Even quarter-wavelength diffuser depths are too large for low frequencies

Related

• Diffusion depth scales proportionally with wavelength, so lower frequencies demand deeper surfaces (similarity 0.89)
• Effective sound diffusers ideally need no physical depth at all. (similarity 0.82)
• Diffuser depth sets a lower frequency below which no scattering occurs. (similarity 0.81)
• Bass wavelengths are long enough to avoid cabinet diffraction but midrange wavelengths are not. (similarity 0.80)
• Each open-end reflection filters out high frequencies until the fundamental remains (similarity 0.79)
• Frequency, wavelength, and velocity determine one another (similarity 0.78)