96 kHz.org
Advanced Audio Recording

Quadratic residue diffuser with variant frequency

In modern studios acoustic diffusers are used to control wall reflections and create a smoothed sound environment. QRDs are designed for one frequency which might be suspicious for some users. Therefore I though about a design which uses 2 frequencies. It's shape - in detail the angle of the elements - morphs in between two possible positions:

QRD - Princip

an acoustic diffuser with two different frequencies

Acoustic diffuser with two different element angles which change according to frequency definition

QRD - Architecture

The ready built diffuser design:

Acoustic diffusers with two different frequencies


Quadratic residue diffusers using 2 orientations to build a wall.


wall of acoustic diffusers with two different frequencies

Several Diffusors joined to get a complete wall


You are encouraged to use the designs for private use.


 See the former article about QRDs




2004 J.S.