Australian monitor CONTRACTOR, OPAL User Manual

Australian

Monitor

PROFESSIONAL AUDIO

CONTRACTOR

and

opof

Audio

Amplifiers

POWER AMPLIFIERS

OPERATION MANUAL

IMPORTANT!

The rear

inlemationally

and

MAINS

The head triangle

uninsulated voltages

These voltages constitute This

panel

of the unit has a number

recognized symbols

precautions

connected

presence

contained within

that

of a LIGHTNING

is intended

may be of

the risk

symbol is

of an electrical

reinforced

This

information

performance,

power

with the

your

Safety

related to the hazards

should be taken when

equipment.

FLASH with

the boundaries

to alert

may

the user that

exist within

a sufficient magnitude

with the text:

the units

shock.

Please

Operation

amplifier.

contents

amplilier.

read

Manual

regarding

maintenance

You

should

of this manual

carefully.

contains

safety

and

Precautions

of markings

of a

and

operating

an arrow-

equilateral

dangerous

enclosure.

as to

The

qualified

intemal servicing

important

precautions,

operation

familiarize

before operating

and

your

of

yourself

Labelling

REFER

SERVICING

QUALIFIED PERSONNEL

user should not

and

knowledgeable

wo.kings

or

authorized modification

attempt

of the unit

to service

personnel

should

TO

ONLY

the

familiar

attempt

to the

unit. Only

with

any repair,

unit.

the

ICAUTION!

RrsK

The

within

to alert the

mainlenance

DO

The

encounterlhe entry

the unit to the above

of the unit hazardous

shock.

oF ELEcTRTcAL

Do Nor

presence

the boundaries

of an EXCLAMATION

user thal there

literature

IWARNING!

NOT EXPOSE

RAIN

unitshould not

OR MOISTURE

beoperated in

ofwater, rain,

sHocK

oPEN

of a

equilateral triangle is

is important

that accompanies

TO

EITHER

a situation

or anyfluids.

conditions may

and increase

/lt\

,/ t \

MARK

operating

the unit.

where it may

To expose

make

the operation

the

risk of electrical

contained

intended

and

NO USER

The unit service or re-use in

you

lf

are in

you

tion

please Monitor direct:

contact

SERVICEABLE

does not

require is

AUSTRALIAN

ERMINGTON.

contain

need of special

your

THE

TECHNICAL

AUSTRALIA.

Local (02)

lntemational (612)

PARTS

parts

any

this

or any other

assistance

outside

nearest

29 HOPE

the scope

service

OFFICER

I\,4ONITOR

SYDNEY. N.S.W.

Pry

ST

21 15

Phone

874 9355 (02)

874

9355

(612)

INSIDE

which

product.

and

the user

the

can

informa-

of this manual,

agent or Australian

LTD,

Fax

874 9366

874

9366

/tu

Contents

1. lntroduction

2.

Controls, Connectors

&

3. lnstallation

4. Operation

5. Bridge Mode

6. Load lmpedance

7.

Maintenance

8. Warranty

9. Specifications

Features:

-

Custom designed, heavy

-

Open modular

-

Symmetrical weight

-

Well-regulated,

-

High VA-capable

-

Binding

-

Stereo

-

lnput

-

21 Position

post

or bridged / mono operation.

signal XLR

construction,

distribution

high

current

toroidal

output connection

and tag strip connector

detented attenuators.

+

lndicators

duty alloy chassis. -

for

ease

of servicing.

power

mains

supply.

transformer.

5

q

12 14 15 16 17

18

List

Figure Figure 2. Front Panel Figure Figure Figure

-

- Plug

-

of Illustrations

1 .

Block Diagram

3. Rear Panel

'Speakon'

4.

5. Bridge Mode

1 Watt

Output clip indication Massive heafsink

Efficient front Single speed Output fault indication.

