Art's Blog: Diffusion

Diffusion is the scattering and weakening of reflected sound. A properly diffused reflection produces a more natural sound, contributing to enhanced Ambience in a room.

If an incident sound wave possesses 90 dB of sound energy, a properly diffused reflection will typically possess 85-87 dB of sound energy. Additionally, the angle of reflection is no longer related to the angle of incidence, as the sound is scattered among a wider angle. By its very nature, Diffusion obscures the source location of a sound.

The frequencies affected by a diffuser are related to its size, geometry, material, design, and placement.

Typical diffusion devices include polycylindrical diffusers, quadratic residue diffusers, and reflection phase grating diffusers.

Art Noxon is a fully accredited Acoustical Engineer with Master of Science degrees in Mechanical Engineering/Acoustics and Physics. A Professional Engineer since 1982, he is licensed in Oregon to practice engineering in the public domain with the specialty area of acoustics. A prolific inventor, he developed and patented the iconic TubeTrap, the original corner-loaded bass trap/treble diffuser, 150 other acoustic devices, and counting. Lecturer, writer, and teacher of acoustics, he has presented 7 AES papers, numerous magazine articles, white papers and blogs. He is president of Acoustic Sciences Corporation, the company he founded in 1984.

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