dbx Compression 101 Podręcznik - Strona 7

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The trick is to set the EQ to cut all frequencies except for the sibilant range, between 3-

6kHz.Then set the compressor like this:

Threshold set around 0dB

Ratio set for 6:1

Hardknee active

Attack set at minimum

Release set around 8 o'clock

The Threshold should be set so that an "s" triggers about -3 to -6 dB of compression.

If other sounds are triggering the compressor, you might need to adjust the EQ

cutoff frequencies.

Ducking

Ducking is often used when doing voiceovers. It allows background music to automatically

be turned down whenever an external source, such as an announcer's voice, begins to

speak.You can also use ducking to have one instrument push the other out of the way, such

as the bass guitar ducking every time the kick drum hits.

To make the compressor into a ducker, plug the source into the inputs and plug the trigger

into the sidechain.The Sidechain return isn't used in this example. In the example below,

the sound of a radio announcer's voice will automatically turn the music down when he

speaks and it will slowly fade back in after he stops:

Set the compressor controls like this:

Threshold set for +3dB (around 3 o'clock)

Ratio set for 6:1

OverEasy® in

Attack set around 9 o'clock

Release set around 2 o'clock

Plug the announcer's Mic into the mixer, and feed that Mic to the compressor's

Sidechain in. When the announcer speaks, the music will duck down (turns the

ratio up to duck it even lower). When he finishes speaking, the music will fade

back up at a rate set by the Release knob.

Pumping and Breathing

When a compressor is making large changes to the input signal (10 to 12 dB or more); the

noise floor will also rise and fall with the signal level.When this noise signal rises and falls

drastically between signals, such as a heavily compressed, noisy drum track, you might hear

the noise level "breathing" between drum hits. One solution to this breathing problem is to

turn up there release time.This way, the noise floor won't have time to rise between drum

hits.

However, if the Release time is too long, lower level signals after the peak will be lost as the

compressor slowly stops reducing gain. this is called "pumping" as the lower level signals

(noise included) slowly fade back up to their normal signal level. the secret to avoiding

these problems is to achieve a balanced release time on the input signal.

Compression 101 - November 1998

Compression 101

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