Phase-based directional hearing works only below about 743 hertz

Evidence

Thus for sounds at 90°, the maximum frequency that can have its direction determined by phase is 743 Hz. However, the ambiguous frequency limit would be higher at smaller angles. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 723

Categorization

• SHARE: Good specific number for anyone interested in how audio engineers encode spatial cues via interaural time differences.
• XREF: connects to: Directional hearing resolution is worst near 1.7 kHz where head size equals one wavelength; The auditory system lacks robust access to interaural phase above 1000 Hz — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1520; The ear resolves low-frequency direction by measuring phase shift — David Howard, Jamie Angus, coustics and Psychoacoustics, 712

Broader Connections

• The auditory system lacks robust access to interaural phase above 1000 Hz #corroborates (0.85) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1520
• Directional hearing resolution is worst near 1.7 kHz where head size equals one wavelength #qualifies (0.82)
• The ear resolves low-frequency direction by measuring phase shift #qualifies (0.78) — David Howard, Jamie Angus, coustics and Psychoacoustics, 712