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Cloud 36 Installation & Operation Manual

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36/50 2 Zone Integrated 

Mixer Amplifier 

Installation & Operation Manual 

V5.0 

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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36/50:

 Installation and Operation Manual 

 

 

 

36/50 Integrated Two Zone Mixer Amplifier 

Installation and Operation manual 

 

Contents

 

 

 

Section

  

Page

 

 1 

Safety 

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

 

2 General 

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

 3 

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

 4 

Installation ..................................................................................3 

 5 

Music 

inputs ...............................................................................3 

 6 

Sensitivity 

Gain Control...........................................................3 

 

Music Control – Local or Remote ...............................................3 

 8 

Music 

Equalisation .....................................................................4 

 9 

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

 10 

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

 11 

Microphone 

Access Inputs .........................................................5 

 12 

Microphone 

Gain Control ...........................................................6 

 13 

Microphone 

Equalisation ............................................................6 

 14 

Microphone 

Level Controls.........................................................6 

 15 

Microphone 

Priority ....................................................................6 

 16 

Utility 

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

 17 

Speaker 

Output Details ..............................................................7 

 

18 

100V or 70V Line Operation.......................................................7 

 19 

Bose

 Speaker Equalisation Cards............................................7 

 

20 

Remote Music Mute – Fire Alarm Interface ................................8 

 

21 

Installing RSL-6 or RL-1 Remote Controls .................................8 

 

22 

Controlling two or more zones with one RSL-6 ........................10 

 

23 

Controlling two or more zones with one RL-1...........................10 

 

24 

Controlling the music functions using external DC control .......10 

 25 

Solving 

Problems .....................................................................10 

 26 

Default 

Jumper Settings ...........................................................11 

 27 

EMC 

Considerations ................................................................11 

 28 

Technical 

Specifications...........................................................12 

 29 

General 

Specifications .............................................................12

 

06/12/02 V5.0 

 


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2  

36/50:

 Installation and Operation Manual 

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 C. 

o

• 

Do not touch any part or terminal carrying the hazardous live symbol (    )  

  while power is supplied to the unit. 

• 

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 

The Cloud 36/50 is a versatile, multi-source two zone mono mixer with integrated power 
amplifiers. The 36/50 has one 50 watt power amplifier for each zone plus an additional 50 
watt ‘utility’ output. The unit has applications where one microphone and six line level music 
signals are required to feed up to three separate areas. A facility for connecting remote 
controls for the music source and level are provided.  For line distribution systems, optional 
four channel 100V/70V line transformer modules are available. 
The front panel controls are reduced to a minimum to reduce confusion; if preferred, the unit 
can be positioned in a protected area with just the remote music level and source controls 
positioned in the most appropriate location. All pre-set controls are on the rear panel.  A 
remote music mute facility is provided which may be used to satisfy the requirements of the 
Local Fire Officer. 

 

3 Schematic 

Diagram 

 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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36/50:

 Installation and Operation Manual 

 

 

4 Installation 

The Cloud 36/50 is suitable for mounting in a standard 19" equipment rack and occupies two 
units of rack space. Sufficient ventilation should be provided particularly where the unit is 
required to deliver a high output power for a long period of time. The cooling is provided by 
convection and the airflow through the ventilation slots must not be obstructed. In rack 
mounting applications we recommend that 1U of space is left both above and below the unit, 
though this may not be necessary if other equipment directly above and below the unit does 
not cover the ventilation slots. In free standing applications the feet supplied should be fitted, 
the unit stood on a flat surface and precautions should be taken to ensure that items will not 
be placed on top of the unit that may cover the ventilation slots. The 36/50 is 300mm deep 
but a depth of 375mm should be allowed to clear connectors. 

 

5 Music 

Inputs 

The 36/50 operates in mono but is fitted with six stereo line inputs, which are internally mixed 
to form mono signals. The line inputs are suitable for most music sources such as compact 
disc players, tape players and receivers etc. All the inputs are unbalanced and use RCA type 
phono sockets. The input impedance is 47k

 

Sensitivity & Gain Control 

All six line inputs have a pre-set gain control on the rear panel adjacent to the respective 
input sockets. The input sensitivity can be varied from -12dBu (195mV) to +8dBu (2.0V). The 
pre-set gain controls should be set so that all the input signals operate at the same level 
within the unit and the music level controls have an optimum range of control. For nominal 
operating levels the figure below gives a rough guide to settings for  
typical equipment, though as there is little in the way of standards       

Typical Gain Settings

 

for the output levels of CD players, tape players etc It is likely that 
some experimentation will be needed to find precisely the right 
levels. When setting the gain controls to achieve the maximum 
output level it should be noted that the unit has clip limiters on all the 
power amplifier sections. These clip limiters can give a false 
impression of the signal level, allowing the user to set the input gain 
controls to inappropriately high levels without noticeable clipping.  

