# \#loudness

**URL:** https://scanalyst.fourmilab.ch/tag/loudness/4739.md

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## [What Makes a Sound Loud?](https://scanalyst.fourmilab.ch/t/what-makes-a-sound-loud/3701)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [5 September 2023 12:45 UTC](https://scanalyst.fourmilab.ch/t/what-makes-a-sound-loud/3701 "2023-09-05T12:45:15Z")

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It isn’t the decibels, it’s the LUFS (Loudness units relative to full scale). Perceived loudness depends upon the sound pressure level, frequency content, and duration of sound. Note that the shape of the…