Loudness category uncertainty peaks in the very soft to medium range

Evidence

The most uncertainty (shallow slopes) is observed across the 5–25 CU categories. The most across-listener variability in category width is observed for 5 CU, which spans in width from a maximum of 50 dB to a minimum of 3 dB. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2548