Cloud CXV225NA, CXV425NA User Manual

CXV225NA & CXV425NA

AMPLIFIERS

0

1

0

1

1

CXV425

4 CHANNEL 70V LINE AMPLIFIER

PROTECT

PEAK

SIGNAL

3

POWER

2

4

CXV225

500W STEREO 70V LINE AMPLIFIER

PROTECT

PEAK

SIGNAL

POWER

2

1

Installation and User Guide

Contents

Safety Information ........................................ 4

Safety Notes Regarding Installation ....................... 4

Conformities ............................................................... 4

Safety Considerations and Information ................4

General Description ...................................... 5

Applicable Models ......................................................5

Schematic Diagram ...................................... 5

Front Panel Description ............................... 6

Rear Panel Description ................................. 7

Installation ..................................................... 8

Mechanical ................................................................... 8

Ventilation .................................................................... 8

Connections and Adjustments ................................ 8

Inputs ............................................................................ 8

Sensitivity and Gain Control ................................ 8

Input Routing ........................................................... 8

Remote Control of Level ...................................... 9

Outputs ........................................................................ 9

Protection...............................................................10

High Pass Filters ....................................................10

VCA Cards (optional) ............................................. 10

Installation .............................................................10

Loudspeaker Equalisation Modules (optional) ..11

Installation ..............................................................11

General Notes ............................................. 11

EMC Considerations ...............................................11

Earthing ......................................................................11

Technical Specications .............................. 12

General Specications ................................ 12

Location of Internal Jumpers and

Connectors. .................................................. 13

CXV225NA connector and jumper details .......13

CXV425NA connector and jumper details .......14

CXV225NA & CXV425NA User Manual v1.0 3

Safety Information

Safety Notes Regarding Installation

• Do not expose the unit to water or moisture.

• Do not expose the unit to naked ames.

• Do not block or restrict any air vent.

• Do not operate the unit in ambient temperatures above

35°C.

• 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 qualied to do so and fully understand the hazards

associated with mains-operated equipment.

• The unit has no user-serviceable parts. Refer servicing

to qualied service personnel.

Safety Considerations and Information

The unit must be earthed. Ensure that the mains power
supply provides an effective earth connection using a three­wire termination.

When the mains switch is in the off ‘O’ position the live
and neutral conductors of the mains transformer are
disconnected.

Caution - High Voltages

Do not touch any part or terminal carrying the hazardous
live symbol ( ) while power is supplied to the unit.

Terminals to which the hazardous live symbol refers require

installation by a qualied 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 20 mm x 5 mm.

• If the moulded plug is cut off the AC power lead for

any reason, the discarded plug is a potential hazard and
should be disposed of in a responsible manner.

Conformities

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 unit 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 60065:2002

Caution - Servicing

The unit contains no user-serviceable parts. Refer servicing

to qualied service personnel. Do not perform servicing
unless you are qualied 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.

The CXV Series was developed and manufactured with high
quality materials and components, which can be recycled
and/or reused.

CXV225NA & CXV425NA User Manual v1.04

General Description

The Cloud CXV225NA and CXV425NA are high power

(250 W/ch), multi-channel audio ampliers intended for use
with high quality PA and background music systems in ofces,

hotels, factories, leisure facilities and other commercial and
industrial premises.

They are designed to drive 70 V-line speaker systems directly,
and have no low-impedance outputs. Low impedance

loudspeakers can only be connected to these ampliers

with the use of an intermediate 70 V-line transformer.
Loudspeakers designed for such ‘installed-sound’ applications
will normally include an integral transformer, typically with
selectable output power taps. If you have any doubt about

the suitability of this amplier for the speaker system it is to

be connected to, please verify that the speakers are of the
70 V-line type with the manufacturer.

Unlike traditional 70 V-line amplier designs, the CXV225NA

and CXV425NA do not employ an output transformer. This

produces a considerable saving in weight and a signicant

improvement in audio quality.

Applicable Models

This manual describes the installation and operation of the
following models:

• Cloud CXV225NA 2-channel amplier –

2 x 250 W, 2U 19” rack unit

• Cloud CXV425NA 4-channel amplier –

4 x 250 W, 3U 19” rack unit

Apart from the number of channels and the units’ physical

dimensions and power consumption gures, the two

models are otherwise identical for the practical purposes of
installation and operation.

Schematic Diagram

CXV225NA

+

3

2

-

1

+

3

2

-

1

+

3

2

-

1

+

3

2

-

1

CXV425NA

fig.1: CXV Series schematic diagram

LEVEL

LEVEL

LEVEL

LEVEL

VCA

VCA

VCA

VCA

FREQ

FREQ

FREQ

FREQ

J1

SPEAKER

EQ

J2

SPEAKER

EQ

J3

SPEAKER

EQ

J4

SPEAKER

EQ

CLIP

LIMITER

CLIP

LIMITER

CLIP

LIMITER

CLIP

LIMITER

PROTECT

POWER

AMPLIFIER

PROTECT

POWER

AMPLIFIER

PROTECT

POWER

AMPLIFIER

PROTECT

POWER

AMPLIFIER

7

OUTPUTS

CHANNEL.

1

2

3

4

5

6

7

8

CXV225NA & CXV425NA User Manual v1.0 5