# dBFS

> Decibels relative to full scale: the unit for digital audio levels, and why −78 dBFS is inaudible in practice.

Updated 2026-10-06. Canonical page: https://lagless.app/glossary/dbfs/

> dBFS measures a digital signal's level relative to the loudest possible value (0 dBFS). −78 dBFS is about 1/8000 of full scale, far below normal listening levels, which is why Lagless's keep-alive noise is effectively inaudible.

Related: [Keep-alive](/glossary/keep-alive/)