Alesis Air Compressor Alesis Air Compressor User Manual

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Frequency-Dependent Limiting Application: De-Essing
Some vocalists and announcers, especially if equalized for more treble,
will produce excessive "sibilance" ("S" sounds, concentrated mostly in
the upper midrange and treble). In this situation, the limiter would
ideally limit the signal only when high frequency "S" sounds occur.
This is possible by inserting an equalizer into the side chain jack.
This application requires the special stereo-to-dual-mono cord men-
tioned above and an equalizer, such as the Alesis MEQ 230.
1. Plug the cord's stereo plug into the 3630's side chain jack.
2. Plug the stereo cord's ring plug into the EQ's input.
3. Plug the stereo cord's tip plug into the EQ's output.
4. Increase the EQ gain in those bands whose frequencies should trigger
limiting of the signal. For de-essing applications, try equalizer
frequencies in the range of 2 kHz to 10 kHz. Setup for de-essing is
quite easy. With a graphic equalizer, select a frequency (2K for
example), and set up an excessive boost (as much as 12dB). If the
chosen frequency is correct, the excessive gain at that frequency will
trigger the compressor when overly sibilant passages occur. If you are
successful, try adjacent frequencies one at a time to see which
frequency gives the best results. With a parametric EQ, create an
excessive boost in the 2kHz - 10kHz band, and sweep the frequency
control until best results are obtained. Thus, the high frequency "S"
sounds trigger program limiting more readily than the non-"S"
sounds.
5. Adjust the Threshold, Ratio, Attack, Release, etc. for the desired de-
gree of high-frequency limiting. In de-essing applications, it is your
goal to set the attack and release times as fast as possible, so that the
sibilant peaks are eliminated without any audible change in the
program material.
EQ inserted into
3630's sidechain
Vocal
To tape
Frequency Dependent Limiting (Stereo De-essing).
The EQ inserted into the 3630's sidechain insert
allows excessive sibilance to be limited without
affecting the rest of the program content
To tape
Mono or
Stereo plug
Vocal
12

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