Applications - Alesis 3632 Compressor Guide D'utilisation Rapide

Rear Panel
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23. Voltage selector- Set this to the correct voltage for your location standard
24. AC input- Connect the included IEC power cable here
25. Audio in- Balanced ¼" TRS phone jack and XLR input connectors
26. Audio out- Balanced ¼" TRS phone jack and XLR output connectors
27. Operating level control- Sets the operating level to either -10dBV or the +4dBu
28. Sidechain send- 1/4" unbalanced jack to route audio to an external processor
29. Sidechain return- 1/4" jack processes the return signal sent from an external processor

APPLICATIONS

The 3632 can be used in a variety of situations including:
Compressor- If an audio signal exceeds the set threshold; the audio signal will be reduced in gain in
proportion with the amount above the set threshold.
Ducking- Ducking allows background music to automatically be turned down whenever an external source,
such as an announcer's voice, begins to speak. To use the compressor as a ducker, plug the announcer's
mic into a mixer and feed that mic to the compressor's Sidechain in. Plug the music source into the 3632
inputs. Set the compressor controls like this: Threshold set for +3dB , Ratio set for 6:1, turn on the Smart
switch for SKC mode, Attack set around 1ms, set the Release around 1 second. When the announcer
speaks, the music will duck down (turn the ratio up to duck it even lower). When the announcer finishes
speaking, the music will fade in at a rate set by the Release knob.
Limiter- Set the 3632 with a high ratio and a high threshold. Softer sections will remain uncompressed and
louder peaks will be kept under control. Set the Threshold so that the loudest sections get around -6 of
reduction, set the Ratio for 6:1, and turn on the Smart switch for SKC mode.
Noise gate- A noise gate is also a type of expander. Since hiss and noise are quieter than the sound of an
instrument, using a compressor as a gate, only the intentional sounds pass – everything else is lowered in
volume, reducing unwanted noise in a track. When the signal drops beneath the set threshold, the gate
activates.
De-Essing- Occasionally when recording vocals, high frequency "s" sounds can jump out louder than the
rest of the audio. By placing an equalizer in the sidechain, you can set the compressor so that only certain
frequency ranges trigger the unit to start compressing. Set the EQ to cut all frequencies except for the sibilant
range, between 3-6kHz. Then set the 3632 like this: Threshold set around 0dB, Ratio set for 6:1, Attack set at
1ms, Release set around 0.1ms.
Expander- An expander is a compressor in reverse and increases the dynamic range of the audio signal,
making quiet sounds even quieter by reducing the level of an audio signal that falls below a set threshold
level. Signals above the threshold remain at unity gain whereas signals below the threshold are reduced in
gain.
Rack Mounting
For secure mounting, a universal rack shelf can be used (available from various rack manufacturers or your
music dealer). The 3632 fits into a standard 19" rack space unit. Allow at least an additional 4" depth for
cabling on the rear panel. Be sure that there is enough air space around the unit for sufficient ventilation and
do not place the 3632 on high temperature devices such as power amplifiers etc. to avoid overheating.
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