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Cloud CX133 Installation & User Manual

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CX133 Zone Mixer 

Installation & User Guide 

V9.0

 

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.uk

 

 


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CX133:

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NSTALLATION AND OPERATION MANUAL

  

 

 

CX133 ZONE MIXER 

Installation and operation manual 

 

Contents

 

 
 
 

Section

  

Page

 

 1 

Safety 

Notes...............................................................................2 

 

2 General 

Description ...................................................................2 

 3 

Schematic Diagram....................................................................2 

 4 

Music 

Inputs ...............................................................................2 

  4.1 

Sensitivity 

& Gain Control.....................................................2 

  4.2 

Music 

Source Select.............................................................3 

 

 

4.3 Music Level Control, Local or Remote..................................3  

 5 

Mono 

Operation .........................................................................4 

 6 

Music 

Priority..............................................................................4 

 7 

Microphone Input .......................................................................5 

  7.01 

Microphone Input ...............................................................5 

  7.02 

Gain 

Control .......................................................................5 

 

Front Panel Level Controls.........................................................5 

 9 

Microphone 

Equalisation ............................................................5 

 10 

Microphone 

Priority ....................................................................5 

 

11 

Inhibiting Mic or Music Sections .................................................5 

 12 

Zone 

outputs ..............................................................................6 

 

 

12.1 Music Equalisation .............................................................6 

 13 

Utility 

Output...............................................................................6 

 

14 

Music Mute (Fire Alarm Interface) ..............................................7 

 15 

General 

Notes ............................................................................7 

  15.1 

Multi-zone 

Applications ......................................................7 

 

 

15.2 EMC Considerations ..........................................................7 

  15.3 

Earthing..............................................................................7 

  15.4 

Unbalanced Mode ..............................................................8 

 16 

Technical 

Specifications.............................................................8 

 17 

General 

Specifications ...............................................................8 

29/05/02 V9 

 


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1 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 35

o

• 

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. 

• 

If the moulded plug is cut off the lead for any reason, the discarded plug is a 
potential hazard and should be disposed of in a responsible manner.

 

For more detailed information refer to the rear of the manual. 

 

2 General 

Description 

The Cloud CX133 is versatile audio mixer with applications in Licensed, Retail and Leisure 
venues. The unit has facilities for three stereo line signals and one microphone signal that 
can be fed, in stereo, to two areas, each with a front panel mounted music source select 
switch and adjacent music level and microphone level controls. In addition, a fixed level 
‘Utility’ output is provided to serve general utility areas such as toilets and foyers etc. All pre-
set controls are located on the rear panel with additional configuration jumpers mounted on 
the printed circuit board. Remote level controls can be wired to the two stereo zones for 
applications that require remote control of the music level. 

 

3 Schematic 

diagram 

 
4 Music 

Inputs 

The unit has three stereo line inputs; these are suitable for most music sources such as 
compact disc players, tape players, satellite receivers and the like. All inputs are unbalanced 
and use RCA phono sockets. The input impedance is 47k ohms. The Line 3 input can be 
configured to have priority over any other music source, see section 6. 

 

4.1 

Sensitivity & Gain Control 

All three stereo line inputs have a pre-set gain control on the rear panel adjacent to the 
respective input socket. The gain control has a range of 20dB allowing the input sensitivity to 
be varied from -12dBu (200mV) to +8dBu (2.0V). The pre-set gain control should be set so 
that all the input signals are operating at the same level and that the front panel level control 
has an optimum range of control. 
 
 
 

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4.2 

Music Source Select 

Each zone has an independent source select control. The three position switch is used to 
select the desired music signal. Use the supplied label pack to identify the signal sources on 
the front panel. Line 3 input can be configured to have priority over any other selected signal, 
see section 6 for full details. The Utility output can operate with the Zone 1 music 
programme, Line 1 input or just the microphone; see section 13 for full details. 

 

4.3 

Music Level Control, Local or Remote 

A front panel mounted music level control is provided for each of the two main zones. 
Remote control of the Zone 1 and Zone 2 music level is possible by connecting a remote 
level control plate (RL-1) to the 4 pole connector on the rear panel of the CX133 (see 
connection diagram Figure 1 below). Either or both of the two main zones can operate in the 
‘split’ mode where two remote level plates can be wired to control the left and right outputs 
independently. When operating in the ‘split’ mode, the respective zone of the CX133 should 
be configured to operate in the mono mode (see section 5 'Mono Operation'). The front panel 
level control can be defeated by configuring the relevant internal jumpers, see Figure 3 for 
full details. Use two core screened cable to connect the remote level plate (maximum length 
100metres). 
Full wiring details are also printed on the underside of the CX133. 

