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The Sone: A Psychophysical Scale for Perceived Loudness

While physical sound intensity is measured objectively in decibels (dB SPL), human perception of "loudness" is nonlinear and frequency-dependent. The son is the standard unit of perceived loudness . Unlike decibels, which measure pressure, the sone scale is linear with respect to subjective sensation: a sound rated as 2 sones is perceived as twice as loud as a sound rated as 1 sone. sones meaning