Effects Reference

Chapter 3 Dynamics 49
Limiter
The Limiter functions similarly to a compressor with one important difference: where a
compressor proportionally reduces the signal when it exceeds the threshold, a limiter
reduces any peak above the threshold to the threshold level, effectively limiting the
signal to this level. The Limiter is used primarily as a mastering effect.
Limiter Parameters
 Gain reduction meter: Shows the amount of limiting while the signal plays.
 Gain slider and field: Sets the amount of gain applied to the input signal.
 Lookahead slider and field: Adjusts how far ahead (in milliseconds) the Limiter
analyzes the audio signal.
 Release slider and field: Sets the amount of time after the signal falls below the
threshold before the Limiter stops limiting.
 Output Level knob and field: Sets the output level of the signal.
 Softknee button: When selected, the signal is limited only when it reaches the threshold.
When switched on, the transition to full limiting is nonlinear, producing a softer, less
abrupt effect, and reducing distortion artifacts that can be produced by hard limiting.
The Lookahead parameter allows the Limiter to look forward in the audio so that it can
react earlier to peak volumes by adjusting the amount of reduction. Using Lookahead
causes latency, but this latency has no perceptible effect when you use the Limiter as a
mastering effect, on previously recorded material. Set Lookahead to higher values if
you want the limiting effect to take place before the maximum level is reached,
creating a smoother transition.
Typically, you apply the Limiter as the very last effect in the mastering signal chain. In
this case, you use the Limiter to raise the overall volume of the signal, so that it reaches
but does not exceed 0 dB.
The Limiter is designed in such a way that if set to 0 dB Gain and 0 dB Output Level, it
has no effect (on a normalized signal). If the signal clips (red gain line), the Limiter—
using its basic settings—reduces the level before clipping can occur. (However, the
Limiter cannot fix audio that was clipped during recording).