High-quality,

output indication.

in signal

throughout.

and heat-exchangers.

to back cooling.

automatic axial fans.

processors

close{olerance

Layouts

Connector WirinS

Speaker Wiring

-'l

at

dB

(optional).

components

.l

14

4

a

1

Protection

-

Suppression of inrush

-

lnput

muting

-

lnput

overvoltage

Features

cunent at mains turn-on.

at turn-on. -

protection.

-Radio-frequencyinterferencesuppression.

- Short-circuit

Australian

protection

Monitor

and indication.

-

lndependent

Layout,

have been

DC

grounding,

optimized to

supply rail fuses.

decoupling

provide

stability,reliabilityandlongevity.

and componentry

the user with

ltu

l.Introduction

Congratulations

professional

The

design

aspects

chanical,

dedicated

optimized quality,

Figure channel inputwith

amplification

ofyouraudio

of

a well designed

electrical

manufacturing processes,

to

reliability

1

shows

of the

a

buffered

on

choosing

and sonic

provide

and

a block

amplifer

attenuator

Australia n

requirements.

poweramplifierembraces

unit. The visual

parameters,

Monitorlot your

along with

have

professional

a

longevity.

diagram

comprises

PRE,AMP

AGE

ST

driving

tool

of the

amplifier.

a balanced

a differentialclass

INSERT

POINT

all

the

design,

me-

our

all been

that exhibits

Each

active

BUFFER

S

TAGE

A

drive

stage which

MOSFET

The

unit operates

power

supply.

The

Contractor,

in 19'

wide rack

These

units

their high

vide

the

critical

ers, at high

DRIVER

AGE

ST

output

Opal

have been

power

degree

duty

in

turn

stage

configured

from

a high

pA

and

mountable

specifically

output with

ofcontrol

cycles for

OUTPUT

STAGE

,I

drives

a fan-cooled,

as

a source

current-capable

Series

are

2 units

cases.

designed

minimal

exlended periods.

distortion,

required

by

class

follower.

tall

to deliver

and

your

OUTPUT

AB,

linear

(3.5"),

pro_

speak-

CHA

o/P

CHB

O/P

Figure

/tu

1 Amplifier

Block

Diagram

2.

Controls,

Connectors

Models and Variants

Indicators

&

While these amplifiers are designed to

applications, all variants use the same

output

powers

= = = =

2x 2x

2x 2 x

are:

175W

300w

400w

600w

The

Contrac'tor Series :

C300 C600

C800

C1200

electronics.

4 4 ohms

fu,Austanan

Contractor Series

suit different

ohms

Monitor

Opal Series :

1202

Opal

Opal 2802

PA Series:

PA-3 PA-6

PA-8

PA-12=

= = =

c600

= =

-o,g

ol:lr

2x 2x

2x

2x 2x 2x

'175W

300W 4 ohms

175W

300W 4 400W 4

4

ohms

4 ohms

ohms ohms

600W 4 ohms

\-:-:

N

Opal Series

Aushalian

Monitor

OD

Figure

2 Front Panel

Layouts

/tu

6

Controls

& Connectors

Front

Figure numbers

the

l.

This

exists.

The

between

A

rail

programme. peaks less.

The

Panel

2 shows

refer

controls

Faultlndicator

amber

fault

short

on the

fuse

the LED

forgross

circuit has

lt will

provide

1.

does not

2.

lt will

shorted

2.

Attenuator

Level

control for

position reduction mum

detented

gain,

3. Power

Press

the

the switch

(turn-on) for

the input

approximately

layouts

lo

areas

and indicalors

of

on the drawing.

LED will

detection

drive

This

affect

indicate

output).

in

decibels

no

circuit monitors

and output

speaker

will flash

LED

overloads;

two

stages

indication

the input

and mute

your

potentiometer

from

attenuation).

