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Page 4

This is the recommended mode of operation, yielding the most musical results with the least

perceptible manipulation of the audio signal. Release both the envelope and knee switches.

Set the threshold to somewhere between 10dB and 15dB LOWER than your average input

level and set the ratio control somewhere between 5:1 and 10:1, if you require compression

of the audio signal, but 20:1 or higher if you require compression and limiting. With normal

programme level running through the CX335, rotate the gain control so that the output level

on the left and right channel VU meters measures about the same in bypass mode as it does

with the compressor operational.

With this configuration, the louder the input then the more compression will take place. A

distinguishable increase in average overall volume should be noted, although the peak

output level should be slightly lower.

The 'Peak' control operates independently from the compressor/limiter section of the

CX335. It has the advantage of allowing the user to directly set an absolute limit on the

maximum output level, however it has the disadvantage of not sounding as transparent as

the compressor. The compressor should be set to provide most of the gain reduction. The

peak limiter should be used as a safety net to protect the system when it is under abuse.

The peak control is best adjusted by using the highest anticipated input level and observing

the clip or peak indicators of the systems power amplifiers. The 'Peak' control should be set

to prevent any potentially damaging amount of clipping. Note that sometimes, on systems

with an active crossover, some clipping on the bass amplifiers may be acceptable. If the

peak LED on the CX335 is operating more than occasionally then the unit is not

adjusted for optimum performance and the compressor controls should be adjusted to

give more gain reduction.

Hard Knee, Fast Time Constant (Normal Envelope)

This mode of operation will be slightly more noticeable (especially with high ratio settings) as

the point where compression takes effect is at a definite audio level.

Depress the knee switch and release the envelope switch. Set the threshold to somewhere

between 0dB and 8dB LOWER than your maximum input level. Set the ratio control at about

5:1 or even higher, if you require compression of the audio signal, but 20:1 or higher if you

require compression and limiting. The higher the ratio the more audible the compression.

Turn the gain control so that the output level on each VU meter reads about the same in

bypass mode as it does with the compressor operational. Information on configuring the

peak control is described in detail in section 2a, page 4. (above).

With this configuration, quieter signals should pass through the compressor unprocessed,

(no gain reduction taking place) but louder input signals above the threshold level will have a

significant amount of compression (L.E.D'S will light on the gain reduction meter). The peak

limit LED will flicker ON more often than would normally be expected, especially with very

percussive tracks at high level. No perceived effect will be noticed until very high input levels

are used, then the CX335 will take control to preserve system integrity.

15-07-02 V3

CX335: Installation and Operation Manual