What is a Limiter and How Is It Different From a Compressor?

A limiter is a tool that prevents an audio signal from going above a set ceiling, no matter how loud the input gets. Visually and functionally, a limiter looks like a compressor — because it technically is a compressor, just pushed to an extreme setting. Understanding exactly where that line is drawn is key to using both tools correctly.

What Makes a Limiter Different From a Compressor?

A compressor uses a ratio you choose — 2:1, 4:1, 8:1 — to gently or aggressively reduce a signal once it crosses the threshold, but some of the loudness still gets through. A limiter is essentially a compressor with an extremely high ratio (often 20:1 or higher, sometimes described as "∞:1") and a near-instant attack time. The practical effect: nothing crosses the ceiling you've set — period. Where a compressor shapes and evens out dynamics, a limiter enforces a hard boundary that a signal is not allowed to cross.

The Key Parameters of a Limiter

Ceiling

The maximum output level the limiter allows through, usually set just below 0 dBFS (commonly around ‑1 dBTP for streaming-ready masters, to leave headroom for lossy encoding).

Input Gain / Threshold

How much you're pushing the signal into the limiter. Raising this drives more of the signal above the ceiling, causing more gain reduction — and if pushed too far, audible distortion or pumping.

Release

How quickly the limiter lets go after it's caught a peak. A release that's too fast can cause audible distortion on sustained loud passages; a release that's too slow can cause the overall track to sound squashed and lifeless.

Look-Ahead

Many modern limiters analyze audio slightly ahead of playback so they can react to an incoming peak before it happens, rather than after — resulting in cleaner, more transparent limiting with less distortion than older, reactive-only designs.

Where Each Tool Is Actually Used

Compressors are used throughout a mix — on vocals, bass, drums, and buses — to control dynamics in a musical, often audible way, shaping how a performance feels.

Limiters are almost always used at the very end of the signal chain: on the master bus during mixing (to catch unexpected peaks) and, most critically, during mastering, where a limiter is the final tool that brings a track up to a competitive, streaming-ready loudness while guaranteeing it never exceeds a safe peak level.

A Common Mistake: Over-Limiting

Because a limiter can make a track louder without technically distorting in an obvious way, it's tempting to push it hard to "compete" in loudness. But excessive limiting — driving a track far into gain reduction — crushes dynamics, introduces audible pumping and distortion, and makes a track fatiguing to listen to. As covered in our LUFS article, most streaming platforms normalize loudness anyway, so over-limiting only adds damage without gaining any real perceived loudness advantage.

Conclusion

A compressor shapes dynamics; a limiter enforces an absolute ceiling. They share the same underlying mechanism but serve very different roles — compressors work throughout a mix to control feel and consistency, while limiters do their most important work at the very end of mastering, protecting a track from ever exceeding a safe, competitive level.

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