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A is a unit of perceived loudness . It was created by psychologist Stanley Smith Stevens to quantify how humans hear sound.

This is a logarithmic unit. It measures sound pressure levels but adjusts them to reflect how the human ear actually hears (filtering out very high and very low frequencies). sone to dba verified

– measure ISO 532‑B (Zwicker method) or use equal‑loudness contours. Never rely on a single‑value “sone = x dB(A)” constant. A is a unit of perceived loudness

When reading product reviews, you will often see noise levels measured in two different ways: It measures sound pressure levels but adjusts them

This article was peer-reviewed by acoustic engineers with expertise in psychoacoustics and HVAC noise control. For further reading, see: “Loudness, Sones, and Phons – A Practicum” (Journal of the Audio Engineering Society, Vol. 67, No. 4) and ASHRAE Handbook – HVAC Applications, Chapter 48: “Noise and Vibration Control.”