Cloud Electronics MPA626 User Manual

MPA-626

Installation & Operation

Manual

V5.0

Cloud Electronics Limited

140 Staniforth Road, Sheffield, S9 3HF England

Tel [phone]

Fax [phone]

E-mail [e-mail]

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

MPA-626: Installation and Operation Manual 1

MPA-626

Installation and operation manual

Contents

1
2
3
4

4.1 Sensitivity & Gain Control.................................................... 4

4.2 Music Source Select............................................................ 4

4.3 Music Level Control, Local or Remote................................. 4

5
6
7

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

7.2 Microphone Input................................................................. 6

7.3 Restoration Relays .............................................................. 7

8
9

Section

Safety Notes
General Description
Schematic Diagram
Music Inputs

Music Equalisation
Music Priority
Microphone Input

Front Panel Level Controls
Microphone Equalisation

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Page

10

11

12

13

14

14.1 Installation Information..................................................... 10

14.2 Installation Instructions.................................................... 10

15

15.3 Connecting Multiple DM-1 Modules to the Facility Input.. 13
16
17

General Notes

Microphone Priority

10.1 Microphone Over Music Priority......................................... 8

10.2 Mic 1 Over Mic 2 Priority................................................... 8

Chime
Power Amplifier and Line Outputs

12.1 Power Amplifier and Protection Circuits............................. 9

12.2 High Pass Filter ................................................................ 9

12.3 Aux Outputs...................................................................... 9

Music Mute (Fire Alarm Interface)

Bose Equalisation Modules

Facility Input

15.1 AE-1 Facility Connection ................................................. 11

15.2 DM-1 Facility Connection................................................. 12

Facility Input Capacity

........................................................................................ 9

.......................................................................... 10

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................................................................. 8

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17.1 Multi-zone Applications.................................................... 14

17.2 EMC Considerations........................................................ 14

2 MPA-626: Installation and Operation Manual

17.3 Earthing............................................................................15

17.4 Ventilation.........................................................................15

18
19
20

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Technical Specifications
General Specifications
Factory Default Jumper Settings

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...........................................................16

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MPA-626: Installation and Operation Manual 3

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

• 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.

o

C.

2 General Description

The Cloud MPA-626 is mixer-amplifier with applications in Licensed, Retail and Leisure venues.
The unit has inputs for six stereo line signals and two microphone signals. Front panel controls
are provided for music source selection, music level and microphone levels. All pre-set controls
are located on the rear panel with additional configuration jumpers mounted on the printed
circuit board. A remote level control can be wired to the unit for applications that require remote
control of the music level.

3 Schematic diagram

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4 MPA-626: Installation and Operation Manual

4 Music Inputs

The unit has six stereo line inputs that are mixed internally to mono; these inputs 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 47kΩ. The Line
6 input can be configured to have priority over any other music source, see section 6.

4.1 Sensitivity & Gain Control

All six 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.

4.2 Music Source Select

This front panel six 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 6 input can be configured to
have priority over any other selected signal, see section 6 for full details.

4.3 Music Level Control, Local or Remote

A front panel mounted music level control is provided. Remote control of the music level is
possible by connecting a remote level control plate (RL-1) to the 3 pole connector on the rear
panel of the MPA-626 see the diagram below.

Setting internal jumper J12 to the disable position will disable the front panel level control, see
the diagram below for jumper location. A front panel LED adjacent to the level control will
illuminate to indicate that the control is bypassed. Use two core screened cable to connect the
remote level plate (max length 100 metres).

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MPA-626: Installation and Operation Manual 5

5 Music Equalisation

One set of independent bass and treble controls is provided for the music signals. These pre­set controls are located on the rear panel adjacent to the line input sockets. The treble control
has a range of ±10dB at 10kHz and the bass control has a range of ±10dB at 50Hz.

6 Music Priority

When a Juke Box or Spot Announce Player is connected to the MPA-626, fully automatic
priority over any selected line input can be achieved by using the Line 6 input and setting the
rear panel switch L6/PR to ON. When this mode of operation is selected, the unit will operate
normally until a signal is detected on line 6, this causes 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 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 repositioning jumper J13 on
the upper rear printed circuit board.

7 Microphone Inputs

Two microphone inputs are provided, the microphone amplifiers are an electronically balanced,
transformer-less design configured for optimum low noise performance. The input impedance is
greater than 2kΩ and is suitable for microphones in the 200Ω to 600Ω range. Inputs are via gold
plated 3-pin XLR type latching connectors, which are 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), see diagram below: -

Phantom power facilities are provided; either of the inputs can be configured to operate with
15V phantom power by setting the relevant jumper to the ON position. Jumper details and
locations are shown in the following diagram : -

Care should be taken to ensure that phantom power is activated only when the microphone
connected to the input requires external phantom power

7.1 Gain Control

A pre-set gain control is provided adjacent to the XLR input connector. The gain can be
adjusted from 20dB to 60dB. A high overload margin is maintained at all gain settings

7.2 Microphone Access Inputs

The microphone access inputs are primarily intended to provide compatibility with paging
microphones and their associated switching arrangements. When these inputs are left open
circuit the microphone inputs are muted. When either terminal 1 or 2 is connected to the 0v
terminal the respective microphone channel will become open for use.

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