Compressor Controls; Threshold Control; Ratio Control; Figure 2 - Compressor Section - Art PRO CHANNEL II Service Manual

Compressor Controls

The ART Pro Channel II Compressor section consists of an above threshold Optical
Compressor/Limiter with adjustable slope. The attack and release controls allow a wide range of
adjustment while the complex detector assures fast response without distortion.

Threshold Control

This control sets the level, above which the Compressor in the Pro Channel II starts to act on the
input signal. As the control is turned clockwise, more input signal is required to begin reducing gain.
The compression action can be seen in the Gain Reduction LED meter.

Ratio Control

The RATIO control sets the amount of gain reduction that takes place based on how far the input
signal is over the threshold level (set by the THRESHOLD control). A good starting point for vocals is
2.5:1.
To have the unit act as a limiter, set the RATIO control to ∝:1
FIGURE 2 – Compressor Section
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