Switch

switch

to the

to the right

left for

to

the amplifier

two

the front

are as

panels;

follows:

flash when

your

of

output or

brightly

willalso flash

if

or

the load

of operation:

gross

(e.g

signal_

the input

amplifier

seconds.

is

and indicates gain

'0

the

dB'

for

power

The

a fault

the

amplifier.

a blown

in sync

programme

with

is 2

overload)

provided

position

power

OFF.

is

muted by

the

section

functions

condition

difference

negative

with

the

ohms

but

ON.

by a

(maxi-

press

(e.g

21

signal

At start-up

30dB

or

of

fans

will

continue

had a

cooFdown

matically input

5.

Status Indicator

This is

of

the

operation.

The

exceeds 2.828

4

ohms).

The

the

er's output

providing

muting.

a dual

output

These

Below 1 watt

1 watt

and

1dB

below

LED will

-1dB point

stage.

with reference

alter

with

changes in

the load,

The attack

and duty

and

circuitarethoseof

lf

using this

steady watt level ohms,

The

amplilier

ping,

your

of

indicator

tone

is

the

(or

2 wafts for

butyourspeakers

speakers,

to period

colour

stage

levels

above

actual

turn

volts

change

before

The

to the

cycle

delay

Peak

a

(e.g

slate

point

is not

try

run

and

the

inrush

LED

and

cunent

which

displays

are:

ctipping

green

once

(1

watt

to red

once

actual

threshold

amplifier

the

mains

fluctuations.

time

Programme

to line

on a mixing

when

indicator

4 ohm

damaged

may

to keep

once

the

unit

will restart,

suppression

displays

three

(unlit)

(green) (red)

the

output voltage

re

8 ohms,

the

output

clipping

(ballistics)

up

sensitivities,

loads).

by

be.

clipping

of the

supply rails

supply,

Meter(p.p.M.)

console).

comes

running

To maximisethe

infrequent.

amplifier has

auto-

and

the

status

tevels

or 2

watts re

exceeds

amplifi-

-1dB

point

and

will

changes

of

the status

apply a

The

on, re

into

clip-

life

of

is

in

1

g

4.

On/Thermal

This

is

green

receiving

ln the

advent

red

indicating

ture

of the

operation

/tu

Indicator

a dual

and indicates

colored

mains

of a thermal

that the

amplifier

and

that the

power.

LED which

that

the amplifier

overload

internal

has

exceeded

amplifier

will normally

this LED will

operating

a safe level

has

shut down. The

is

on and

tum

tempera-

be

of

Rear Panel

Controls

& Connectors

7

Figure

numberc refer to areas on the drawing. the controls

3 shows

and

layouts

indicators

of the rear

are as follows:

panels;

6. Balanced Input

A female

Pin 1=Signal

Pin Pin

6b Level

(Contractor

A rear

potentiometer

for

6c Barrier

A three terminal

3

2 = Cold

3

Hot

=

Control

panel

input

level

XLR connector is

Ground

(inverting

(non-inverting

version

mounted

provided

is

control on

Strip

Input

barrier strip connector is

for'hard wiring'signal input

tions. This input

7.

Signal

(C800 When ground

It is

to

different

ment

up on the input interrupt connector).

Ground Lift

& C1200 only)

this

switch

from

intended to

ground potentials

the

and

signal

The amplifier should be

before engaging

Hum Problemsintormation

of this manual-

parallel

is

engaged

the input

amplifier), or stray magnetic field

connectors on both channels.

be used to

ground/shield

ground

this switch! Please read

provided

or reverse

phase)

in

or

only)

position

21

on all Contractor models

each

channel.

in

with the input

Switch

it

disconnects

isolate

between

wiring. (lt

continuity on the

in the Operatlon

the

The functions

on each input:

phase)

detented

provided

permanent

XLR.

earth loops

source

does not

strapping

turned off

section

situa-

signal

(due

equip-

pick

the

section

Mains

9.

of

Your

(power

ply

fier. The

accordance with

Your Note: 110V version

mains Iead.

10. Mains Fuses

M

fiers. Fuses need and the value must

I l.

