More diffraction occurs for longer-wavelength, lower-frequency sound

Evidence

A plane wave having long wavelength arrives from the top of the image and is interrupted by a reflecting wall (left). The geometric shadow is a vertical line heading straight down from the end of the wall. Waves penetrating beyond this line into the shadow region are by definition “diffracting.” More diffraction occurs for longer-wavelength (lower-frequency) sound; the diffracted power is proportional to the wavelength. — Eric J. Heller, Why You Hear What You Hear- An…, 180

Categorization

• XREF: This is why bass from a speaker wraps around corners and through doorways while treble doesn’t—common audio experience explained. — connects to: Long bass wavelengths diffract less because they exceed cabinet dimensions — David Howard, Jamie Angus, coustics and Psychoacoustics, 2212; Rectangular loudspeaker cabinets produce significant diffraction even with off-center drivers — David Howard, Jamie Angus, coustics and Psychoacoustics, 2213