Introduction
The decibel (dB) is a unit used to measure the level of sound.
In music production, it is used to describe:
- loudness
- signal level
- changes in volume
Rather than measuring sound in absolute terms, the decibel expresses relative differences between levels.
What the Decibel Measures
The decibel compares one value to another.
In audio, this usually means:
- how loud a signal is compared to a reference level
- how much a signal has increased or decreased
This makes it useful for describing changes in sound level rather than fixed values.
Decibels and Loudness
In practical terms:
- higher dB values = louder sound
- lower dB values = quieter sound
However, the scale is not linear.
A small numerical change in decibels can represent a significant change in perceived loudness.
Common Reference Points
In digital audio:
- 0 dBFS (decibels full scale) is the maximum level before distortion
- levels above 0 dBFS will clip
Typical working ranges:
- around -18 dBFS → common reference level for mixing
- around -6 dBFS → louder signals approaching the limit
The Logarithmic Scale
The decibel scale is logarithmic, not linear.
This means:
- a change of +6 dB roughly doubles the signal level
- a change of -6 dB roughly halves it
This reflects how human hearing perceives loudness.
Decibels in Music Production
You will encounter decibels when:
- adjusting track volume
- setting recording levels
- applying gain or attenuation
- using EQ and compression
Understanding dB helps you make controlled and consistent adjustments.
Gain and Level
In a DAW, gain controls are measured in decibels.
For example:
- increasing gain raises the signal level
- decreasing gain reduces it
Proper level management is essential to avoid distortion and maintain clarity.
Use the decibel explorer below to hear and see how level changes affect a signal.
In digital audio, 0 dB is the maximum available level before clipping. Negative dB values reduce the signal, often by much more than the numbers first suggest.
Why the Decibel Matters
Understanding decibels allows you to:
- avoid clipping and distortion
- balance levels in a mix
- work consistently across projects
- control dynamics more precisely
It is a fundamental concept in both recording and mixing.
Related Topics
- Frequency, Amplitude and Waveforms
- What is Sound?
- Gain Staging Explained (future)
- What is EQ?
- Sample Rate and Bit Depth Explained
- What is a DAW?
This article is part of the Music Production Reference Library, organised into volumes covering sound, theory, production, and release.
