Cloud CX335 Посібник з монтажу та експлуатації - Сторінка 8

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CX335: Installation and Operation Manual

Soft-knee compressors are often chosen in applications that call for less conspicuous level

control whereas ratio type hard knee compressors are generally considered more successful

where large amounts of gain reduction are required. By offering both alternatives, the

CX335 is capable of outstanding results in a very wide range of discotheque, studio and live

sound situations.

Compressors are often accused of dulling the sound being processed, and a little

explanation is needed to understand exactly why that is. Bass frequency sounds, which

contain most of the energy in a typical piece of music, cause a normal compressor to apply

gain reduction. This is fine until quieter, high frequency sounds occur at the same time as

that bass sound, these high frequencies will also be turned down in level simultaneously with

the bass and therefore suffer as a consequence. This is why the cymbals and hi-hats in a

heavily compressed track seem to dip in level whenever a loud bass drum or snare drum

beat occurs. The 'intelligent' side-chain of the CX335 will attempt to overcome this by

sensing the input frequency of the signal and adjusting itself accordingly.

Another feature of the CX335 is a highly effective peak limiter that allows the user to set an

absolute output level that can never be exceeded. This facility is extremely valuable for

speaker driver protection. With correct threshold and ratio adjustments the compressor

section can be set to act as a primary level controller with the peak limiter set above this to

perform secondary security.

Installation

Mounting

The CX335 is designed for standard 19" rack mounting and occupies 1U of rack space.

Avoid mounting the unit directly above power amplifiers or power supplies that radiate

significant amounts of heat and strong magnetic fields. Fibre or plastic washers may be

used to prevent the front panel becoming marked by the mounting bolts.

Audio Connections

The input 3pin XLR connectors may be used either balanced or unbalanced, the wiring

convention being: pin 2 hot, pin 3 cold and pin 1 ground. For use with unbalanced systems,

unbalancing can be achieved by shorting pin 3 of the XLR connectors to ground (pin 1) at

the inputs. In both modes of operation the systems input level should be referenced to

0dBu.

The CX335 is designed as a stereo compressor and always expects to be used with

matching left and right stereo signals. Unexpected and unusable results will occur if two

independent mono signals are fed through the unit. Furthermore, if the audio system being

processed is configured for mono operation you will have to connect an input signal to both

channels to make any sense of the front panel meter calibration and control graticules,

although only one output socket need be used.

If earth loop problems are encountered, do not disconnect the mains earth but instead,

operate the system in the balanced mode with the cable screen only connected at the

receiving end of the cables. If the system can only be operated in the unbalanced mode,

then we suggest that an audio isolating transformer be used.

UNDER NO CIRCUMSTANCES MUST ANY EARTH CONNECTIONS BE REMOVED.

Power Connection

The unit will have been configured to operate on a power input of 220 to 240 Volts AC at 40

to 60Hz. If for some reason the unit is to be used at a mains input operating voltage which is

different to that as supplied, the following procedure must be carried out. (See the diagram

on the following page)

15-07-02 V3

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