# equal-loudness contour

> frequency characteristics of hearing and perceived volume

**Wikidata**: [Q1498677](https://www.wikidata.org/wiki/Q1498677)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Equal-loudness_contour)  
**Source**: https://4ort.xyz/entity/equal-loudness-contour


## References

1. Freebase Data Dumps. 2013