Pushing

mode

only accept signal applied

and the level channel A's

will automatically

versed

sourced

rcad lhe Bridge Mode

Lead

amplifier is

cord) appropriately

voltage

wires

BROWN BLUE

GREEN&YELLOW

unit must always

fast

205

Connector

supplied with

marked

in the mains

the following

= =

blow

type fuses are

to be replaced

I.E.C.

a IEC mains lead

rated

for the mains

on the rear

ACTIVE

NEUTRAL

are

be as follows:

panel

lead are coloured in

code:

EARTH

=

be earthed!

supplied with heavy

used in these ampli-

with the

C300/Opal1202lPA3

C600/Opal2802/PAO

c800

c1200tPA8tPA12

Bridge

Switch

this switch in

of operation. ln this mode

of both channels will be

attenuator. The

phase)

from

the red

engages the BRIDGED/MONO

to channel A's input XLRs

output

be of the opposite

and speaker

binding-post outputs. Please

termination should be

section of this manual.

of

34 64

7A

10A

your

amplilier will

controlled by

from

polarity

sup-

your

ampli-

duty

same type

channel B

(re-

Binding

8.

Binding speaker

spade

as

positive

Post

posts

(banana

output termination

type lugs or bare wire. The red

and the black

Australian Monitor

Outputs

jacks)

post

provided

are

post

plugs,

is used

with

banana

is used as negative.

for

CHA CHB

+VE

-

VE

Phase Phase

/tu

8

Controls & Connectors

&

.d*I

Opal & PA Series

.Outp!t

,ffi

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Figure

/tu

Rear Panel

3

Layouts

3. Installation

Mains Lead Wiring

WARNING

Your

amplifier must be

you

When mains

plug

ate current

your

The

with the

plug

is used. It

(ampere)

local

energy

wires in

following

first receive

attached. You

requirements,

authority.

the mains lead

code:

GREEN&YELLOW=EARTH

Connect to the with the EARTH

BLUE = NEUTRAL

Conneci

(or

or coloured

BROWN

Connect to the terminal (or

or coloured

Power

Ensure that

panel

rear consumption is

110-120 Volt

to the terminal

colored WHITE

BLACK in the

ACTIVE

=

colored BLACK

RED in

Requirements

your

mains supply voltage

mains voltage

as follows:

Models

C300/Opal1202lPA3 C600/Opal2802/PA6 c800/PA8 c1200tPA12

earthed at all

your

amplifier it

must ensure

must correspond

are coloured

terminal marked with

SYMBOL,

marked with

in USA

(LIVE)

marked with

in USA

the United Kingdom).

marker. Each model's

Amps Watts

15 100 15

?0 160 2200

timesl

may not have

that

an appropri-

with the

and meet

the approval

in accordance

the letter

or coloured

the letter N,

and Canada,

United Kingdom).

the letterA

and Canada,

is the

same as the

at idle

6

50 450

120 1400

amplifier's

GREEN.

or L.

power

Watts

power

full

1000

E.

Mounting

Your

amplifier is designed

ing,

and occupies

centers

a

Vertical:

Horizontal: 18.2'to

of

The

slots in the mounting

up to 1/4"

We recommend

the amolifier,

amplifier's weight

provided

be

panel

2 EIA rack units

are:

3.0'(76.2mm)

(6.35mm).

that

especially if road

can bend

by secure

support brackets.

for

standard 19'rack

(3.5").

(461.2mm

18.6"

flange will

you provide

some racks. This

shelving, support rails,

to 473.8mm).

accept

additional

use is

planned,

mount-

The

mounting

boll diameters

support for

as

the

support

can

or rear

Cooling

Allamplifiers airfrom the front of

the side

the heated offer speed control fans output level s while the heatsink

speed fans which

full

to

exceeds

An unrestricted provided.

build up within the unit

at

thermal shutdown mode.

are cooied

the unit and

the

of

unit. The

from

air

above 2 watts into 4

normally run

speed when

(128"F).

60oC

airflow into and

Any restriction

by an axialfan which

expels the heated

C800 & C'1200

rear

lhe

is hot. The

of the unit.

which

are turned

C800

at half

the internai

out from the unit must

of the air flow will cause heat

possibly

and

amplifiers expei

ohms.

