Quadratic Residue Diffuser (QRD), 11-Well, Positive and Negative Versions

thingiverse

These are sound diffusers crafted after photographs of related items at Skywalker Sound Studios, and I meticulously calculated the measurements in a program called QRDude (Version: 3.0), found at https://www.subwoofer-builder.com/qrdude.htm before manually assembling them in Tinkercad. I lost several designs due to their complexity, but ultimately perfected these two and had them printed and tested. With some of these sound diffusers and my sound absorbers (https://www.thingiverse.com/thing:3665832), I've experienced a significant improvement in sound quality in my home office. Specifically, music and speech remain clear while walking around the room, whereas before they were only clear when seated. Additionally, annoying sound artifacts from combing and resonances have been significantly reduced. According to QRDude's design specs, frequencies above 781Hz should scatter, frequencies above 1563Hz should be diffused, with diminished benefits above 7634Hz and below 781Hz. I firmly believe they still provide noticeable improvements outside their calculated range. The minimum distance from the listener must be at least 26 inches for the desired effect to occur.