Crest Audio X-VCA Manuel d'utilisateur télécharger pdf (Page 47)

group dynamics section

The X-VCA Audio Group and Master modules include a number of features

for flexible dynamic control of signal levels. On Group modules, the com-

pressor and gate functions may be engaged separately or simultaneously. For

a comprehensive discussion of these features, see Section on Dynamics

Control Operation.

gate

The gate is used to attenuate or silence the signal when it's level falls below

a selected point (threshold).

THRESHOLD (THR) control (center knob of dual concentric control)

Adjusts the point at which any DECREASE in input signal level will

cause a further reduction in output level (gain) as determined by the ratio

control setting. Threshold may be set between -20db and -60db (and

below).

RATIO control (outside of dual concentric control)

Adjusts the proportion of output signal in relation to input signal

when operating BELOW the set gate threshold level. Ratio may be adjusted

from 1:1 to above 1:5. Gating demonstrates "soft knee" characteristics.

compressor

The compressor is used to reduce a signals dynamic range by the selected

ratio. It can also be configured to limit the signals output level.

GAIN (make up) control

Adjusts to make up for apparent gain loss due to compression of input

signals. In the Solo Pre position (default), the output of the dynamics sec-

tion can be viewed before the VCA control system fader. The gain control

should be adjusted to show near 0 reference level when normal signals are

present. The GAIN control has a range of 0db to +20db.

RATIO control

Adjusts the proportion of output signal in relation to input signal above

the set threshold level. The ratio of input to output signal may be adjusted

from 1:1 to greater than 20:1 (hard limiting).

THRESHOLD (THR) control

Adjusts point at which any increase in input signal to the

compressor/limiter section will cause a reduction in output level at a rate

determined by the ratio control setting. The threshold may be set between

-45db and +15db.

COMP-GATE stereo link

Links the odd and even GROUP's dynamics sections for stereo opera-

tion. The GROUP with the highest amount of auto-attenuation controls the

dynamics sections for both groups in the odd/even pair.

p. 47

group module

NOTE: This dynamics

section is intended for

use by an experienced oper-

ator. It's best to be familiar

with compressors and lim-

iters before using them in

critical applications!

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Crest Audio X-VCA Manuel d'utilisateur Page 47

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