Guide
Peak vs LUFS normalization — why “−1 dB” files still sound different
Why an audio normalizer should measure LUFS, not peaks
Peak normalization matches the loudest moment; LUFS normalization matches how loud a file sounds — and only LUFS makes two files play at the same volume.
Two recordings can both peak at −1 dB while one sounds much louder, because one is mostly quiet speech and the other is dense and compressed. LUFS measures average perceived loudness over the whole file — the kind of measurement streaming and podcast platforms use to set playback levels. A tool sold as an “audio volume normalizer” can mean either kind; this audio normalizer uses loudness normalization.
| Peak normalization | LUFS normalization | |
|---|---|---|
| Matches | The loudest sample | Perceived loudness |
| Two files sound equally loud | Rarely | Yes |
| What platforms measure | No | Yes |
| Watch out for | Quiet speech stays quiet | Needs a true-peak limit |
Audio normalizer vs audio leveler
An audio normalizer moves the whole file up or down by one amount; an audio leveler rides the volume moment to moment, lifting quiet passages and pulling loud ones down.
So a soft-spoken guest stays quieter than a loud host: this tool applies one gain change plus a true-peak limiter, with no compression. Speaker leveling is coming to the Podcast Enhancer. For now, record guests on separate tracks, set each one’s loudness before you mix, and normalize the finished mix last, after cleanup.
Does Spotify volume normalization make this unnecessary?
No — platforms adjust playback volume themselves, but delivering near their target keeps you in control of how your audio sounds.
Spotify volume normalization plays tracks at about −14 LUFS by default, and YouTube turns louder uploads down to a similar level. They only move the whole file, though: a master pushed far too loud gets turned down with its dynamics already flattened. Listeners can also switch Spotify’s normalization off, and not every player normalizes. Normalize audio to the target yourself, and what you hear in your editor is close to what your audience hears.
What about mono podcast audio?
Some producers aim for −19 LUFS on mono files, while Apple’s published guideline is −16 LUFS either way.
The idea is that a mono voice played through two speakers can sound louder than a stereo file at the same level. The normalizer offers both, so export each and compare on earbuds.
