Cloud Electronics 44-50 User Manual

44/50 4 Zone Integrated

Mixer Amplifier

Installation & Operation Manual

Cloud Electronics Limited

140 Staniforth Road, Sheffield, S9 3HF England

Tel + 44 (0) 114 244 7051

Fax + 44 (0) 114 242 5462

E-mail

Web site ht tp://www.cloud.co.uk

[e-mail]

44/50: Installation and Operation Manual 1

44/50 Integrated Four Zone Mixer Amplifier

Installation and Operation manual

Contents

Section Page

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............................................................................. 3

9 Line 4 priority..................................................................................... 4

10 Microphone inputs ............................................................................. 4

11 Paging microphone............................................................................ 4

12 Connecting Multiple CPM-4s to the 44/50..........................................4

13 Microphone gain control..................................................................... 5

14 Microphone equalisation.................................................................... 5

15 High pass filter................................................................................... 6

16 Microphone level controls.................................................................. 6

1 Safety notes....................................................................................... 2

17 Microphone priority ............................................................................ 6

18 Auxiliary outputs ................................................................................ 6

19 Output details..................................................................................... 6

20 100V or 70V line operation................................................................. 6

21 Remote music mute – fire alarm interface.......................................... 7

22 Fitting and configuring the REM-4 remote control module.................. 7

23 Special notes regarding the use of the REM-4................................... 7

24 Music signal processing PCB............................................................. 8

25 Installing RSL-1 or RL-1 remote controls........................................... 8

26 Controlling two or more zones with one RL-1..................................... 8

27 Controlling two or more zones with one RSL-1.................................. 9

28 Front panel music level control defeat................................................ 9

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

30 EMC considerations......................................................................... 10

31 Technical specifications................................................................... 11

32 General specifications...................................................................... 11

2 44/50: Installation and Operation Manual

1 Safety Notes

The Cloud 44/50 contains several PCB mounted jumpers which can be set to pr ovide the
desired configuration for a specific application; these adjustments should be performed by
a technically qualified person who fully understands the hazards associated with mains
operated equipment. Do not rem ove the t op panel unless you are qualified to do so.

Remove the power cable from the unit befor e r emoving the top panel and do not make
any adjustments with the unit switched on.

The Cloud 44/50 is supplied with a power cable fitted with a moulded plug; if the plug is
cut off the lead for any reason, remember that the discar ded plug is a potential hazard
and should be disposed of in a responsible manner.

2 General

The Cloud 44/50 is a versatile, multi-source four zone mono mixer with four 50 watt
power amplifiers. The unit has applications where two microphone and four line level
music signals are required to feed four separate areas in any combination. O ptional
accessories extend the flexibility of the unit: A dedicated four zone paging mic with pre­announcement chime is available, a plug-in remote cont r ol PCB provides remote control
of music level and source and for line distribut ion system s, a four channel 100V/70V line
transformer module is also available.

The front panel controls are r educed to a minimum to reduce confusion; if preferred, the
unit can be positioned in a protected area with just the rem ot e m usic level and source
controls positioned in the most appropriate location. All pre-set controls are either on the
rear panel or protected by covers.

A remote music mute facilit y is provided which may be used to satisfy the req uir ements of
the Local Fire Officer.

3 Schematic Diagram

44/50: Installation and Operation Manual 3

4 Installation

The Cloud 44/50 is suitable for mount ing in a standard 19" equipment rack and occupies
two units of rack space. Suf ficient ventilation should be provided particularly where it is
required to deliver a high output power for long periods of time; t he unit draws cool air
through the front panel and exhausts through the rear panel. The 44/ 50 is 300m m deep
but a depth of 375mm should be allowed to clear connectors.

5 Music Inputs

The 44/50 operates in mono but is f it t ed with four stereo line inputs, which are internally
mixed to form a mono signal. T he line input s 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 four line inputs have a pre-set gain control on the rear panel adjacent to the respect ive
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 44/50 and the music level controls have an optimum range of cont rol.

7 Music Control - Local or Remote

The music source and music level control functions can be operat ed from the front panel,
or remotely when the optional REM-4 plug-in four channel rem ote control module is fitted
and wired to a maximum of four RSL-1 contr ol plates. This plate can be positioned up to
100 metres from the 44/ 50 and 2- cor e cable with overall screen should be used. Self­adhesive labels are provided to identify the signal source on both the 44/ 50 front panel
and the RSL-1. The front panel m ounted music level controls can be defeated if r equired,
please refer to section 27 f or full details. If preferred, the music source can be controlled
from the 44/50 f r ont panel with the music level only controlled remotely using the RL-1
remote level control. See section 21 for REM-4 f it t ing instructions and section 24 for
remote level plate installation requirements.

8 Music Equalisation

Separate treble and bass controls are provided for m usic signals only on each of the four
zones. 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. T he equalisation controls are concealed behind the removable
control panel secured to the front panel. Using the supplied Allen key, remove the f our
Allen cap screws which retain the control panel; the HF and LF equalisation controls ar e
clearly marked and located below the music controls fo r t he r e levant zone. A flat
frequency response can be achieved by positioning the slot on the contr o l shaft in the
horizontal plane. The music treble control (HF) has a r ange of ±10dB at 10kHz and the
music bass control operates with a range of ±10dB at 50Hz.