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Definition — Sones

Heating and cooling systems often use sone ratings to indicate the "hum" level of the unit. Lower sone ratings are highly desirable for units located near bedrooms or living areas. Calculating Sones from Phons

The definition of a sone is: $$1 \text sone = 40 \text phon$$ sones definition

| Sones | Perceived Loudness | Approximate dB (dBA) | Real-World Example | | :--- | :--- | :--- | :--- | | 0.5 | Very quiet | 18–22 dB | Rustling leaves, whisper | | 1.0 | Quiet | 28–33 dB | Quiet library, refrigerator hum | | 2.0 | Noticeable | 38–42 dB | Quiet office, light rainfall | | 3.0 | Moderate | 45–48 dB | Normal conversation (low end) | | 4.0 | Intrusive | 50–53 dB | Average dishwasher | | 6.0 | Loud | 58–62 dB | Normal conversation (high end) | | 8.0+ | Very loud | 65+ dB | Vacuum cleaner, busy traffic | Heating and cooling systems often use sone ratings

: Exceptionally quiet. You might barely notice it’s running. You might barely notice it’s running

The term was proposed by psychologist Stanley Smith Stevens in 1936 to create a scale where a sound that is twice as loud as another has a value that is twice as high. For example: : The baseline (a 1k Hz tone at 40 dB). 2 sones : A sound perceived as twice as loud as 1 sone. 4 sones : A sound perceived as four times as loud as 1 sone. Sones vs. Decibels: What’s the Difference? The primary difference lies in physics vs. perception .