Cloud CX335 Manuale di installazione e funzionamento - Pagina 13

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Gain Reduction Meter

A nine-segment LED bar graph meter continuously monitors the gain reduction applied by

the compressor and or limiter and even any remote control voltage over the range 0 to 30dB.

The amount of gain reduction shown is greatly affected by all of the front panel controls.

Output Level Meters

These are nine segment LED bar graph level meters, that monitor the level of the two output

signals over the range -20dB to +12dB with reference to the 0dBu operating level. With

average stereo programme these will track together. Vastly differing levels will most likely be

a cable short or external system configuration fault.

Operation

The unit should be connected in line with the stereo signals to be processed either by

breaking the existing connection between mixer console and cross-over or amplifiers or via

suitable insert points on the master outputs of the console (if such exist).

Setting up the front panel controls is easiest if the peak limiter threshold is initially set to

maximum. This allows the compressor to be set up in isolation. The ratio setting depends

on how firmly the signal dynamics need controlling; commonly, higher ratios provide a higher

degree of control but also tend to be more audible in operation when high levels of gain

reduction are required. The integral soft-knee feature of the CX335 renders these effects far

less pronounced, but this factor should still be taken into consideration when setting up.

Although, with the CX335 a higher compression ratio may be used than that of conventional

compressors without compromising the sound quality.

Adjust the threshold control until the desired amount of gain reduction occurs. This is judged

partly by ear and partly by observing the gain reduction meter. In general, a maximum gain

reduction of between 6dB and 10dB will be adequate. When in the soft knee mode, you will

notice that the threshold control is rotated clockwise more than would normally be expected.

Set the gain control to give the required output level using the level meter to guide you.

Additional assistance can be obtained by toggling between bypass mode and normal

compressor operation, in both modes the optimum gain setting will give equal output levels

on the meter, but a slight increase in the 'music power' with the compressor operating. Avoid

running at very high output levels as this reduces the available amount of signal headroom

and could lead to distortion in extreme cases.

Once the gain is correct, set the peak limiter level control so that the limiter LED only lights

briefly on extreme signal peaks. Alternatively, set the peak limiter level to the desired

maximum output value and then adjust the compressor gain control to ensure minimum

limiter activity. One major use of the peak limit control is to prevent input distortion or

clipping on the following amplifiers. If only peak limiting is required then we suggest setting

the compressor ratio to greater than 1:20, the compressor threshold to at least 12dB lower

than the normal input level and using the soft-knee mode as opposed to using the peak

limiter alone.

The peak limiter has no separate on / off control, but turning the peak Level control fully

clockwise will prevent any unwanted limiter action. To effectively bypass the compressor

section turn the compressor threshold up to its maximum of +10dB (fully counter-clockwise)

15-07-02 V3

CX335: Installation and Operation Manual