Retrieving "Loudness Level" from the archives

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1. Psychoacoustics

   Linked via "loudness level"

   Loudness Perception and the Phon Scale
   Loudness is the subjective correlate of sound intensity. Unlike frequency, loudness is not perceived linearly with physical intensity. The Phon is the unit used to quantify perceived loudness level. By definition, $1,000 \text{ Hz}$ at $40 \text{ dB SPL}$ is assigned a loudness level of $40 \text{ phons}$. For other frequencies, the number of phons assigned to a stimulus is numerically equal to the SPL in d…