[ \textSones = 2^\left(\frac\textPhons - 4010\right) ]
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. sone definition
This formula is an idealization. The exact sone value for a given dB SPL depends on frequency, as the human ear is not equally sensitive to all frequencies. [ \textSones = 2^\left(\frac\textPhons - 4010\right) ] The
The sone is a perceptually relevant unit that quantifies how loud a sound feels , rather than its physical energy. Its linear scaling makes it intuitive for comparing loudness differences, and it is essential in product design, architectural acoustics, and hearing research. This formula is an idealization
1. Executive Summary
| Sound Source | Approximate Sones | Approximate Phons / dB SPL | |--------------|------------------|----------------------------| | Quiet library, soft whisper | 1 sone | 40 dB | | Normal conversation (3-5 ft) | 2-4 sones | 50-60 dB | | Busy street traffic | 8-16 sones | 70-80 dB | | Loud music, vacuum cleaner | 32-64 sones | 90-100 dB |