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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:

room attentuation as a function of room size and 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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  • Engineering ToolBox, (2007). Sound - Room Attenuation in Direct Sound Fields. [online] Available at: [Accessed Day Mo. Year].

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