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CX261 Installation and User Guide v1.5

6

OVERVIEW

Introduction

The Cloud CX261 is a 1U rack-mounting stereo audio mixer 
intended for use in multi-use areas where simple control of 

high-quality background music needs to be combined with a 

flexible range of paging options.

The CX261 mixes any one of six stereo line inputs with one 
or two microphone inputs. Separate controls for music and 
mic levels are provided, and music source selection and level 
may be controlled remotely if wished, either using standard 
Cloud remote control plates, or from an AV control system 

(e.g., Crestron, AMX, etc.). As well as the main output, there 

is a transformer-isolated mono auxiliary output which is 

suitable for providing a MOH (Music On Hold) output to a 

telephone system.

The mixer may be configured to operate with most paging 
systems:  either  mic  input  may  be  activated  by  voice  (VOX) 

or short-to-ground access connections, and MIC 1 may have 
priority over MIC 2 if wished. Also, one line input may have 
priority over any other selected to facilitate connection of a 
digital sound store or similar device.
A front panel 3.5 mm jack input permits easy connection of a 
portable MP3 player, laptop or similar, with independent level 

control.

A  switchable  isolating  transformer  configures  MIC  1  input 

for direct connection to a telephone system, enabling paging 

messages to originate from an extension.
EQ cards to suit various installed-sound loudspeakers may be 

fitted to either or both channels.

A Music Mute input is provided to allow external systems 

such as fire alarm panels to disable background music in the 

event of an emergency. This is a function that may be required 

by Local Authority regulations.

What’s in the box

Unpack the CX261 and its accessories with care. It is always a 

good idea to store all packaging (if practical), in case you ever 

need to return the unit to your Cloud dealer for any reason.
As well as this manual, the shipping carton should contain 

the items listed below. Please contact your Cloud dealer 
immediately if any of them are missing or damaged.

• 

Cloud CX261 Zone Mixer

• 

IEC mains lead (AC cord) with moulded plug appropriate 

to the territory

• 

Set of mating connectors for all rear panel screw-terminal 
connectors

Main Features

• 

Stereo mic/line mixer for installed audio applications

• 

Six (unbalanced) stereo line inputs with individual gain 

controls

• 

Two electronically balanced mic inputs

• 

Front panel control of music source/level and both mic 
levels

• 

Front panel input (3.5 mm jack) for MP3 player, etc., with 
gain control (overrides rear panel LINE 1 input) and 

LED level indication

• 

Separate HF & LF EQ adjustments for music and mic 

sources

• 

Bi-colour LEDs to aid mic gain adjustment

• 

MIC 1 input configurable as transformer-isolated line 

input (with separate gain control) for connection to 

phone system 

• 

MIC 1 priority over MIC 2 (selectable) 

• 

Short-to-ground access connector or VOX-triggered 
voice-over-music priority on both MIC 1 and MIC 2 

inputs 

• 

Selectable LINE 6 priority with choice of release times

• 

Music Mute control input (N/O or N/C) for interface to 

emergency system

• 

Compatible with standard Cloud remote control plates: 

RL-1 Series (music level) and RSL-6 Series (music level 

and source selection) 

• 

Electronically-balanced stereo main output

• 

Mixer can be configured by internal jumper for mono 

operation

• 

Transformer-isolated mono auxiliary output for use with 
telephone MOH systems

• 

Aux output source selection (internal jumper) – follows 

main output or always LINE 2 

• 

Optional speaker EQ cards available

• 

1U 19” rack mounting unit

Summary of Contents for CX261

Page 1: ...CX261 Installation and User Guide v1 5 CX261 MP3 Zone Mixer Installation and User Guide...

Page 2: ...re Considerations 10 Power Supply 10 Fuses and ratings 10 System Connections 10 Music Sources 10 Front panel MP3 input 11 Microphone inputs 11 Paging Access Control 11 Main Output 12 MOH Auxiliary Out...