 

REMOTE LEVEL CONTROL WIRING

STANDARD WIRING CONVENTION

FOR APPLICATIONS WITH ONE RL-1 FOR EACH ZONE 

USE TWO CORE SCREENED CABLE

CX133

4 POLE 

CONNECTOR

RL-1

1

2

3

4

1

2

3

REMOTE LEVEL CONTROL WIRING  -  USE TWO CORE SCREENED CABLE

SPLIT MODE  -  WITH INDEPENDANT CONTROL OF LEFT AND RIGHT OUTPUTS

EACH ZONE CAN BE SPLIT INTO TWO SUB ZONES

THE RESPECTIVE ZONE SHOULD BE CONFIGURED TO OPERATE IN MONO WHEN
THIS FACILITY IS UTILISED

RL-1

1

2

3

RL-1

1

2

3

LEFT OUTPUT

LEVEL CONTROL

RIGHT OUTPUT

LEVEL CONTROL

SPLIT MODE

CX133

4 POLE

CONNECTOR

1

2

3

4

Figure 1 

Figure 2 

 

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Figure 3 

 
5 Mono 

Operation 

MONO / STEREO OPERATION

WHEN OPERATING IN MONO USE EITHER OUTPUT

DISCONNECT POWER BEFORE REMOVING TOP PANEL

STEREO

MONO

J3  =  ZONE  1

STEREO

MONO

J1  =  ZONE  2

Internal jumpers allow either zone to operate in 
mono (see Figure 4). In the mono mode of 
operation, both the left and right output sockets 
carry the same mono signal and either or both 
sockets can be used. Separate remote control of 
the mono signal on the left and right output 
socket can be achieved by wiring two RL-1 
control plates to the 4 pin connector as shown in 
Figure 2 When this feature is used, we suggest 
that the respective front panel level control is 
defeated (see section 4.3). 

 

Figure 4 

6 Priority 

When a Juke Box or Spot Announce Player is connected to the CX133, fully automatic 
priority over any selected line input can be achieved by using the Line 3 input and 
configuring the relevant internal jumpers (see Figure 3). When this mode of operation is 
selected, the unit will operate normally until a signal is detected on line 3 and this causes the 
selected signal (usually background music) to mute, allowing the signal on line 3 to operate 
with priority. Once the signal on line 3 ceases, the selected signal will smoothly restore to its 
former level. The time taken for the selected signal to be restored can be set at 3, 6 or 12 
seconds by fitting the appropriate jumper (J5) on the printed circuit board. The line 3 priority 
option can be configured to operate on either or both zone outputs. 

LINE  3  PRIORITY

IMPORTANT! DISCONNECT THE POWER CABLE BEFORE REMOVING TOP PANEL

PLACE THE JUMPERS ON ONE PIN WHEN SELECTING 'OFF'

J6

J7

J5

LINE 3 PRIORITY

RELEASE TIME

LINE 3

PRIORITY

OFF

ON

ZONE  1

OFF

ON

ZONE  2

3  SECONDS

6  SECONDS

12  SECONDS

Figure 5 

 
The Line 3 priority does not operate on the Utility Output, however we have included the 
option to select the utility zone to operate with Line 3 priority if preferred – please contact our 
Technical Help team for full details. 

 

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7 Microphone 

Input 

 

7.01 Microphone 

Input 

A microphone input is provided and the microphone amplifier is an electronically balanced, 
transformerless design configured for optimum low noise performance. The input impedance 
is greater than 2k

 and is suitable for microphones in the 200 to 600 ohm range. Input is via 

a gold plated 3-pin XLR type connector with latch, which is positioned on the rear panel. For 
balanced microphones, connect the cable screen to pin 1, the in phase signal to pin 2 and 
the reverse phase to pin 3.  To operate the channel in the unbalanced mode, connect pin 3 
to pin 1 (ground) inside the XLR cable plug. Use pin 2 as hot and pin 1 as screen (ground) 

Figure 6 

BALANCED

GROUND  (SCREEN)

REV - PHASE (-)

IN - PHASE (+)

MIC INPUT

TERMINATION

1

2

3

1

2

3

LINK PIN 3 TO PIN 1

HOT  (+)

UNBALANCED

GROUND  (SCREEN)

 

7.02 Gain 

Control 

A pre-set gain control is provided adjacent to the XLR input connector. The gain can be 
adjusted from 0dB to 60dB and this wide range of gain allows direct connection of high 
output devices such as radio microphones without the need for additional attenuation. A high 
overload margin is maintained at all gain settings. 

 

Front Panel Level Controls. 

A separate microphone level control is provided for both Zone 1 and Zone 2 and these 
provide the user with a convenient means to operate the microphone at a suitable level in 
the zone of their choice. The microphone signal is routed directly to the respective output 
stage and is unaffected by the operation of the music level control. The gain control on the 
rear panel should be set at a level where it is not possible to have excessive gain even when 
the front panel level controls are fully clockwise. Self adhesive labels are provided to 
customise the controls. 

