If you’ve ever wondered what is a limiter, the short answer is this: a limiter is a processor that stops your audio from ever going above a level you set. It catches the loudest peaks and holds them at a ceiling, so nothing breaks through and clips. Think of it as a very strict, very fast compressor with one job — never let the signal exceed this line.
Limiters are most associated with mastering and with making tracks loud, but they have practical uses throughout a mix. This guide explains how a limiter works, how it differs from a compressor, and where to use one without wrecking your sound.
How a limiter works
A limiter sets a maximum output level — the ceiling — and applies enough gain reduction to keep peaks from crossing it. Where a typical compressor might gently lean on signals above a threshold with a moderate ratio, a limiter uses an extremely high ratio (effectively infinity to one) and a very fast attack. The result is a hard wall: signal goes in, but it never comes out louder than the ceiling.
Most modern limiters are “brickwall” limiters, meaning they guarantee no peak ever exceeds the ceiling. Many are also “look-ahead,” analysing the audio a fraction of a second early so they can clamp transients cleanly without distortion.
It helps to picture the two numbers a limiter juggles. The threshold (or input gain) decides how much signal is pushed up against the wall, and the ceiling decides where that wall sits. As you lower the threshold, more of the signal hits the limiter and more gain reduction is applied, which raises the perceived loudness. The ceiling, meanwhile, never moves — that’s the whole point. Everything that would have poked above it is held back, and the gain reduction meter shows you how much work the limiter is doing on each peak.
Limiter vs compressor
A compressor shapes dynamics — it can be subtle, musical, and used to glue a mix or even out a vocal. A limiter is about control and loudness — it prevents overshoots and raises perceived volume. In practice a compressor reduces the gap between loud and quiet across the whole signal, while a limiter mostly affects the very top. If you’re new to dynamics processing, start with our EQ and compression fundamentals and our guide on how to use a compressor.
A useful way to think about it: a compressor is for tone and feel, a limiter is for safety and loudness. You reach for a compressor when you want a sound to behave a certain way musically, and you reach for a limiter when you simply cannot allow the level to go any higher. Many engineers use both in sequence — gentle compression to shape the dynamics, then a limiter at the end as a final ceiling.
The main limiter controls
- Ceiling (output): the absolute maximum output level. For digital masters, set it just under 0 dBFS — typically -0.3 to -1.0 dBTP — to leave headroom for lossy encoding.
- Threshold / input gain: how hard you push the signal into the limiter. Lower the threshold (or raise input) for more limiting and more loudness.
- Release: how quickly gain returns after a peak. Fast release means more loudness but more risk of distortion; slow release is cleaner but can sound pumped.
- Look-ahead: lets the limiter see peaks coming and catch them transparently.
How to set up a limiter on a master
Once you understand the controls, a reliable starting routine keeps you out of trouble. Work in this order rather than diving straight for maximum loudness:
- Set the ceiling first. Choose a true-peak ceiling — around -1.0 dBTP is a safe default — before you touch anything else, so the limiter can never let a peak escape past it. If you’re unsure why true-peak matters, our explainer on what true peak is covers it.
- Lower the threshold gradually. Pull the threshold down (or push the input up) a little at a time, watching the gain reduction meter. A few decibels of reduction on the loudest moments is usually plenty.
- Listen, don’t just look. Bypass the limiter and match the levels by ear so the louder version isn’t fooling you. If the limited version sounds flat, lifeless or distorted, you’ve gone too far.
- Check the release. If the mix pumps or breathes unnaturally, slow the release down. If it sounds dull or loses energy, speed it up slightly. Many limiters offer an automatic release that adapts to the material.
- Reference against a target. Aim for a sensible loudness for where the track will live rather than the loudest possible number.
Where to use a limiter
The classic place is the very last slot on your master bus, after everything else, to control final peaks and set loudness. It’s the tool that gets you to a sensible target level — read our LUFS guide to understand how loud your master should actually be, and what mastering involves overall.
Limiters also work on individual tracks: taming an unruly bass peak, catching the odd vocal spike that a compressor missed, or controlling a slap on a drum bus. Just remember that pushing a limiter hard reduces the track’s dynamic range, so use it with restraint. For more techniques, see the mixing and mastering hub.
Common limiter mistakes
- Pushing for maximum loudness: hammering the limiter flattens the life out of a mix and adds distortion. Aim for the loudness your platform wants, not the loudest possible.
- No true-peak headroom: a 0 dBFS ceiling can still clip after MP3 or streaming encoding. Leave a little headroom with a true-peak ceiling.
- Using a limiter to fix a weak mix: if the balance is wrong, a limiter only makes the problems louder. Sort the mix first.
- Stacking limiters everywhere: a limiter on every channel plus another on the bus piles up tiny distortions that add up to a brittle, fatiguing master. Limit deliberately, not by reflex.
Frequently asked questions
Is a limiter just a compressor with a high ratio?
Essentially, yes — a limiter is a compressor with a very high ratio and fast attack, designed to stop peaks dead. But dedicated limiters add features like brickwall ceilings, look-ahead and true-peak detection that ordinary compressors don’t have, which is why they’re a separate tool.
Do I need a limiter on every track?
No. Most tracks don’t need one. Use a limiter where you genuinely need to cap peaks, and reserve the main one for your master bus. Over-limiting individual channels just stacks up distortion and squashes the mix.
What ceiling should I set for a master?
For streaming and downloads, a true-peak ceiling around -1.0 dBTP is a safe, common choice. It leaves headroom so the file doesn’t clip after the lossy encoding that platforms apply.
What’s the difference between dBFS and dBTP?
dBFS measures the level of the digital samples themselves, while dBTP (decibels true peak) estimates the actual peak of the reconstructed analogue waveform between samples, which can sit slightly higher. Because lossy encoders can nudge those inter-sample peaks above 0, setting your ceiling in dBTP is the safer way to guarantee no clipping after conversion.
Why does my master sound worse after limiting?
Almost always because it’s being pushed too hard. Excessive limiting squashes transients, kills the sense of dynamics and introduces distortion, so the track can feel smaller and more tiring even though it’s louder. Back off the input, leave more gain reduction headroom, and compare at matched loudness to hear the real difference.
