Cloud 36, 50, 36/50 Installation & Operation Manual

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

[e-mail]

Web site http://www.cloud.co.uk

36/50: Installation and Operation Manual 1

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

7 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

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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 3

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 47kΩ.

6 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.

7 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.

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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.

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