 

9 Microphone 

Equalisation 

The microphone channel has both a fixed high pass filter and independent pre-set 
equalisation controls positioned on the rear panel. The filter attenuates the signal below 
100Hz and the tone controls provide 

±

10dB at 100Hz and 5kHz. 

 

10 Microphone 

Priority 

Fully automatic, voice operated priority is provided for the microphone channel. A priority 
on/off switch is positioned on the rear panel. With the priority function switched on, when a 
microphone signal is detected, the music signal is attenuated, allowing the message to be 
clearly heard; normal music operation is restored smoothly after the announcement has 
been made. Once switched on, the mic priority will operate on Zone 1, Zone 2 & the Utility 
Output. 

 

11 

Inhibiting mic or music sections 

If the CX133 is required to provide a microphone signal, without any music programme, the 
mixer can be configured to operate with the music channel disabled by simply removing the 
two resistors R72 & R162 for zone 1 and R54 & R55 for zone 2. If there is a requirement to 
operate either zone with the microphone channel disabled, remove R68 & R138 for zone 1 
and R50 & R164 for zone 2. 

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12 Zone 

Outputs 

The two stereo output zones have balanced output stages using 3 pin XLR type connectors 
and can operate into loads as low as 600

. The nominal output level is 0dBu (775mV) but 

the CX133 can operate with a wide range of signal levels up to a maximum output of +20dBu 
(7.75V). A 3-pin XLR type female connector is required for each output.   
 
 
 
 
 
 
 

OUTPUT

TERMINATION

BALANCED

UNBALANCED

HOT  (+)

GROUND  (SCREEN)

1

3

2

NO CONNECTION TO PIN 3

GROUND  (SCREEN)

REV - PHASE (-)

IN - PHASE (+)

1

2

3

Figure 7 

For balanced interconnections, 2-core screened cable should be used.  Connect the cable 
screen to pin 1.  Pin 2 is the in phase signal (normally red) and pin 3 is the reverse phase 
signal (normally blue or black).  If you plan to connect any zone output to an unbalanced 
load, see section 15.4 'Unbalanced Mode'. Full connection details are printed on the 
underside of the CX133. 

 

12.1 Music 

Equalisation 

Both Zone 1 and Zone 2 have separate pre-set treble and bass controls for the music signals 
only. These pre-set controls are located on the rear panel adjacent to the respective zone 
output sockets. The music treble control has a range of 

±

10dB at 10kHz and the music bass 

control operates with a range of 

±

10dB at 50Hz.  

 

13 Utility 

Output 

The CX133 is fitted with a fixed level, balanced output primarily intended to provide a mono 
signal for utility areas such as toilets and foyers where it is desirable to feed a music + mic 
programme at a constant level, totally independent of the variable programmes of Zone 1&2. 

Figure 8 

 

The utility output has a choice of three input sources, selected by a PCB mounted jumper. 
The CX133 leaves the factory configured to provide a music signal derived from the Zone 1 
music source selector (pre-level control). Alternatively, the jumper J8 can be set to source 
the music signal directly from the Line 1 input (see Figure 8). A pre-set microphone level 
control, positioned adjacent to the output socket can be set to provide microphone signals at 
the optimum level; if the priority function is switched on, the music signals will attenuate 
when an announcement is made. If the music source jumpers are removed, the output can 
be used as a microphone only signal to serve areas requiring music free announcements. 

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14 

Music Mute (Fire Alarm Interface) 

In certain installations, such as licensed premises or 
retail outlets within a shopping mall, there may be a 
local authority or fire service requirement to mute the 
music signals via a fire alarm control panel in an alarm 
condition. The CX133 provides a facility to mute the 
music signals only, by using a fully isolated pair of 
contacts 

(usually a relay mounted close to the CX133 

which is powered by the fire alarm control panel

which should close during an alarm condition (

the 

installation of this relay is normally undertaken by the 
fire alarm installation company

).  The front panel 

mounted 'Music Mute' LED will illuminate to indicate 
the operation of the mute circuit. 

1

2

RELAY

CX133

2 POLE

CONNECTOR

THE RELAY CONTACT MUST BE VOLTAGE

FREE AND FULLY FLOATING

REMOTE MUSIC MUTE TERMINATIONS

Figure 9 

15 General 

Notes 

 

15.1 Multi-zone 

Applications 

Where the sound system specification calls for separate control in more than 2 zones, the 
CX133 can be used in multiples. The signal sources can be connected to several inputs as 
required but care must be taken to ensure that the output stage of the signal source is 
capable of driving a lower impedance load. The impedance of the line input stage is 47k

 

and it would be reasonable to assume that most op-amp based signal sources should drive a 
10k

 load, thus allowing up to five parallel circuits. The input impedance of the microphone 

amplifier is 2.4k

 making it suitable for a microphone with a maximum impedance of 600

A single 200

 microphone could therefore be connected to three balanced inputs. To avoid 

any problems associated with differences in mains supply earthing, we recommend that all 
the CX133's used in a multi-zone application should be located close together and 
connected to a common mains supply. 