 

Music Control - Local or Remote 

The music source and music level 
control functions can be controlled from 
either the front panel, or a remote 
control plate located up to 100m from 
the 36/50.  There are two remote 
control plates available for the 36/50 
the RSL-6 and the RL-1.  The RSL-6 
should be used when remote control of 
music source and music level is 
required whereas the RL-1 can be used 
when the application calls for remote 
control of the level only (source 
selection via front panel).  RSL-6 and 
RL-1 remote control plates can be 
mounted onto a standard British flush 
or surface mounted 25mm deep back 
box.  Two-core cable with overall 
screen should be used to connect the 
remote controls to the Cloud 36/50, the 
diagrams to the right show how to 
connect the two remote plates.  
See section 21 for installation details.  

06/12/02 V5.0 

 


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4  

36/50:

 Installation and Operation Manual 

The RSL-6A and RL-1A are available for the American market.  They have identical 
operation to the RSL-6 and RL-1 but have been designed to fit a single gang US electrical 
outlet box.  Front panel dimensions are 4 1/2”

×

2 3/4” 

 

8 Music 

Equalisation 

Separate treble and bass controls are provided for music signals on each zone. This 
arrangement allows the installer to optimise the response of the music signals on a zone by 
zone basis where different acoustic properties require optimal equalisation adjustment. The 
equalisation controls are on the rear panel. The music treble control (HF) has a range of 

±

10dB at 10kHz and the music bass control operates with a range of 

±

10dB at 50Hz. 

 

9 Priority

 

The Cloud 36/50 has a facility to allow fully automatic priority to a JukeBox or Spot 
Announce Player on both zones. Internal priority jumpers J12 (Zone1) and J13 (Zone2) can 
be repositioned to the ‘ON’ position to enable this in either or both zones.  Jumpers J12 and 
J13 can both be found located approximately 150mm behind the Zone 2 microphone level 
control 

Location of Jumpers J12 and J13 

 

When this priority mode of operation is selected, the zone will operate normally until a signal 
is detected on Line Input 6; this will cause the selected signal (usually background music) to 
mute, allowing the signal on Line 6 to operate with priority. Once the signal on Line 6 ceases, 
the selected music signal will smoothly restore to its former level; the time taken for this 
restoration can be set at 3, 6 or 12 seconds by fitting the appropriate jumper (J11) on the 
main printed circuit board. The factory default restoration time is 3 seconds. 

 

Location of Jumper J11

 

 

When setting the jumper(s) please ensure that you: 

• 

Remove the mains cable from the rear of the product before removing the top panel.

 

• 

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

 

06/12/02 V5.0

 

 


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36/50:

 Installation and Operation Manual 

 

 

10 

Microphone Input                                                       

Location of Jumper J1

 

A microphone input is provided, the microphone pre-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

 range. The input is via a 

gold plated 3-pin XLR type connector with latch and this is 
positioned on the rear panel. For a balanced microphone, 
connect the cable screen to pin 1, the in-phase signal (+) to 
pin 2 and the reverse phase signal  (-) to pin 3. 
For an unbalanced microphone, connect a wire link from pin 1 
(ground) to pin 3 inside the XLR cable mounted plug; use pin 
1 as ground (cable screen) and pin 2 as hot.  Phantom power 
is available by setting internal jumper J1 to the ‘ON’ position. 

 

When setting the jumper(s) please ensure that you: 

• 

Remove the mains cable from the rear of the product before removing the top panel.

 

• 

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

 

• 

Use a microphone that requires phantom power.

 

 

11 

Microphone Access Inputs 

The 36/50 has microphone access contacts to facilitate the connection of a paging 
microphone. Internal jumpers J2 (Zone 1), J3 (Zone 2) and J4 (Utility) should be removed if a 
paging microphone is to be used.   

 

Location of Jumpers J2, J3 and J4 

To enable a microphone in 
Zone 1, Zone 2 or the Utility 
Zone the appropriate rear panel 
mounted terminal/s (Z1, Z2, 
Utility) should be linked to the 
0V terminal. 