& C1200 offer two

speed, and switch

heatsink

force

draws

airfrom

Standard

when

on

and stay on

temperature

the unit

units

into

cool

the

be

to

its

220-240

Volt Models

C300/Opal1202/PA3 C600/Opal2802/PA6 c800/PA8

c1200tPA12

Australian

Monitor

Amps

3

6

7

10

Watts

idle

at

Watts

full

50 100 1000 120 160

at

power

450

1400

2200

/tu

I

10

Installation

Input Wiring

NOTE. lnput

safety

The input

requires allthree

twin-core shielded cable should be

ground (earth).

to

signal

your

ground

amplifier is a balanced 3-pin system and

pins

to be connected.

is not to bo used as a

Only high

used.

quality

OutputWiring

wiring

When gauge

speaker

reduced mend using a heavy duty two core flex

amping), equivalent) as a

wire

lead the

power

10 to 12

your

to

your

speakers always use the largest

connector will accept. The longer

greater

and less damping

gauge (2mm'?to

minimum.

the losses

at the load.

2.smm'?or 50/0.25 or

the

will be, resulting in

We recom-

(four

core

flex if

bi-

XLR Inputs

as

going

follows:

When wiring for a balanced source the connector

to

inputs of

the

Pin 3 = HOT

your

amplifier should be

(non inverting)

wired

Pin2=COLD(inverting)

1=Ground/Shield

(input

1

when wiring

you

ground),

must

When wiring from an unbalanced source

ensure that

by linking the

either source equipment output

for

an unbalanced source: Pin 3 = Hot Pin

2 = Connect

Pin 1

Barrier

Ground/Shield

=

Strip

is

2

phase

(in

Inputs

connected

pins

in the

wiring. with the amplifier's output)

to

1

The barrier strip connector on

models is wired in connector as follows:

=

+ve

Pin 3

parallel

(non-inverting)

to

input

connector or at the

Therefore

(Ground/Shield)

the

Contraclor Series

with the female XLR input

Pin2=-ve(inverting)

1

=

GND

(input

NoTE. Some in-line XLR connectors have a termination

lug

that connects

Do not link this lug to

defeat the amplifier's This lug is often referred to as a'drain'and is used

provide

shielding signal

tion, eg

induced into

a circuit to the chassis

purposes.

grounds

to help in reducing

directly to the chassis

input

This is usefulwhen further isolation of

is

required between source and destina-

grounds

signal

ground)

signal

ofthe

1

at the amplifier's inpui as

grounding

earth

from

scheme.

(not

signal

loop noise, or noise

magnetic fields.

stray

connector.

it will

ground)

Binding Post

When terminating to the

output connectors, banana

be used. The

terminal is negative.

lf running in

used. Channel A and channel

'Speakon'

(C800

&

When

using the

for speaker output, use only the mating NEUTRIK NL4FC

in-line

connector.

channels can be fed from a single connector.

'Speakon'

Two

amplifier.

channel

Wiring Diagrams).

the channel B output.

ing

outputs

connectors-

to

for

C 1200 only)

The

A & channel B outputs

Outputs

red

BRIDGE

provides

B

4

mm

binding

plugs

terminal

mode,

is

only

positive

the

the negative output to the load.

post (banana

or spade type lugs can

positive

the red

and the

binding

output to the

posts

Outputs

NEUTRIK

This connector is

connectors are

channel

The

separately or together through a single or

'Speakon'

A

channel

gives you

This

(NL4MP)

designed so that both

provided

actually carries both

(see

figure

'Speakon'

B

options of connect-

connector

on the other

4:

Speaker

carries only

jack)

black

are

load

two

/tu

Installation 11

A/LFFT

C8

OR

cH 8/FlrcsT

SPE AK ON

SINGLE@NNECTION

DUAL CONIGCNON

CH

A/L

CHA

SPEAKON

BRIDGEDCO

NECTION

Australian

Monitor

Figure

4 Neutik'Speakon'

Connector wiring

/tu

t2

4.

