Low-frequency sound diffusion requires impractically deep diffuser wells

Evidence

In order to do this, their maximum depth must be λ 2 at the lowest design frequency. This means that to achieve diffusion, a reasonable depth is required. For example, to have effective diffusion down to 500 Hz, a depth of 34 cm (13.5 inches) is required. To get down to 250 Hz, one would need to double this depth. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2096

Categorization

• XREF: Connects to room acoustics treatment design — practical tradeoffs between bass absorption and diffusion that studios and listening rooms face. — connects to: Effective low-frequency diffusion requires physically deep wells, about 34 cm for 500 Hz — David Howard, Jamie Angus, coustics and Psychoacoustics, 2143