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A sone is a legitimate unit of perceived loudness. Created by Stanley Smith Stevens in 1936, one sone is equivalent to the loudness of a 1 kHz tone at 40 dB SPL (the level of a quiet office or a refrigerator's hum). The scale is linear: a 2-sone sound is twice as loud as 1 sone, 4 sones is four times as loud, etc. Sones are commonly used in specifying fan noise (exhaust fans, HVAC systems) and psychoacoustic research.

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The keyword likely has extremely low search volume (<10 monthly searches) and may be either an erroneous input or a private/internal identifier (e.g., a forum username + post number, a mis-copied product code, or a content hash). A sone is a legitimate unit of perceived loudness

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One sone is arbitrarily defined as the loudness of a 1,000 tone at 40 decibels above the listener's hearing threshold.