Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Sound - Room Attenuation in Direct Sound Fields

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

Sponsored Links

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

Sponsored Links

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

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about


This page can be cited as

  • The Engineering ToolBox (2007). Sound - Room Attenuation in Direct Sound Fields. [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.


3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter


Sponsored Links