Audio peaking happens when a sound signal exceeds the maximum level a system can handle, causing distortion. In digital audio, that maximum is 0 dBFS (decibels relative to full scale), and any signal that crosses it gets its waveform chopped flat, producing harsh, crackling artifacts known as clipping. Whether you’re recording a podcast, mixing music, or just trying to figure out why your audio sounds broken, peaking is almost always the culprit.
Why 0 dBFS Is the Hard Ceiling
Digital audio systems represent sound as a series of numerical samples. Each sample has a fixed number of bits to describe the signal’s loudness at that instant. Zero dBFS is the absolute loudest value those bits can represent. Every measurement below it is expressed as a negative number, so a signal sitting at -12 dBFS is 12 decibels below the maximum.
When a signal pushes past 0 dBFS, the system simply runs out of numbers. It has no way to encode a value louder than its ceiling, so the excess data gets thrown away. The result is a waveform with its tops and bottoms sliced off, which is why the distortion is called “clipping.” The closer your signal rides to 0 dBFS, the more completely each sample is filled with information, and the less room remains for any unexpected spike in volume.
What Clipping Sounds and Looks Like
Mild peaking can sound like a brief crackle or pop on loud syllables or drum hits. Severe peaking turns into a sustained, harsh buzzing that’s impossible to miss. The reason it sounds so unpleasant comes down to physics: as clipping gets worse, the rounded shape of the original sound wave flattens into something closer to a square wave. Square waves contain a cascade of extra frequencies (called odd harmonics) that weren’t in the original signal. Even half a decibel of clipping on a simple tone adds significant energy at three, five, and seven times the original frequency, cluttering the sound with unwanted brightness and grit.
Visually, peaking is easy to spot. In any audio editor or recording app, a clipped waveform shows flat horizontal lines where the peaks and valleys should be rounded. Most meters also turn red or display a warning indicator when levels hit 0 dBFS. If you see flat-topped waveforms or red meters, the audio has peaked.
Analog Peaking vs. Digital Peaking
Not all peaking sounds equally bad. Analog equipment, like tape machines and tube amplifiers, distorts in a gentler way. When an analog signal exceeds its headroom, the waveform rounds off gradually rather than getting sliced flat. The transition from clean to distorted is smooth, and the added harmonics include both even and odd multiples of the original frequency. This is the “warm” saturation that musicians and producers sometimes use as a creative effect.
Digital clipping offers no such grace. The output is a perfectly flat plateau with sharp vertical edges, producing distortion that sounds brittle and broken. There’s nothing musical about it. This is why preventing peaks matters far more in digital recording than it ever did on tape.
How to Prevent Peaking While Recording
The simplest way to avoid peaking is to record at a lower level than you think you need. In modern 24-bit recording, you have an enormous dynamic range to work with, so there’s no reason to push your levels high. A widely used target is to keep your loudest moments peaking around -18 dBFS. That leaves roughly 18 decibels of headroom, meaning even an unexpectedly loud sound is unlikely to clip.
This is a shift from the old days of 16-bit recording and analog tape, where engineers needed hot signals to stay well above the noise floor. With 24 bits, the noise floor is so low that recording conservatively costs you nothing in quality. Many digital plugins and virtual instruments are actually calibrated to work best at -18 dBFS, where their internal processing hits a “sweet spot” that mimics the behavior of the analog gear they’re modeled on.
Gain Staging Keeps Levels Safe
Gain staging is the practice of managing volume at every point in your signal chain so that no single stage overloads. In a typical mix, this means setting each individual track’s level to hover around -18 to -20 dBFS before any processing. When you start adding effects like compression, EQ, or reverb, each plugin can boost the signal slightly. Starting lower gives you a cushion so those boosts don’t push anything past 0 dBFS.
A practical approach: set a meter on your master output and adjust the input gain of every track so it plays at roughly -18 dBFS with the fader at its default position. Then, as you route groups of tracks together (all your drums to one bus, all your vocals to another), check those group outputs as well. A common target for submixes is around -14 dBFS. The goal is simple: make sure nothing hits 0 dBFS on the master bus at any point in the chain.
How Limiters Tame Peaks
A limiter is essentially an extreme compressor that catches the loudest moments of a signal and prevents them from exceeding a set ceiling. In mastering (the final stage before release), limiters act as a safety net. You set a ceiling, often -1 dBFS or lower, and the limiter applies instant, transparent compression to any peak that would cross that line.
True peak limiters go a step further. Standard peak meters measure individual digital samples, but the actual analog waveform reconstructed between those samples can sometimes exceed the measured value. A true peak limiter accounts for this, catching those “inter-sample peaks” that would otherwise cause distortion during playback or format conversion. For most final masters, a true peak ceiling of -1 dBTP (decibels true peak) is considered safe.
Streaming Platform Targets
If you’re preparing audio for Spotify, YouTube, Apple Music, or similar services, peaking matters in a specific way. These platforms apply loudness normalization, meaning they adjust your track’s volume to match a reference level. Spotify and YouTube both use -14 LUFS (a measurement of average perceived loudness) as their default target. If your master is louder than that, the platform turns it down.
This means pushing your audio to the absolute loudest level possible before clipping gains you nothing. The platform will just reduce it. A well-balanced master around -14 LUFS with true peaks no higher than -1 dBTP works safely across all major services. For lossless streaming formats, keeping true peaks below -0.3 dBTP provides an extra margin of safety during encoding.
Can You Fix Audio That Already Peaked?
Once audio has clipped, the original waveform data above 0 dBFS is gone. Simply turning down the volume of clipped audio doesn’t restore what was lost. It just makes the distortion quieter. The flat-topped waveforms remain flat-topped.
Declipping software attempts to reconstruct the missing peaks using mathematical algorithms that estimate what the original waveform probably looked like. These tools can reduce the audible harshness, especially for mild clipping, but they’re working from incomplete information. The results vary depending on how severely the audio peaked and what kind of sound was clipped. Dense, complex material like a full mix is harder to restore than a single voice or instrument. Declipping is a rescue tool, not a cure. Prevention through proper levels and gain staging is always the better option.