Cloud CX-A850 Installation & User Manual

CX-A850 Amplifier

Installation & User Guide

V 4.0

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

CX-A850:

Installation and Operation Manual 1

CX-A850 Amplifier

Installation and operation manual

Contents

1 Safety Notes ..............................................................................2

3 Installation..................................................................................2

4 Input Facilities............................................................................2

5 Input Routing Schematics..........................................................3

6 Output Details............................................................................4

7 100V Line operation...................................................................4

8 Bridged Mode Operation............................................................4

9 Status Indicators........................................................................5

10 Power Supply Capacity..............................................................5

11 VCA Modules.............................................................................5

12 VCA Module Installation.............................................................5

Section

2 General Description ...................................................................2

Page

13 Remote Level Plate Connections...............................................6

14 Speaker Equalisation Modules...................................................6

15 Equalisation Module Installation.................................................7

16 Field Servicing ...........................................................................7

17 General Specifications...............................................................7

18 Technical Specifications.............................................................8

08-03-05 V4

2

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 45oC

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 CX-A850 is an eight-channel power amplifier with a typical output of 50 watts per
channel into a 4Ω load. The unit features extremely low distortion and low noise together
with a high slew rate. Full circuit protection is provided and the load is disconnected if the
heat sink overheats or any DC is detected at the output. A five-second switch-on delay
operates to avoid any switching thumps or other extraneous signals reaching the speaker
system. The CX-A850 also has Dynamic Clipping Protection (DCP) that will automatically
reduce the signal level when the amplifier is driven into clipping thus limiting any clipping
distortion to a low level.

All eight input amplifiers are balanced and have 3-pin plug in screw terminal type input
connectors with adjacent level controls, all mounted on the rear panel. Input signal routing
switches are provided and allow the unit to operate in many configurations whilst retaining
simple input connections.

3 Installation

The CX-A850 is suitable for mounting in a standard 19" equipment rack and occupies two
units of rack space. Sufficient ventilation must be provided for the unit. The amplifier draws
cool air through the front panel and exhausts through the side panels and care must be
taken not to obstruct the airflow otherwise the unit may intermittently turn off due to the built­in thermal protection. The unit is 320mm deep but a depth of 400mm should be allowed to
clear the connectors.

4 Input Facilities

All eight inputs are balanced and use 3-pin plug-in screw terminal type connectors (3.5mm
pitch). All inputs have a level control adjacent to their respective connector. Rear panel
mounted switches provide input routing on channels 2 to 8 allowing a variety of
configurations.
In its default configuration, the unit operates as eight independent amplifiers. Four stereo
pairs, driven from one stereo source and eight channels driven from one mono source are
also possible by suitably configuring the input routing switches. Schematic diagrams of the
switching network in various configurations can be found on page 3.

CX-A850:

Installation and Operation Manual

08-03-05 V4