In this video, Acoustics First Explains Sound Diffusion

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This video provides a great visual illustration of sound diffusion – the scattering of sound energy.

Sound diffusion in simple terms is the scattering of sound energy.

Using an array of ping pong balls to represent sound visually, this video simply demonstrates what occurs when sound strikes an acoustic diffuser’s surface.

http://www.acousticsfirst.com/educational-videos-acoustic-sound-diffusion.htm