Streaming services do not all play every file at the level used during mastering. Many measure loudness and adjust playback to create a more consistent listening experience.
That does not mean every master should be made to one universal number. It means loudness is one part of a release decision, alongside dynamics, tonal balance, true peak, encoding and the way the music is meant to move.
A master should still work when the listener changes service, device or playback setting.
Contents
- Mastering level and playback level are not the same thing
- There is no single correct loudness for every record
- Louder can change more than volume
- True peak and encoding still matter
- Album relationships should survive normalisation
- One master should serve the release
- Listen level matched when comparing masters
- What to tell your mastering engineer
- Questions about loudness and streaming
Mastering level and playback level are not the same thing
Mastering level
Playback level
The mastering engineer creates and delivers the audio file. A streaming service may then turn that file up or down during playback according to its own normalisation system and the listener’s settings.
The service is not necessarily changing the master stored in the catalogue. It is changing the playback gain applied when the listener presses play.
This is why a louder master may not stay louder beside another track. If both are normalised, the one with more remaining dynamics may feel more open even when the average playback level is similar.
There is no single correct loudness for every record
A sparse acoustic song, dense rock track, electronic release and live album do not need the same internal movement.
The right level depends on the arrangement, genre expectations, source mix and intended impact. A fixed target can be a useful check, but it should not replace listening.
Platform guidance also changes, and playback behaviour can vary between apps, subscription settings, web players and third-party devices. Building the entire master around one published number can create a result that is less convincing everywhere else.
Louder can change more than volume
Increasing level usually involves reducing peaks or controlling dynamics. That can make a track feel denser and more immediate, but it can also reduce punch, flatten contrast or bring distortion forward.
The effect depends on the music. Some records are built around density. Others rely on the distance between quiet and loud sections.
The question is not whether loud is good or bad. It is how far the track can be pushed before the musical relationships stop improving.
True peak and encoding still matter
A digital file can create higher peaks when it is encoded into another format or reconstructed during playback. Leaving sensible margin reduces the risk of added distortion.
Streaming services publish their own recommendations, but those figures are not a universal mastering law. Rupert checks the release in context, including how the source responds to level and whether encoding exposes a problem.
Apple Digital Master preparation adds its own audition and source requirements for eligible recordings.
Album relationships should survive normalisation
Single
Album
An album is not a playlist of unrelated files. Track-to-track contrast can be part of the writing and production.
Where a service applies album-level playback adjustment, quieter tracks can retain their relationship to louder tracks. In other listening contexts, tracks may be adjusted individually.
The master should therefore make sense as an album and as an individual song. That takes judgement rather than forcing every track to the same meter reading.
One master should serve the release
Artists are sometimes encouraged to create a different master for every platform. In most cases, one well-prepared stereo master is the more practical starting point.
The release may also need a separate CD-quality version, Apple Digital Master version or physical manufacturing file, but those are delivery requirements rather than excuses to create a different musical balance for every app.
Discuss the actual release route before commissioning unnecessary versions.
Listen level matched when comparing masters
A louder file often wins an immediate comparison, even when the underlying balance is less convincing.
Turn the louder version down before deciding. Listen to the vocal relationship, low end, transients, quiet sections and whether the track remains comfortable over time.
A useful master should survive that comparison after the level advantage has been removed.
What to tell your mastering engineer
Explain the release context. Is the track a single, part of an album or intended to sit beside earlier material? Are there genre references that demonstrate density or dynamics rather than only tone?
Tell Rupert if you are worried that the mix is already heavily limited, if a previous master felt too flat or if the record needs to retain strong contrast.
Describe the result you want from the music rather than a target number.
Questions about loudness and streaming
Will streaming normalisation ruin a loud master?
Normalisation may turn the playback level down. It does not automatically repair distortion or restore dynamics removed during mastering, which is why the decisions made before delivery still matter.
Do I need a separate master for each streaming service?
Usually not. One well-prepared stereo master can serve the main release, with separate files created where a delivery programme or physical format genuinely requires them.
Master for the music and prepare for the delivery
Send the finished mix, explain the release context and let the level decision follow the record rather than one universal number.
What audio mastering does for a finished mix
A practical explanation of the mastering stage, what can change after the mix and which problems still belong in the session.
Mixing and mastering and how to know what your track needs
Understand the difference between working inside the multitrack session and working from the finished stereo mix.
Preparing a music release in Dolby Atmos
What source material, release planning and distributor conversations need to happen before an immersive project begins.