True Peak vs RMS: What's Actually Clipping Your Master
18 August 2026 · 5 min read
Your DAW's peak meter said you were fine. Then you bounced to MP3, uploaded to SoundCloud, and it sounds distorted. This happens constantly, and it's not a bug, your sample peak meter and true peak are measuring two different things, and only one of them predicts what happens after encoding.
What sample peak actually shows you
A standard peak meter reads the level of each individual digital sample. If no sample crosses 0 dBFS, the meter reads clean. But digital audio is a series of discrete points, and your playback system reconstructs a continuous waveform between them. That reconstructed waveform can peak higher than any individual sample did, sometimes by 1-3 dB. Your meter never sees this, because it can only measure the dots, not the curve between them.
Why true peak catches what sample peak misses
True peak (dBTP) estimates that reconstructed waveform using oversampling, so it catches inter-sample peaks before they become a problem. This matters most right before lossy encoding, MP3, AAC, and Opus all reconstruct the waveform during decoding, so an inter-sample peak your DAW never flagged can clip audibly the moment someone streams your track on a phone. Most streaming platforms mandate a true peak ceiling of around -1 dBTP for exactly this reason.
Where RMS fits in
RMS (root mean square) measures average signal level over a window of time. It's a rough proxy for perceived loudness and was the standard reference before LUFS existed, but it doesn't account for human hearing sensitivity across frequencies the way LUFS does. Two mixes can share identical RMS values and sound completely different in loudness if one has more energy concentrated where your ears are most sensitive. RMS is still useful for spotting dynamic range and gain-staging issues within a session, but it shouldn't be your final loudness reference, LUFS should.
How the three metrics actually work together
Sample peak: tells you if any single digital sample clips. Necessary but not sufficient.
True peak: tells you if the reconstructed analogue waveform will clip on playback or after lossy encoding. This is the number that predicts real-world distortion.
RMS: a rough loudness gauge, useful for gain staging inside a session, but not accurate enough for hitting a platform's loudness target.
Integrated LUFS: the actual perceptual loudness measurement platforms normalize against. This is what should drive your final master level.
The fix
Leave true peak headroom of at least -1 dBTP on any master headed for streaming, and don't rely on your DAW's stock peak meter to confirm it, most stock meters only show sample peak unless you specifically enable true peak metering or use a dedicated loudness plugin. If you're limiting hard to chase perceived loudness, check true peak after the limiter, not before, since limiters are often the exact stage that introduces inter-sample peaks.
Run your master through BetterMix to get true peak, integrated LUFS, and stereo width in one report, so you catch inter-sample clipping before your listeners do.