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How to use a limiter
Gazillion Industries ·
The last plugin in the chain, the one that makes everything louder, and
therefore the one everybody reaches for first and leans on hardest. Most of what a limiter gets
blamed for is work it should never have been asked to do.
A limiter stops a signal exceeding a ceiling you set. Use it last, set the ceiling at
−1 dBTP for anything that will be streamed or encoded, and push into it until you have the
loudness you want, watching the gain reduction meter: one to three decibels on peaks is normal
and healthy. If you need much more than that, the problem is upstream and no limiter setting will
fix it.
The short version
- Job
- prevent anything crossing a ceiling
- Position
- last, after everything else
- Ceiling
- −1 dBTP for streaming and encoded delivery
- Amount
- 1–3 dB of gain reduction on peaks
- Release
- fast enough to recover, slow enough not to distort
- Warning sign
- the meter never returning to zero
What it actually is
A limiter is a compressor with a very high ratio and a very fast attack, aimed at a ceiling
rather than at a musical result. A brickwall limiter behaves as if the ratio were infinite:
nothing gets past, ever. See limiter vs
compressor for where the line sits between them.
Most modern limiters use lookahead: they delay the audio by a few milliseconds so the detector
can see a peak coming and start reducing gain before it arrives, rather than clamping down after
it has already gone past. That is why a limiter can catch a transient that a compressor with the
same attack time would miss, and it is why limiters report latency.
How to set one
- Put it last. Anything after it can push the signal back over the ceiling you just set.
- Set the ceiling first: −1 dBTP for encoded delivery, tighter only for files that
will be played as they are.
- Turn on true-peak detection if it has it.
- Raise the input or threshold slowly, a decibel at a time, and watch the gain reduction
meter.
- Listen to the quiet bars, not the drops. Pumping shows up where there is space, not where
it is busy.
- Set release by ear: too fast and you hear distortion on bass notes, too slow and the
whole track ducks after every hit.
- Back off one decibel from wherever you stopped. You will not miss it tomorrow.
BEEFY has
LIMIT as one of two output choices, with SOFT CLIP as the other. They are separate switches and
either can be off.
Do the work before the limiter
This is the whole article in one idea. A limiter asked to deliver eight decibels of loudness
will pump, flatten and distort, because it is turning the entire mix down every time one snare
arrives. Deal with the peaks before it sees them and the limiter has almost nothing left to do.
The tools for that are clipping and saturation, both of which lower peaks without touching the
rest of the track. Clipper before limiter
covers the order and the amounts, and crest factor
explains why it works.
Where it costs you
Transients go first: the snare loses its crack, then the kick goes blunt. Then the sense of
depth, because everything gets pushed toward the same level. Then, at the extreme, audible
distortion on sustained low notes, where the limiter's release is moving fast enough to modulate
the waveform itself.
There is also a strategic cost. Streaming services normalize playback, so past a certain point
you are giving up dynamics for loudness that the listener's player is going to take straight back
off. How loud should my master be
has the numbers.
Questions people ask
What does a limiter actually do?
It prevents a signal exceeding a set ceiling, by reducing gain very quickly whenever the
signal would cross it. Used with make-up gain, that lets the whole track sit louder under the
same ceiling.
How much gain reduction should a limiter do?
One to three decibels on the loudest peaks for most material. If the meter is showing six or
more on average, move that work upstream to a clipper, a compressor or the mix itself.
Should I use a limiter before mastering?
Take it off the mix bus before you bounce for mastering. Leave headroom instead. If you are
mastering it yourself, the limiter belongs at the end of the mastering chain, not on the mix you
are feeding into it.
When should I use a limiter on vocals?
As a safety catch after compression, taking a decibel or two off the few loudest words, not as
the main dynamics control. Compression shapes the performance; the limiter just stops the
occasional spike from running away.
What BEEFY does
BEEFY is our saturation and loudness effect. SOFT CLIP opens switched on and
brings rounded, fuzzy edges to the loudest parts, which is the upstream work that stops a limiter
from having to do everything. LIMIT is the other choice when you want output
peaks held in check instead, and both can be turned off so you can push it yourself.
BEEF brings weight and density, COOK the color and bite, and
JUICE the level going in. Input and output clip lights watch both ends.
Last in the chain, and the least it has to do, the better it sounds.
Keep reading
- Limiter vs compressor — Where the line sits between them, and which one goes last.
- Clipper before limiter — Why the clipper goes first, how to set both, and why the true-peak limiter stays last.
- True peak — Why a file can read zero and still clip, and what ceiling to use.
BEEFY — saturation and loudness plugin for Mac and Windows. There is
a 28-second demo with three without/with comparisons on the page.
Hear it — $19