Operation

IMPORTANT

All

signal source equipment should

This

not only

well.

Faults

ment properlyearihed.

(ungrounded) piece

path

to

input. lf

input to

which may be

ensures

can and do occur

where the chassis can become

ground

fault

the

yourampliferand

Before making

ssrve the following:

1. Ensure

lhe rear

2.

Ensure that all system

the mains

panel

to a common

equipment separated

3.

Check the continuity of all interconnecting leads

amplilleq

conductors.

4.

Ensure that the

can adequately

plifier.

from

by

ensure thatthere are

Before operating

-

the

attenuators

wise).

-

power

the

-

the

-

the BRIDGE

ning

switch

GROUNO LIFT

'out' position).

Switch is not

the amplifier in

Powering

REMEMBER

The

amplilier

you

tum

turn OFF.

We recommend

down when

should be the last

ON, and the first

fuming the unit

your

ln

which could

cunent

ingtances the

lhese

of equipmentwill

is large

lookforthe

you!

any connections

voltage supply matches the label

your

of

point.

large

are at the OFF

amplifier.

grounds (earlhs)

Avoid

multiple

distances.

power

handling of

with

cope

your

amplifier, ensure lhat:

is

OFF.

Switch

bridged

Up

turning

the attenuators on

be adequately earlhed.

safety but

possibly

powering

power

the

is not

engaged unless

piece

on.

everybody else's

in mains

enough

mode.

connected

fault in a

look

be

itwill destroy

next available

your

to

several

sources that may

no

open orshort circuited

your

power

output of the

position (fully

engaged

piece

of

of equipment that

'live' if it is not

forthe

your

are connected

load

equipment

your

equip-

'floating'

shortest

amplifier's

amplifier

pieces

to

(speakers)

anticlock-

(should

you

are run-

amplilier

the

paih,

ob-

your

am-

be in

that

you

The

ICS

circuit also operates

as

seconds signal

When

seconds before

the ICS

this mute willrelease,

pass

to

switching the amplifier

circuit to reset.

Level Matching

The normal

position the amplifier

back

on

amount

NOTE.

of

lf full

be

amplifier with the front

position,

(tully

(anticlockwise)

marked

power

otherwise clipping

some resultant

power

is

achieved.

Sensitivity

Your

amplifier is a linear device

inpulto-output

age

swing is determined

the load, load

signal.

The voltage

c300 c600 c800

C12OO lPA12 45.25 x

Opal

Opal2802 29.0 x

The

attenuator is

clockwise) is nominally: +4.0d8

+2.6d8

PA3 PA6 PA8 37.0

'12O2

input

(1.23

(1.04

30dB

a

unattenuated.

inputmute.

allowing

OFF wait

switching the unit

position

clockwise, no attenuation).

operates al full

output is required

for lhe

reduces

the

on

attenuator scale.

panel

on again. This

'

attenuator

gain.

Tuming

the input

you

should

attenuator

of the input

distortion

voltage

type, and the duty

gain

facior

will

occur

operating with a fixed

gain.

The maximum

by: the applied mains voltage,

cycle of the applied

your

of

19.9 x

29.0 x

x

amplifier is:

(or (or (or

(or33.11d8)

19.9

x

(or

(ot

sensitivity for

at the

volts) for raled

volts) for

'0

your

amplifier when the

dB' attenuation

power

into an

power

rated

into a 4 ohm load.