 

When setting internal jumper(s) 
please ensure that you: 

• 

Remove the mains cable from the rear of the product before removing the top panel.

 

• 

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

 

 

Wiring a CPM-4 to a 36/50

 

 

06/12/02 V5.0 

 


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6  

36/50:

 Installation and Operation Manual 

Multiple CPM paging microphones can be connected to a 36/50 when wired as the following 
diagram shows, each microphone will require an external power supply (CPM-PSU): - 

 

12 

Microphone 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. 

 

13 Microphone 

Equalisation 

Two band equalisation is provided for the microphone signal, these pre-set controls are 
positioned alongside the rear panel input connector and gain control. The characteristics of 
the equalisation are optimised for tonal correction of speech signals and the treble control 
(HF) provides 

±

10dB at 5kHz with the bass control (LF) 

±

10dB at 100Hz. 

 

14 

Microphone Level Controls 

Front panel controls for the Microphone level are provided for zones 1 and 2. The Utility 
microphone level is adjusted by means of a rear panel pre-set. Rotating any mic level control 
to the fully anti-clockwise position effectively turns the microphone off.  The microphone 
signals are routed directly to the output stage of the respective zone and mic signals are 
totally unaffected by the operation of the music controls – including the remote level controls. 
The mic 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. 

 

15 Microphone 

Priority 

Fully automatic, voice operated priority is provided. This priority is activated by means of a 
rear panel switch adjacent to the microphone tone controls. When a microphone is used, the 
music signals will attenuate by approximately 30dB; after the announcement, the music 
signals will restore smoothly to their former level. 

 

16 Utility 

Output

                                                

Location of Jumper J10

 

The 36/50 is fitted with a utility output, primarily 
intended to provide a signal for utility areas such as 
toilets and foyers.  The utility output has a limited 
choice of music sources, selected by a PCB mounted 
jumper J10 that consists of two movable links, jumper 
J10 can be found approximately 25mm behind the 
rear of the music mute connector.  The 36/50 leaves 
the factory configured to provide a music signal 
derived from the Zone 1 music source selector (pre-
level control) however, J10 can also be configured to 
set the utility music source to Line 1 input. Pre-set, 
rear panel controls are provided for the microphone 
and music levels. These controls do not function if 
jumper J10 has been set to it’s third option - the slave 

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36/50:

 Installation and Operation Manual 

 

 

position, in this case the music source, microphone and music levels track the Zone 1 
settings. 

 

When setting the jumper(s) please ensure that you: 

• 

Remove the mains cable from the rear of the product before removing the top panel.

 

• 

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

 

 

The Line 6 priority setting for the utility output also depends on the setting of the source 
select jumper J10: in the Line 1 position Line 6 priority is not available. In both the Zone 1 
source selection and Zone 1 Slave settings the Utility Line 6 priority is determined by the 
Zone 1 Line 6 priority setting.  If the microphone priority function is switched on, the music 
signals will attenuate when an announcement is made. 

 

17 Speaker 

Output 

Details 

Plug in, two pole, screw terminal connectors are provided on the rear panel for the three 
speaker outputs and these can accommodate flexible leads up to 2.5mm².  Do not make any 
connections to the unit with the power cable attached and please remember that it is good 
practice to distance the output wiring from the input wiring and keep speaker cables twisted 
until termination. 

 

18 

100V or 70V Line Operation 

A three-channel line transformer module – the CXL-3120 is available as an accessory. This 
gives the 36/50 up to three 100V or 70V, 40 watt outputs. This module is designed to fit 
inside the mixer chassis and may be configured for 70 or 100V operation by means of wire 
links on the PCB.  Unless specified otherwise, the module is pre-configured for 100V output. 
Each of the three output transformers on the module is connected to the main circuit board 
by their own individual input cable. If a transformer output is not in use its input cable should 
be disconnected from the main circuit board. When a transformer is in use the 65Hz high 
pass filter for that transformers zone must be activated by setting the appropriate jumper to 
the ‘ON’ position.  The jumpers are marked as follows: 

 

                                     Location of Jumpers J5, 8 & 9 (Inc Bose EQ Module Connectors) 
J5

 = Zone 1 

J8

 = Zone 2 

J9

 = Utility

 

 

 

If the filter is not switched 
on, high input levels at 
low frequencies may 
result in the transformer 
saturating and the 
amplifier’s VI limiter 
operating. 

