Compressor vs Limiter vs Clipper: Which One Controls Peaks?

What is the difference between a compressor, a limiter and a clipper?

All three reduce peaks, but at different speeds and with different side effects. A compressor rides gain up and down with attack and release times, a limiter does the same with an infinite ratio and a hard ceiling, and a clipper has no envelope at all: it changes the shape of the waveform itself.

That is why they sound different when pushed. Too much compression pumps and flattens groove, too much limiting smears transients and adds distortion on bass, and too much clipping sounds like fuzz. Used together, each doing a small job, they get a mix loud without any single stage being audible.

How do ratio and knee shape what a compressor does?

The ratio sets how much a signal above the threshold is reduced, and the knee sets how gradually that reduction starts. Ableton's manual gives the math: with a ratio of 3, a signal that rises 3 dB above the threshold comes out only 1 dB louder, and a ratio of 1 means no compression at all.^[1]

At a knee of 0 dB, nothing below the threshold is touched and full compression applies above it, a hard knee that the manual warns can sound harsh at very high ratios. Higher, soft knee values start compressing gradually as the threshold approaches.^[1]

Attack is what makes a compressor different from a limiter in practice. The same manual notes that a slight attack of 10-50 ms lets peaks come through unprocessed.^[1] That is deliberate: a compressor is usually there to control the body of a sound, not to catch every transient. For the fundamentals, see audio compression explained.

What makes a limiter a brickwall?

A limiter is a compressor with an infinite ratio: once the signal reaches the ceiling, it cannot get any louder. Ableton describes its Limiter exactly that way and adds that the Ceiling control sets the absolute maximum level the device will output.^[1]

To catch peaks cleanly, limiters look ahead. Ableton's Limiter offers 1.5, 3 or 6 ms of lookahead and warns that shorter lookahead allows more compression but can increase distortion, especially on bass. Its True Peak mode prevents inter-sample peaks.^[1]

Inter-sample peaks matter because a limiter that only watches sample values can still let the reconstructed analog waveform go over 0 dB. FabFilter notes that ultra-fast limiting or hard clipping in the digital domain can itself introduce inter-sample peaks, and that oversampling and a longer lookahead reduce them.^[2] The deeper version is in true peak limiting explained, and limiter basics are covered in what a limiter is.

How is a clipper different from a limiter?

A clipper does not turn the gain down; it removes or rounds whatever part of the waveform crosses the threshold, instantly. There is no attack or release, so there is no pumping, but everything above the threshold becomes distortion.

On very short peaks, such as the first millisecond of a snare or kick, that distortion is brief enough to be hard to hear, while the level you gain back is real. That is the whole trick behind clipping for loudness: shave the fastest transients with a clipper so the limiter after it has less to do.

The curve decides the color. Sound on Sound describes hard clipping as starting abruptly at a set level, while soft clipping becomes progressively more nonlinear above a certain point.^[3] Image-Line describes its Fruity Soft Clipper as a soft limiter that applies gentle, soft-knee compression and causes saturation effects above the threshold, warning that a little saturation brings warmth but too much sounds distorted.^[4]

• Hard clip Flat top at the threshold. Most transparent on 1-2 dB of very short peaks, harshest when pushed further.
• Soft clip Rounds the peak before the ceiling. Warmer, adds more low-order harmonics, can dull the attack slightly.
• Oversampling Runs the clipper at a higher internal sample rate to reduce aliasing. Turn it on for the master bus.
• Built into other tools Ableton's Limiter has a Soft Clip ceiling mode, and its Glue Compressor has a Soft clip switch that caps output at -0.5 dB but is not transparent.^[1]

If you want clipping as a sound rather than as peak control, the sibling guide to saturation vs distortion vs overdrive vs fuzz covers the tonal side.

Where does each one go in the chain?

The usual order is compressor first, clipper second, limiter last. Each stage handles a different time scale: the compressor shapes the body over tens of milliseconds, the clipper shaves the fastest transients, and the limiter catches whatever still reaches the ceiling.

808 example: which tool keeps the peaks in check?

On 808s, a clipper usually beats a compressor or limiter for peak control. The sub is a slow waveform, so fast gain changes from a compressor or limiter modulate it and create distortion anyway, while a clipper shaves only the attack and leaves the sustain alone.

1. Balance the 808 against the kick
   Set the level by ear first so you know how loud the peaks really need to be.
2. Insert a clipper
   Lower the threshold until the meter shows 1-3 dB of clipping on the note starts only.
3. Level-match and compare
   Match output to the bypassed level. The clipped 808 should feel just as heavy but take less headroom on the meter.
4. Add compression only for sustain
   If long notes decay unevenly, use a compressor with a slow attack of 30 ms or more and a release that follows the note length.
5. Check in mono and on small speakers
   Clipping adds harmonics; make sure they help the 808 read on a phone rather than fuzz the low end.

Master bus example: how to get loud without distortion

On the master bus, split the work between a gentle clipper and a true peak limiter, and stop before either becomes audible. Streaming services turn loud masters down anyway: Spotify normalizes tracks to -14 LUFS and recommends keeping true peak below -1 dB, or below -2 dB if the master is louder than -14 LUFS integrated.^[5]

1. Leave headroom from the mix
   Aim for mix-bus peaks around -6 to -3 dBFS before any master processing.
2. Clip first, gently
   Set an oversampled clipper to catch only the sharpest drum peaks, about 0.5-2 dB.
3. Limit last
   Use a limiter with true peak detection and a ceiling of -1 dBTP, or lower for very loud masters.
4. Push until it breaks, then back off
   Raise the limiter input until you hear distortion or lost punch, then back off by 1-2 dB.
5. Compare at matched loudness
   Turn the processed master down to the same loudness as the bypassed one. If it sounds worse at equal level, you went too far.