| Phons (Loudness Level) | Sones (Perceived Loudness) | Perceived Change | |------------------------|----------------------------|------------------| | 40 | 1.0 | Reference | | 50 | 2.0 | Twice as loud | | 60 | 4.0 | Four times as loud | | 30 | 0.5 | Half as loud |
Proposed by Stanley Smith Stevens in 1936, the sone was created to bridge the gap between measurable sound energy and human sensation. sone definition
The is a unit of loudness , a psychoacoustic measure of how loud a sound is perceived by the human ear. Unlike physical measures of sound pressure (decibels), the sone scale is linear and directly proportional to perceived loudness. A sound rated as 2 sones is perceived as twice as loud as a sound rated as 1 sone. | Phons (Loudness Level) | Sones (Perceived Loudness)