 

When setting the jumper(s) please ensure that you: 

• 

Remove the mains cable from the rear of the product before removing the top panel.

 

• 

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

 

 

19 Bose  Speaker Equalisation Modules 

Two speaker equalisation cards are available for the 36/50: 

 

Model 8

 card for use with Bose

 model 8 speakers. 

Model 32

 card for use with Bose  model 25, 32 and 102 speakers. 

 

The internal Bose

 equalisation module connectors (see diagram above) are marked on the 

main PCB as: - 

CON2

 for Zone 1 

CON3

 for Zone 2 

CON4

 for the Utility Output 

 

06/12/02 V5.0 

 


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8  

36/50:

 Installation and Operation Manual 

To fit an EQ card: 

1.  Switch off at the mains supply and remove the power lead from the unit. 
2.  Remove the top panel from the unit. 
3.  Remove the jumper from the relevant PCB connector (see above for connector info). 
4.  Configure the relevant 65Hz jumper to the ‘ON’ position (see section 18 for details). 
5.  Take out the M3 screw next to the connector, this screw goes through the main PCB and 

has a white arrow pointing to it. Retain the screw. 

6.  Fit the M3 hex spacer where the screw used to fit. 
7.  Fit the EQ card to the connector making sure that the hole in the PCB lines up with the M3 

hex spacer. 

8.  Fit the M3 screw through the EQ module into the hex spacer. 
9.  Replace the top panel. 

 

20 

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 36/50 
provides a facility to mute the music signals only, by using a 
fully isolated pair of contacts.  This is usually a relay mounted 
close to the 36/50, which is powered by the fire alarm control 
panel.  The relay should close during an alarm condition (the 
installation of this relay is normally undertaken by the fire 
alarm installation company).  See right hand diagram. 

 

     

 

 

 

 

 

 

 

                                 

21 

Installing RSL-6 or RL-1 
Remote controls 

The remote control plates, RSL-6 and 
RL-1 are compatible with UK domestic 
electrical accessories and can be 
mounted onto a standard British flush or 
surface mounted 25mm deep back box. 
Two-core cable with overall screen 
should be used to connect the remote 
controls to the 36/50; because both 
functions are voltage controlled, a cable 
length of up to 100 metres can be used. 
When using a remote control plate, the 
‘music control’ switch should be in the 
‘remote’ position.  
If you propose to use an RL-1 remote 
level control, the PCB mounted jumper 
J6 (Zone 1) or J7 (Zone 2) should be in 
the ‘FR’ position to ensure front panel 
control of the music source.  The jumpers 
are located directly behind the 
‘local/remote’ switches. 

 

Location of Jumpers J6 and J7 

MUSIC CONTROL SWITCH SHOULD

BE SET TO THE 'REMOTE' POSITION

STANDARD WIRING CONVENTION

USE TWO CORE SCREENED CABLE

REMOTE CONTROL OF MUSIC SOURCE AND LEVEL

MUSIC CONTROL

REMOTE

(IN)

MIXER

3 POLE

CONNECTOR

RSL-6

1

2

3

1

2

3

FOR APPLICATIONS THAT REQUIRE
REMOTE CONTROL OF THE MUSIC
LEVEL WITH FRONT PANEL SOURCE
SELECTION

REMOVE POWER CABLE BEFORE MAKING ANY INTERNAL ADJUSTMENTS

PCB JUMPER SHOULD BE SET

TO THE 'FR' POSITION

SOURCE

SELECT
JUMPER

ATTENTION!

MUSIC CONTROL SWITCH SHOULD

BE SET IN THE 'REMOTE' POSITION

MUSIC CONTROL

REMOTE

(IN)

RL-1

REMOTE CONTROL OF MUSIC LEVEL (WITH FRONT PANEL SOURCE SELECTION)

MIXER

3 POLE

CONNECTOR

FR   SW

1

2

3

1

2

3

06/12/02 V5.0

 

 


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36/50:

 Installation and Operation Manual 

 

 

When setting the jumper(s) please ensure that you: 

• 

Remove the mains cable from the rear of the product before removing the top panel.

