The concha, acting as a resonant cavity, enables front-behind localization

Evidence

Sound localization is helped mainly by the acoustic effect of the pinna and the concha. The concha acts as an acoustic resonant cavity. The combined acoustic effects of the pinna and concha are particularly useful for determining whether a sound source is in front or behind and, to a lesser extent, whether it is above or below. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 518

Categorization

• SEED: Material that would anchor a piece on how human sound localization works versus how microphones fail to capture spatial cues.