After two

any applied input

a couple of

allows

is the

ln

the attenuator

sensitivity by the

above the

before full output

25dB)

27dB)

31.36d8) 25dB)

27dB)

position (fully

'0

posilion

this

operate

circuitry and

output

I ohm

your

-15d8

volt-

load.

dB'

you power

When

establishment

lnrush

Cunent

the tirsl

prevent high starl-up

0.5 seconds. This limits

'nuisance-tripping'

/tu

up,

period

Supression

cunents.

your

amplifier

before it will

(lCS)

goes

through an

accept signal. The

circuit is in operation for

the mains cunent to

of circuit breakers caused by

Each

channel of

your

impedanceof25k Ohms

signal

load

for any signal source.

source (i.e.

output impedance

an

a difficult

The

fier) should have

amplilier has a balanced input

(25,000)

the equipment feeding the ampli-

and should

notpresent

Ohms

of 2k

Operation

l3

(2,000) the

lnput

See the

lower

or

cabling.

overload

specification

tion.

Hum

Mctstequipment

under

ment ment

The

plague

Problems

ideal

conditions.

and to

safety earth

problems

'E's

three

your

audio system

a) Electrostatic b)

Electromagnetic

c) Earth loops

Electrostatic

elements

affects higher The mains lead reduced

ing

ductor

causing

source is

or

by moving

additional

which

impedance paths,

generally

a speaker

electrostatic

forms

Electromagnetic

into

system

paths.

mains

It

is

interference,

viding

Earth loops

pieces

earth.

This

is

occurs

plugged

where

cunent

due to

between the appears amplified

elements

Radio

transmitlers

transformers

generally

but

a magnetic

can

of equipment

far

by

when

source equipment

into

ditferent

the safety

flowing

lhe wire's resistance.

ampllier

to the amplifier's

as hum.

to

avoid unwanted

occurs

is

designed for minimum

will

of hum

+20.5d8u

at

section for more

When

connected

in an electrically

often

occur.

and hum related

are:

radiation,

radiation

radiation,

capacitively

and

an interference

such

a nearby

lead. The

the

offending lead

a banier to

radiation

that mainly

shielding

high

problem

the field).

induces

effect

or stray

are

often the cause

more

difiicult to

again,

moving the

(i.e.

shield

arise from the interfacing

and their

the most

common

eliminate

a steel

connections

cause

and

points

along

earth wiring

through

the wire

has

produces

This voltage

earth and source

input

as

an input

highfrequency

(8.25

volts).

detailed

hum

when

to other

noisy

noise which

couples

voltage

as amplifier

voltage

away, or

(i.e.

interference

magnetic

an

low

of

can

this

earthed

to

that

such as

usuallybe

by

cunents

impedance

tields

problem.

this

source

shield)

away

should hetp.

ofthe

to

of hum,

the

amplifier

the

safety

earth and

a cunent

in it. The

a voltage

ditference

equipment

signal

loss

informa-

used

equip-

environ-

can

system

mainly

inputs.

provid-

con-

from

kind

of

pro-

or

various

safety

and it

are

drop

earth

and is

in

There problems:

1 .

2. Ensure

3. Ensure

Signal

(c800

When

may

be due

The

Lift'switch

from

Always

are

should a balanced

outputs,

anced

NOTE

lf

the input

adequate

equipmentdoes disconnect connect it

input. This

actually earth-

are thr'ee

Ensure

your

things you

power

niains

i.e, without'equipment

refrigeration earth

ground

mon possibility

equipmentto

or lighting

circuit.

all

equipment of circulating

or safety

the

same

that balanced

fier

are

connected

to

Gound-Lifr

& Ci200

proper

still have

to any

Contraclor

the

amplifier.

noise

ensure

down when you

only be

lhese

outputs.

goes

onty)

system

some

of the

Series

which

may result

thatyour

used when

signal

are often

ground

shielding

not

your

shield

to the

will

ensure

to the

hook-up

hum

previously

disconnects

A substantial

engage

source.

lift

switch is

of the input

provide

from input

'drain'

amplifierchassis

can

for

the audio

on il

which

within

lhe

point.

earth

eartl

ground

signal

earth

at

Switch

has

or hum

amplifiers

by

use

amplifieris

this

the amplifier

Be wary

no

more

wiring.

adequate

conlact

the shield

do to avoid

system is

such as

wilt

air-conditioning,

generate

system

shares a

This will reduce

cunents,

potential.

leads

one end

been

going

only.

carried out, noise.

mentioned

a

offand

,signal

ground

hum

the attenuators

have

lhe input

drop in of this switch.

switch.

is

operated from

quasi-balanced

of

than floating

you

used,

lf

the signal

shielding

connector

going

to

the amplitier,s

your

on

and

subsequenflyto

earth loop

.quiet'

noise in thl

to

the ampli-

This may

gremlins.