 

• 

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

 

 

22 

Controlling two zones with one RSL-6 

A single RSL-6 can be used to control more than one zone; however, the five resistors fitted 
to the RSL-6 will have to be replaced with different values. Where a single RSL-6 is used to 
control two zones, the resistors R1, R2, R3, R4 & R5 should be removed and replaced with 
the following values:

 

R1 

2k7 

2k 

R3 
R4 

1k1 

R5 

910R 

 

Where two zones are controlled by one remote plate, the level control will be loaded by the 
additional circuitry and will operate with a non-linear range; however, this has proved to be of 
little consequence operationally. 

 

A single RL-1 can be used to control the music level of more than one zone, however, the 
extra load can cause compression of the potentiometer law resulting in a non-linear control; 
this has proved to be of little consequence operationally. 

 

A Single RL-1 wired to Control Two Zones Simultaneously

 

 

24 

Controlling the music functions using external DC control. 

The 36/50 can be used as part of an automated sound system by controlling the music level 
and music source by an external 0-10V DC voltage. The 3-pole connector normally used to 
terminate the RSL-6 can be used to feed two separate control voltages into the unit. Pin 1 is 
a ground (0V) termination common to both control voltages; this should be connected to the 
technical ground (0V) of the voltage source. Pin 2 is the control voltage input for the music 
level and pin 3 is used to control the music signal source selection. 

R2 

1k3 

 

A Single RSL-6 wired to Control Two Zones Simultaneously 

23 

Controlling two zones with one RL-1 

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36/50:

 Installation and Operation Manual 

Level Control 

A maximum gain reduction of 60dB can be achieved with a control voltage of +10V; the rate 
of attenuation is approximately 165mV per dB. A control voltage of zero realises unity gain 
(full volume), however, with no external connection to pin 2, an internal 4k7 resistor 
connected to the +15V power will ‘pull up’ the control voltage to provide maximum 
attenuation. The output impedance of the control voltage source should be low enough to 
overcome the influence of this resistor. 

 

Source Select 

Line 1

  

+7.5V 

Line 2

  

+6.0V 

Line 4 

 +3.0V 

Line 5

  

+1.5V 

Line 6

  

0V 

With no external connection to pin 3, an internal 15k resistor connected to +15V will ‘pull up’ 
the source select control voltage and the ‘off’ position will be selected. The output impedance 
of the control voltage source should be low enough to overcome the influence of this resistor. 
If you would like to fix the music signal to a particular line input, wire a fixed resistor from the 
table below between pins 1 & 3 on the remote control connector: 

 

 

 

 

 Line 

 16k 

    Line 

 11k 

 

 

 

 Line 

 6k8 

 

 

 

 

Line 5

  

1k8 

 

 

 

 

Line 6 

 shorting 

link 

 

If the control voltage source is not isolated from the power earth, there is a small risk of 
creating a ‘ground loop’ by linking the mixer technical ground (0V) to the ground (0V) of the 
equipment providing the control voltages.  To minimise the risk, we suggest that all pieces of 
equipment be positioned in close proximity and supplied from the same power outlet. 

25 Solving 

problems 

 

25.1 

Ground loops (aka Earth loops) 

Here are the details of the music source select control voltages (pin 3) required to switch the 
six line input signals: 

Off

  

>+9.0V 

Line 3

  

+4.5V 

 

 

 

 

 

Line 4 

 3k9 

 

Despite your best efforts, if the completed sound system ‘hums’ you probably have a ‘ground 
loop’; the offending signal source can be found by setting the volume control to minimum 
then disconnecting 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 significant distance from the mixer. A good way of avoiding this 
potential problem is to use signal sources (CD players and the like) that are double insulated 
with no connection to the mains supply earth. If a signal feed were derived from a second 
mixer (a club or microphone mixer for example) it would be perfectly normal to expect this to 
be earthed; we suggest that a transformer be used to isolate the signal and prevent a noisy 
loop (See diagram on following page).  

 

25.2 

Connecting balanced signals to the unbalanced line inputs. 

We recommend the use of a transformer to convert a balanced signal to an unbalanced 
signal suitable for direct connection to the mixer line inputs. The transformer should be 
mounted close to the Zone Mixer and the unbalanced output lead should be kept as short as 
possible. Where both the source unit and destination mixer are earthed, it is important to 
isolate the primary and secondary windings to avoid a potential ground loop; if there is any 
doubt about this, we suggest that the balanced cable screen is not connected at the 
transformer end. Suitable transformers for this application are the RS Components 210-6447 

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36/50:

 Installation and Operation Manual 

 

11 

 

(primary & secondary series connected) and we recommend the fitting of the screening can 
(part number 210-6469); Canford Audio supply a similar transformer OEP Z1604 but we 
suggest that these should be fitted in a screened housing. All transformers should be wired 
to give a ratio of 1:1. 