 

15.2 EMC 

Considerations 

The CX133 fully conforms to the relevant electromagnetic compatibility (EMC) standards and 
is technically well behaved; you should experience no problems interfacing the unit to other 
items of equipment and under normal circumstances no special precautions need to be 
taken. If the unit is to be used within close proximity to potential sources of HF disturbance 
such as high power communication transmitters, radar stations and the like, it is suggested 
that the cable screen be connected to the shell of the XLR type connector and the line input 
signal leads be kept as short as possible. Always use balanced interconnections wherever 
possible.  If the CX133 is mounted in a 19” rack, do not locate the unit in close proximity to a 
powerful amplifier, which may radiate a strong magnetic field from the power transformer. 

 

15.3 Earthing 

The 0V rail of the CX133 is coupled to the chassis ground by a parallel resistor/capacitor 
network and no interconnection problems should be encountered. When several mains 
powered units are connected together via their signal cables, there is a risk of one or more 
earth loops which may cause an audible hum on the system even with the gain controls set 
to minimum. The 'hum' can be remedied in several ways; the preferred method is to operate 
the output links to the power amplifiers in the balanced mode, with the cable screen only 
connected at the receiving end (amplifier input). The signal source units should be located as 
close as possible to the CX133 and the metal housing of the various units should not be 
electrically connected together through the equipment rack. If this is a problem, rack isolating 
kits are available from specialist hardware suppliers. If the problem persists, try to connect all 
the interconnected units, including the power amplifiers to a common power source to 
ensure that a common ground is provided. 
 

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15.4 Unbalanced 

Mode 

If the zone outputs are required to operate in the unbalanced mode, the unused pin of the 
XLR type connector should be left with no connection.  

 

16 Technical 

Specifications 

 

 

Stereo Line Input 

Frequency response 

20Hz-20kHz 

±

0.5dB 

Distortion <0.03% 

20Hz-20kHz 

Sensitivity 

-12dBu(200mV) to +8dBu(2.0V) 

Input impedance 

47k

 

Input gain 

±

10dB 

Headroom >20dB 
Noise 

-90dB (0dB gain) rms 22Hz – 22kHz 
HF 

±

10dB 10kHz 

Equalisation 

LF 

±

10dB 50Hz 

 
 Microphone 

Inputs 

Frequency response 

100hz -3dB(filter) 20kHz 

±

0.5dB 

Distortion <0.02% 

20Hz/20kHz 

Gain range 

0dB-60dB 

Input impedance 

>2k

 (balanced) 

Common mode rejection  

>70dB 1kHz 

Headroom >20dB 
Noise 

-128dB EIN 22Hz-22kHz (150

HF 

±

10dB 5kHz 

Equalisation 

LF 

±

10dB 100Hz 

 
 

Zone outputs & Utility output 

Nominal output level 

0dBu balanced 

Minimum load impedance 

600

 

Maximum output level 

+20dBu 

 
 

17 General 

Specifications 

 

Power consumption 

12VA 

Power requirements 

230V 

±

 10% or 115V 

±

 10% 

T50mA H for 230V input 

Fuse rating 

T100mA H for 115V input 

Fuse type 

20mm x 5mm 250V 

Width 482.60mm 
Height 44.00mm 
Depth 

160mm + connectors 

Weight 

3.50kg including packing 

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This product conforms to the following European EMC Standards

 

BS EN 55103-1:1997

 

BS EN 55103-2:1997

 

 

This product has been tested for use in commercial and light industrial environments.  If the equipment 
is used in controlled EMC environments, the urban outdoors, heavy industrial environments or close to 
railways, transmitters, overhead power lines etc. the performance of the unit may be degraded. 

 

The product conforms to the following European electrical safety standard. 

 

BS EN 60065:1998 

 

 

Safety Considerations and Information 

 

The unit must be earthed. Ensure that the mains power supply provides an effective earth 

connection using a three wire termination. 

 

When the mains switch is in the off position the live and neutral conductors of the mains 

transformer are disconnected. 

 

CAUTION – Installation 

 

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 35

o

 

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. 

Only reassemble the unit using bolts/screws identical to the original parts 

 

In the interest of continuing improvements Cloud Electronics Limited reserves the right to alter 

specifications without prior notice. 

 

Cloud Electronics Limited 140 Staniforth Road Sheffield S9 3HF England 

Telephone +44 (0) 114 244 7051 Fax +44 (0) 114 242 5462 E-mail: Info@cloud.co.uk