CX335 Compressor-Limiter CX 335 GAIN REDUCTION OUTPUT DISPLAY KNEE NORMAL SOFT SLOW HARD THRESHOLD -10 L 30 20 15 10 Power ENVELOPE 6 4 2 1 0dB -20 -16 -12 -8 -4 0dB +4 +8 +12 3 -20 dBu 1.2 :1 - 10 20 5 GAIN PEAK 5 10 -15 1.5 +10 R RATIO 2 0 Split Band Compressor-Limiter 6 15 0 4 + BYPASS 4 3 0 -2 -4 20 26 -6 dBu 8 8 12 LIMIT NORMAL 12 dB BYPASS Installation Guide CX335 User Manual v1.
Important Safety Instructions WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture. CAUTION: Use of controls or adjustments or performance of procedures other than those specified may result in hazardous radiation exposure.
Contents Important Safety Instructions...................... 2 Safety Information......................................... 4 Safety notes regarding installation....................... 4 Conformities............................................................. 4 Power supply............................................................ 4 CAUTION – Servicing........................................... 4 General Description....................................... 5 CX335 main features..............................
Safety Information Safety notes regarding installation • • • • • • • Do not expose this 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 45°C The unit has no internal user adjustable parts. Do not remove any panel. Refer any servicing to qualified service personnel.
General Description The Cloud CX335 is a two-channel compressor-limiter designed for permanent installation as part of the sound system in a pub, club, bar or similar premises where automatic, fool-proof control of the maximum sound level is required. The automatic nature of its operation permits the number of controls to be reduced, making setting up on-site a simple procedure.
Block Diagram Mixer or Zoner Loudspeaker Systems Audio Sources Example System Signal Path (see “Signal path considerations” on page 8) Multi-Channel Amplifier. CX335 Front panel descriptions C X 335 GAIN REDUCTION OUTPUT DISPLAY 30 20 15 10 1 1. 2. 3. 4. 5. 6. 7. KNEE NORMAL SOFT THRESHOLD SLOW HARD dBu :1 dBu LIMIT dB 7 8 2 3 4 5 6 -10 L 6 4 2 1 0dB -20 -16 -12 -8 -4 0dB +4 +8 +12 11 10 RATIO 2 3 -20 1.2 - 10 20 5 GAIN PEAK 5 10 -15 1.
Rear panel descriptions 13 14 13 14 15 18 17 16 13. INPUTS – 2 x XLR3F connectors: electronically-balanced inputs left and right channels. 14. OUTPUTS – 2 x XLR3M connectors: electronically-balanced outputs for left and right channels. 15. EXTERNAL VCA INTERFACE – 9-pin female Dsub connector for external DC control of VCA; this connector may be used for remote muting or remote volume control purposes. 16. IEC power connector 17. AC mains fuse 18. Chassis ground terminal CX335 User Manual v1.
Installation Mechanical The CX335 is suitable for mounting in a standard 19” equipment rack. It occupies one unit of rack space (1U). The unit is 155 mm deep, but the rack should have at least 225 mm of depth available to permit clearance of the rear panel connectors. Wherever possible, avoid positioning the units in close proximity to strong magnetic fields or equipment which may operate at a high temperature (e.g., high power amplifiers). The CX335 is convection-cooled and generates no significant heat.
cable can be used when connecting to an unbalanced destination. Wire the inputs to the source devices using the convention shown below: emergency situation; in this case, the relay would probably be part of the building’s fire alarm system.
Operating principles Compression Compression is an audio process that progressively reduces the dynamic range of programme material once the signal level has risen above a pre-set threshold. No treatment is applied to signals below the threshold; the output of the compressor will be the same as the input, and any change in signal level will be reflected accurately at the output.
and will generally sound bad in different ways at different frequencies. For instance, too fast an attack time at low frequencies will cause distortion as the gain reduction may change during one cycle. On the other hand, too slow an attack time at high frequencies will not process the signal peaks quick enough, resulting in the possibility of system clipping and lack of speaker protection. The conclusion is that for most music programme material, a fixed attack time is virtually useless.
‘peak’) indicators on the system’s power amplifiers. PEAK should be set so that the amplifiers do not clip at even the highest signal levels. The idea is that the CX335’s peak limiter should be active, not the clip protection in the amplifier. The red LIMIT LED adjacent to the PEAK control shows when the peak limiter is applying limiting.
With this setting, lower level signals will pass through the compressor unprocessed, but any signal exceeding the threshold will produce a definite maximum output level that will never be exceeded (the gain reduction meter will confirm compressor action). The LIMIT LED should never illuminate if PEAK is set correctly (turn it up if the LED does illuminate).
EMC considerations Appendix Changing the AC Voltage setting IMPORTANT: This procedure should be not be attempted by anyone who is not competent to solder/desolder small components from printed circuit boards. If you are not suitably experienced, please refer this procedure to qualified service personnel. 5. Turn the unit over.
Technical Specifications Performance Inputs Outputs Compressor General Frequency Response 20 Hz – 20 kHz, ±0.5 dB Distortion @1 kHz <0.02%, (0 dBu, unity gain); <0.1% (+10 dBu input, 10 dB gain reduction) Distortion @10 kHz & 100 Hz <0.03%, (0 dBu, unity gain); <0.1% (+10 dBu input, 10 dB gain reduction) Noise <-90 dB, unity gain, unweighted, 22 Hz – 22 kHz Type & connectors Electronically balanced, XLR3F Input Impedance 10 kohms Max.
Cloud Electronics Limited 140 Staniforth Road Sheffield S9 3HF England Tel: +44 (0)114 244 7051 Fax: +44 (0)114 242 5462 email: info@cloud.co.uk web: www.cloud.co.
