LUFS Explained: Why Your Spotify Mix Sounds Quiet (And How to Fix It)
Integrated loudness, short-term LUFS, true peak — these aren't just numbers on a meter. They decide how loud your release actually plays on every platform.…
· Mastering
You finish a track, it slams in your DAW, you upload it — and next to a commercial release in the same playlist it sounds small. Nine times out of ten the problem is not your mix. It is that you were judging loudness by peak level, and streaming platforms judge it by LUFS.
What LUFS actually measures
LUFS (Loudness Units relative to Full Scale) comes from the ITU-R BS.1770 standard. Instead of asking "how high is the highest sample?", it asks "how loud does this sound to a person?". It does that by filtering the signal to roughly match how our ears weight frequencies (less sensitive to deep lows, more sensitive to the upper mids), then averaging the energy over time.
There are three readings worth knowing:
- Integrated LUFS — the average loudness of the whole track, with quiet passages gated out so a long silent intro does not drag the number down. This is the number platforms normalize to.
- Short-term LUFS — loudness over a sliding 3-second window. It tells you how loud your drop or chorus is, which is what a listener actually remembers.
- True peak (dBTP) — the highest level the waveform reaches once it is converted back to analog, including the peaks that happen between samples. A file can read -0.1 dBFS on a sample meter and still go over 0 dBTP.
Why loud masters can play quieter
Most streaming services turn tracks down (and some turn them up) so everything plays at a similar integrated loudness. Spotify, for example, targets around -14 LUFS integrated by default. If your master is -8 LUFS, it simply gets turned down by about 6 dB.
Here is the catch: to get to -8 LUFS you usually had to limit hard, which flattens transients. After normalization both tracks play at the same average level, but the one that kept its transients has punch and the one that was crushed sounds flat. Louder-than-the-target does not buy you loudness on a normalized platform — it buys you less dynamics.
So what should you aim for?
There is no single right number, and anyone who gives you one for every genre is guessing. A useful way to think about it:
- Streaming-first, dynamic genres (acoustic, jazz, cinematic): somewhere around -14 to -12 LUFS integrated keeps things open and loses nothing to normalization.
- Pop, hip-hop, rock: -11 to -9 LUFS is common and still leaves room for transients if the mix is clean.
- Club music played on DJ systems (which are not loudness-normalized): -9 to -7 LUFS is typical, because it has to sit next to other loud club tracks.
- Whatever the target, keep true peak at or below -1 dBTP for lossy streaming. Encoding to AAC or Ogg can add peaks, and a -0.1 dBTP master can clip after encoding.
Fix it in the mix first
If you cannot reach your target without the limiter working constantly, the mix is telling you something. The usual suspects are an over-heavy low end (sub energy eats headroom you cannot hear on small speakers), harsh 2–5 kHz content that makes you turn the whole thing down, and uncontrolled transients on a single element such as a snare.
Treat those before mastering and you will find the same loudness costs far less limiting.
How Level Mastering handles loudness
Level Mastering is algorithmic digital signal processing, not AI. You choose a target LUFS, and optionally a genre preset or your own reference track. The engine measures your track with the BS.1770 method, shapes the tone toward the reference with EQ (a linear-phase FIR in full-quality mode), and uses a true-peak limiter so the ceiling holds for inter-sample peaks too — not just the sample values.
Because the peak-to-loudness relationship is arithmetic (true peak minus loudness), the most reliable lever you have is the target itself. If a master feels squashed, lower the target by a dB or two and compare. On plans that include it, the QA Lab shows integrated LUFS, true peak and dynamic range side by side, so you can judge with numbers and ears together.
The short version
- Judge loudness in LUFS, not peak meters.
- Platforms normalize, so extra loudness mostly costs you dynamics.
- Pick a target that fits where the track will be played.
- Keep true peak around -1 dBTP for streaming.
- If the limiter is working too hard, go back to the mix.
Level Audio runs in your browser and needs JavaScript enabled.
Contact: support@levelaudio.co