Listeners typically cannot hear below 16-bit resolution in normal listening conditions

Bit depth determines the dynamic range and noise floor of a digital audio system. In practice, the limit on hearing quieter signals is set by environmental noise, equipment noise floors, and physiology (breathing, blood flow) — not the digital bit depth. A listening test using signals that drop by one-bit increments from 16-bit to 24-bit demonstrates that most listeners cannot distinguish 17-bit from 24-bit under realistic conditions. The argument for 24-bit in production is valid (more headroom during mixing, no accumulated quantization from processing), but 16-bit 44.1 kHz is a lossless consumer delivery format for this reason.

Examples

EarLevel ‘multi-level sweeps.wav’ test file: announces each sweep by effective bit depth. Equipment noise floors, room noise, and physiological limits typically mask the signal long before reaching 20-bit depth.

Assessment

A producer argues they need 24-bit for streaming delivery because 16-bit ‘sounds worse.’ Evaluate this claim using the concepts of noise floor, dynamic range, and listening conditions.