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CX335: Installation and Operation Manual

threshold for periods of a second or more. If this switch is depressed it is strongly advised

that the peak limiter should be used as an additional tool to restrain very loud and quick

dynamic peaks.

Knee switch

In the hard position it modifies the knee of the compressor by affecting the ratio control so

that gain reduction takes place linearly once the threshold level is exceeded. It is strongly

advised that the unit be configured in its intended mode of soft-knee for a more transparent

compression.

Threshold

This control determines the input level above which gain reduction will be applied and may

be set in the range +10dB to -20dB. This control graticule is accurate for compression with

the knee switch depressed. In the soft-knee mode, compression takes place gradually once

the threshold is just exceeded. The amount of compression rises, until the input signal

reaches approximately 10dB above the threshold setting, where upon conventional

compression is applied at the amount dictated by the ratio control.

Ratio

With the knee switch depressed, this control governs by how much the input level must rise

before a rise of 1dB would be seen at the output. For example, (In hard-knee mode) with the

input signal level above the threshold setting, a ratio setting of 5:1 would imply that the

output would only rise by 1dB with a 5dB rise in the input level.

With the compressor set for soft-knee, ratio fixes the final compression ratio that will be

applied once the 10dB soft-knee region is exceeded. The ratio may be continuously

adjusted from 1.2:1 to ∞: 1 allowing the possibility of true hard limiting.

Gain

The output level may be attenuated or amplified by up to 12dB to compensate for level

changes caused by compression and limiting. Quite often compressors are perceived to

'reduce' the total output level, this control should normally be adjusted so that the output

level measures identical levels on the VU meters with bypass depressed and released. The

gain control can also be set audibly if the system speakers are within unobstructed earshot.

Normally this control will be operated rotated to the positive (clockwise) gain side.

This control comes before the peak limiter detector and this fact should be taken into

account when setting the peak limiter threshold.

Peak Limit

Sets an absolute limit to the level that the output signal will not be permitted to exceed. The

control ranges from +26dBu (where the limiter has no effect) down to -6dBu. This limiter is

very fast acting enabling it to control any peaks without audible distortion. If the output signal

is so high as to cause the limiter to operate for more than 20mS, the system gain is

automatically reduced to bring the signal back within range. The system gain is then

returned to normal over a period of approximately one-second. The peak limit control and

the compressor gain control should be used in conjunction to ensure that the peak limiter

operates only rarely (if at all), if it is to be used purely for peak protection.

Bypass

This switch causes a bypass of all signal processing, where the input signal is routed directly

to the output socket. Normally the switch is used to compare the raw unprocessed signal

against the effects of any compression and or limiting.

15-07-02 V3

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