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Conversion of Phons to Sones
phons sones Dynamic Range
120 256  
110 128  
100 64 fff
90 32 fff
80 16 fff
70 8  
60 4 p
50 2 pp
40 1 ppp
32 0.5  
25 0.25  
19 0.125  
14 0.0625  
11 0.03125  
9 0.015625  
The phon and sone are units of perceived loudness. The phon is proportional to signal 
intensity in dB, while the sone is linear with perceived sound. Therefore, the two scales are 
not proportional. According to the definition by Stanley Smith Stevens who proposed the 
phon as a unit of loudness in 1936, 1 sone is equivalent to the loudness of a signal at 
40 phons, which is equivalent to the loudness of a 1 kHz tone at 40 dB SPL. 



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