Humans detect level changes of about 1 dB at moderate volumes

Evidence

As discussed above, loudness depends on many acoustic parameters of a sound event, such as level, spectral content, and duration. It is also interesting to quantify the JND of loudness to see how small a change is detected at all. This has been researched as the JND of level, which has a very strong influence on loudness. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1162

Categorization

• XREF: connects to: Identification might operate at a different level than researchers measured. — John Drury and Rupert Brown and Roberto González and Daniel Miranda, Emergent social identity and observing…, 120