A sound diffuser is a device that sends audio-waves in different directions, thereby reducing standing waves and echoes, and contributes to an improved listening environment. They should not be confused with a sound absorber, which absorbs the audio-waves. The more expensive diffusers send audio waves in different directions based on frequency.

Further reading

• Everest, F. Alton. The Master Handbook of Acoustics, McGraw-Hill, 2000 (ISBN 0-07-136097-2).