Page 3: ...17 Microphone Over Music Priority 17 Mic 1 Over Mic 2 Priority 17 OPTIONS AND ADDITIONAL INFORMATION 18 RL 1 Series and RSL 6 Series remote control plates general considerations 18 Control of music s...

Page 4: ...magnitude to constitute a risk of electric shock The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing ins...

Page 5: ...equire installation by a qualified person CAUTION Mains Fuse Replace the mains fuse only with the same type and rating as marked on the rear panel Fuse type T1AH 250V Fuse rating 1 A Fuse Size 20 mm x...

Page 6: ...uthority regulations What s in the box Unpack the CX261 and its accessories with care It is always a good idea to store all packaging if practical in case you ever need to return the unit to your Clou...

Page 7: ...CX261 Installation and User Guide v1 5 7 Block Diagram...

Page 8: ...n of non permanent external source 5 MP3 GAIN adjusts gain of the MP3 input 6 LINE 1 MP3 LED indicates green when the MP3 input is enabled 7 SIGNAL INDICATOR 3 LEDs green yellow red indicating level o...

Page 9: ...for mic channel 8 MICS LEDs bicolour LEDs to aid mic level adjustment 9 MIC TEL push button switch press in to reconfigure MIC 1 input for use with telephone system 10 TEL GAIN MIC 1 input gain adjus...

Page 10: ...y be connected to either the left or the right input but see Stereo mono operation on page 16 re configuring main output for mono operation The sensitivity range available should allow most standard i...

Page 11: ...ompatible telephone system This permits announcements to be made from some or any internal telephone extensions in a building Not all telephone systems are suitable for this application and the system...

Page 12: ...d L R mono sum of the music channel This is intended to provide a continuous music feed for use with a telephone system If it is not required for this it may be used as a auxiliary mono output for ano...

Page 13: ...y setting the adjacent LOC REM push button switch 16 on page 9 to REM i e pressing it in In this setting the front panel MUSIC LEVEL and SOURCE controls become inoperative Music Mute External muting o...

Page 14: ...tch To allow for the wide range of signal levels which may be encountered from portable audio devices the MP3 input is provided with its own level control and signal level LEDs 5 and 7 respectively at...

Page 15: ...require a higher phantom voltage and thus necessitate an external PSU To enable phantom power at the mic inputs the internal PCB jumpers J1 Mic 1 and or J2 Mic 2 should be moved to their ON positions...

Page 16: ...that the signal at this output is NOT altered by the front panel MUSIC LEVEL control or the rear panel MUSIC EQ preset adjustments Source Selection If the output is to be used as an auxiliary mono fe...

Page 17: ...e microphone input The alternative ACC jumper setting triggers the priority by contact closure when the access contacts are enabled ACC priority should only be selected when a suitable paging micropho...

Page 18: ...current from the mixer Control of music source and level via external DC It may be necessary in some installations to adjust the music level and select music source from an external control system e g...

Page 19: ...ne to a particular line input INPUT DCVOLTAGE RESISTORVALUE OFF 9 0V Line 1 7 5V 16k Line 2 6 0V 11k Line 3 4 5V 6k8 Line 4 3 0V 3k9 Line 5 1 5V 1k8 Line 6 0V short circuit Note that there is an inter...

Page 20: ...source selection L2 MOH Auxiliary output is always LINE 2 SEL J9 Music Mute configuration NO external contact closure required for muting NC external contact opening required for muting NO J10 MIC 1...

Page 21: ...sconnecting the input leads both left right channels on each line input until the hum disappears This problem is often caused by terminating a screened input cable into a signal source positioned a si...

Page 22: ...tion 0 05 20 Hz to 22 kHz Sensitivity 10 dBu to 50 dBu Gain range 40 dB Input impedance 2 kohms balanced Common mode rejection 70 dB 1 kHz Headroom 20 dB Noise 125 dB EIN 20 Hz to 22 kHz 150 ohms sour...

Page 23: ...CX261 Installation and User Guide v1 5 23...

Page 24: ...www cloud co uk www cloudusa pro...

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