If you have ever uploaded a track and thought, “Why does this sound quieter on Spotify than it did in my DAW?”, you are not imagining it.
Streaming services can change playback level
One of the biggest reasons is loudness normalization. Spotify says it uses loudness normalization to balance softer and louder songs and currently adjusts tracks toward -14 dB LUFS under its normal setting.
That does not mean your uploaded master is permanently changed. Spotify says the adjustment happens during playback.
So why can a very loud master become quieter?
Imagine you master a song extremely loud. If the service is trying to make different songs feel more consistent, it can apply negative gain to your track during playback.
This is why simply making a master louder does not guarantee that listeners will hear it louder after normalization.
Why can two songs at a similar LUFS still feel different?
LUFS is useful, but it is not the whole story. Dynamics, frequency balance, true peak and the way the mix distributes energy all affect perceived loudness.
Spotify itself notes that a very dynamic track and a heavily limited loud track can behave differently even when normalization is applied.
What about Apple Music?
Apple Music has a feature called Sound Check that adjusts loudness between songs. Apple specifically notes that some songs are created louder than others and that Sound Check is intended to make them play at a more consistent volume.
What should you do?
- Do not chase a LUFS number blindly.
- Check integrated loudness and true peak before release.
- Listen to your master at matched playback levels against good reference tracks.
- Make sure your master still sounds clean after lossy encoding.
- Use loudness measurements as information, not as a replacement for listening.
The goal is not simply “make it loud”. The goal is to make it sound good and translate properly.
Sources: Spotify Support — Loudness normalization; Apple Support — If music in Apple Music sounds quiet.