CX335 Installation and Operation Manual V3.0 Cloud Electronics Limited 140 Staniforth Road, Sheffield, S9 3HF England Tel + 44 (0) 114 244 7051 Fax + 44 (0) 114 242 5462 E-mail info@cloud.co.uk Web site http://www.cloud.co.
CX335: Installation and Operation Manual Page 1 CX335 STEREO COMPRESSOR LIMITER Installation and Operation Manual CONTENTS Section 1 Safety Notes .....................................................................................3 2 ‘Quick Start’ ......................................................................................3 2a Soft Knee, Normal Envelope ..........................................................3 2b Hard Knee, Normal Envelope ..............................................
Page 2 CX335: Installation and Operation Manual CONTENTS (Cont..) Section 15-07-02 V3 Page 6h Gain Reduction Meter .................................................................12 6i Output Level Meter Displays ........................................................12 7 Operation ........................................................................................12 8 Technical Specification ...................................................................13 9 General Specification ..
CX335: Installation and Operation Manual 1 Page 3 Safety Notes • Do not expose the unit to water or moisture • Do not expose the unit to naked flames. • Do not block or restrict any air vent • Do not operate the unit in ambient temperatures above 35oC • Do not perform any internal adjustments unless you are qualified to do so and fully understand the hazards associated with mains operated equipment. • The unit has no user serviceable parts. Refer any servicing to qualified service personnel.
Page 4 CX335: Installation and Operation Manual 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.
CX335: Installation and Operation Manual 2c Page 5 Intelligent Limiter Due to the programme dependant nature of the compressor section and its split frequency stereo side chain, the preferred method of limiting is to use the compressor section with a ratio of ∞ to 1. Depress the knee switch and release the envelope switch. Set the threshold to the level where limiting is to commence. Set the ratio control fully clockwise.
Page 6 CX335: Installation and Operation Manual 2e Hard Knee, Slow Time Constant (Slow Envelope) This mode of operation will be the most noticeable (especially with high ratio settings and fast dance tracks) as the point where compression takes effect is at a definite audio level. Depress the knee and envelope switches. 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.
CX335: Installation and Operation Manual Page 7 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.
Page 8 CX335: Installation and Operation Manual VOLTS OPERATION FIT TWO LINKS FOR 110/120 TRANSFORMER 120V TRANSFORMER HIGH VOLTAGE VOLTS OPERATION HIGH VOLTAGE FIT ONE LINK FOR 220/240 240V 120V VIEW INSIDE CX335 SHOWING POSITION OF VOLTAGE SELECTION LINKS 1: Disconnect the unit from the mains. 2: Using a number 2 size pozidrive screwdriver, remove the six self-tapping screws retaining the top panel of the unit.
CX335: Installation and Operation Manual 5c Page 9 What is Hard-knee and Soft-knee? The actual threshold point where compression takes place is called the 'knee', the reason being that if a graphical representation of input level verses output level is made, then below threshold the line will be at 45° (output is the same as input). Above threshold this line will have a gentler slope equal to the ratio setting. So the line will have a definite 'fold' or 'knee'. (See diagram below).
Page 10 CX335: Installation and Operation Manual the level and frequency of the incoming signal. For this reason the Attack and Release controls have been removed from the front panel. 5f Gain requirements When the signal exceeds threshold and the compressor takes effect, there will be a reduction in the real output 'volume'. This volume reduction is made back up to the original level with the Gain control.
CX335: Installation and Operation Manual Page 11 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. 6b 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.
Page 12 6h CX335: Installation and Operation Manual 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.
CX335: Installation and Operation Manual Page 13 and set the ratio to its lowest setting of 1.2:1 although we do not recommend using the peak limiter without the support of the compressor section. 8 Technical Specifications 10kΩ INPUT IMPEDANCE +26dBu MAXIMUM INPUT LEVEL 80 Ω OUTPUT IMPEDANCE +26dBu MAXIMUM OUTPUT LEVEL 600Ω MINIMUM OUTPUT LOAD 20Hz to 20kHz ±0.
Page 14 CX335: Installation and Operation Manual CAUTION - Mains Fuse Replace the mains fuse only with the same type and rating as marked on the rear panel. The fuse body size is 20mm x 5mm. CAUTION – Servicing The unit contains no user serviceable parts. Refer servicing to qualified service personnel. Do not perform servicing unless you are qualified to do so. Disconnect the power cable from the unit before removing the top panel and do not make any internal adjustments with the unit switched on.
