

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Related Topics

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

Related Documents

• Directivity Coefficient and Sound Attenuation - The attenuation in a room depends on the location of the source and the receiver, and the room constant
• 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 the time it takes until the sound pressure level in a room is decreased with 60 dB
• Room Absorption Characteristics - Mean absorption coefficients and reverberation times for some typical rooms.
• Sound Absorption Coefficients for some common Materials - Sound absorption coefficients for some common materials as plaster walls, brickwork, plywood panels etc...