 

Various Methods for Wiring a 1:1 Ratio Transformer 

 

 

26 Default 

Jumper 

Settings 

This section is intended as a quick reference for the experienced user, for more detailed 
information please consult the rest of the manual. 

 

Function  Default 

Setting 

J1 Phantom 

Power 

J2 

ON 
ON 

Bypass Utility mic access terminal 

J5 

Jumper 

OFF 

Bypass Zone 1 mic access terminal 

J3 

Bypass Zone 2 mic access terminal 

J4 

ON 

Zone 1 65Hz high pass filter 

OFF* 

J6 

Zone 1 source select (FR or SW) 

SW 

J7 

Zone 2 source select (FR or SW) 

SW 

J8 

Zone 2 65Hz high pass filter 

OFF* 

J9 

Utility 65Hz high pass filter 

OFF* 

J10 

Utility source select (Zone 1, Line 1 or Zone 1 slave) 

Zone 1 

J11 

Line 6 priority release time (3s, 6s or 12s) 

3s 

J12 

Zone 1 Line 6 priority 

OFF 

J13 

Zone 2 Line 6 priority 

OFF 

* Note that if the 36/50 is factory fitted with a 100V/70V line module CXL-3120, the default setting 

for jumpers J5, J8 and J9 is ON 

 

27 EMC 

Considerations 

The Cloud 36/50 fully conforms to the relevant electromagnetic compatibility (EMC) 
standards and is technically well behaved; you should experience no operational problems 
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 
communications transmitters, radar stations and the like, it is suggested that the microphone 
cable screen be connected to the shell of the XLR type connector and the line input leads be 
kept as short as possible. 

06/12/02 V5.0 

 


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12  

36/50:

 Installation and Operation Manual 

28 Technical 

Specifications 

 

 Line 

inputs 

Frequency Response 

20Hz-20kHz 

±

0.5dB 

Distortion 

<0.05% 20Hz -20kHz 

Sensitivity 

195mV (-12dBu) to 2.0V (+8dBu) 

Input Gain Control 

20dB range 

Input Impedance 

47k

 

Headroom >20dB 
Noise 

-90dB A weighted (0dB gain) 

Equalisation 

HF: 

±

10dB/10kHz    LF: 

±

10dB/50Hz 

 

 Microphone 

Inputs 

Frequency Response 

100Hz / -3dB(filter)   20kHz 

±

0.5dB 

Distortion <0.05% 

20Hz-20kHz 

Gain Range 

0dB-60dB 

Input Impedance 

>2k

 (balanced) 

Common mode rejection 

>70dB 1kHz 

Headroom >20dB 
Noise 

-126dB EIN 22Hz-22kHz (150

Equalisation 

HF: 

±

10dB/5kHz    LF: 

±

10dB/100Hz 

 

 Outputs 

Low Impedance Outputs – 4 Ohm Load/s 

1ch driven 60 watts, 2ch driven 52watts, 
3ch driven 45watts 

Low Impedance Outputs – 8 Ohm Load/s 

1ch driven 37 watts, 2ch driven 34watts, 
3ch driven 30watts 

100V Line Output 

100 volts balanced – 250

 min load 

(optional module) 

70V Line Output 

70 volts balanced – 125

 min load 

(optional module) 

Protection 

VI Limiting, DC Offset, Thermal & switch-
on delay 

Cooling Convection 

 

29 General 

Specifications 

 

Power input 

230V 

±

5% (115V 

±

5% available) 

Fuse rating 

230V – T3.15A H       115V – T6.3A H 

Fuse type 

20mm x 5mm 250V 

Dimensions 

482.60mm x 88.00mm(2U) x 300.00mm deep (+ con) 

Weight 36/50 

6.70kg net 

 
 

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 

 
 
 
 
 
 
 

06/12/02 V5.0

 

 


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36/50:

 Installation and Operation Manual 

 

13 

 

06/12/02 V5.0 

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 ‘O’ 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

C. 

 

CAUTION – Hazardous Live 

 

Do not touch any part or terminal carrying the hazardous live symb

while power is 

supplied to the unit. 

 Terminals to which the hazardous live symbol refers require 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.  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. 

 

Bose

 is a Registered Trademark of The Bose Corporation. 

 

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 

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