Sound level has only a weak effect on perceived sharpness

Evidence

The unit of sharpness, the acum, is defined such that narrowband noise of width 1 Bark and centre frequency 1 kHz at an SPL of 60 dB produces a sharpness value of 1 acum. Psychoacoustic testing reveals that the level of sound also affects the perceived sharpness, but not very prominently. Increasing the level from 30 dB to 90 dB only doubles the sharpness value (Fastl and Zwicker, 2007, Chapter 9). — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1210

Categorization

• corroborated: 2 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1210
• XREF: connects to: Sharpness depends primarily on spectral content, not on level or bandwidth.; Sharpness depends on the spectral envelope, not fine structure; Sensory pleasantness decreases as sound sharpness increases — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1364 (+1 more)