Ground

wiring

and or hum

This switch

unbal-

must

ensure

source

you

musl

1

and re-

input

wiring

com-

the

you

Ausbalian

Monitor

/tu

14

Bridge

5.

term BRIDGE

The

fierchannels

in series

channels.

Channel outsut

phase

with the

Using

180'provides

powerinto

(a

A

is in

reversed

input signal.

amplifiers

two

the

output-

A common

70 and

used

use of

100

in bridge

requirements

deliver

the

Mode

is used

to

used

are

bridge)

is used

listed

between

lhe'dominant'

as

phase with the

output

its

so

his way

a doubling

ouputis

The

load.

amplifierin

an

distribution

volt

provide

to

mode

for a sPecific

voltage

when two

drive lhe

ouhuts of

is exactly'180'out

ofthe

lines or

independent

same load.

input signal;

phase

with a

voltage and foultimes

nowan

mode

bridge

the amplilier

lhe conect

load. Each

load of I ohms.

into a

The

the two

channel

amPlifier

channel

ofphase

difference

balanced

active

is for driving

voltage/power

amplifier

ampli-

load is

and

B

can

its

is

of

the

be

can

shown

As

your

up

amplifier

Whilst the

1. Connect put

XLR.

control

for both channels.

2. Engage

amplifier.

Connect

3.

terminals,

to the channel

goes

load

connections

in the diagram

running in

for

amplitier

the signal

The channel

the

your

i.e. the

to the

is OFF:

source lo the

'push

to

load between

positive

A output and

channel B output.

required.

BRIDGE

the red

of the

side

the

three steps

channel

negative side

there are

A attenuator

bridge' switch

in setting

mode.

A female

becomes

on the

binding

load is connected

There are

the level

rear of the

Posl

no further

in-

output

ol the

PA3 / OPAL

/

c300

/ PA6

c600 c800 /

c1200

PA8

I

c=:=-)

(-_-----''-

c-:--)

c_::_=-

C ::)

/ OPAL

PA12

1202

2802

35V

70v 80v

100v

-F:+-

-

A.t?/.\ldHHtrh

e

\2lql44F#F,',,HN

FROM SIGNAL SOUBCE

A

@r

Figure 5

/tu

Bridge

Mode

Speaker

Connection

(All

Models)

Load

6.

NOTE

Ensure adequate

indicators ing

two ohm loads.

The load

very

complex and

tive, capacitive,

the

complex interaction

from loudspeaker amplifier

Loudspeakers

nal impedance.

only to

As

an example,

of say I

at resonance,

nance

guard

to

that a loudspeaker

does not really

operatingwithin

This nominal impedance

the actual

a

ohms, may have

drop to less

peak

and

frequencies.

A

6 ohm load makes

ohm load

at the

same voltage,

Though various

nal impedance,

(with

apologies

some loads

to G.B.

As well as this

waveforms than the

bench tests.

The

found in

'steady-state'

power

output of

cation sheet is

resistive

Though

that exist, it

swing rating

(Ampere)

amplifier's

load for

this method

only

(before power

clipping) for a

does not

capability of

ability to sustain high

Impedance

ventilation

against thermal

at different frequencies

resistive

to loudspeaker,

characteristics

loudspeakerwith

then increase to

an amplifier

loudspeakers

Shaw).

burden

actual use can

sinewaves

your

derived from voltage

a

sine

in

is

gives

an

give

the amplifier, nor

and monitor

shutdown

presents

or a combination

of these

exjst.

an

attributes,

a definilive

an enclosure

of the speaker.

a nominal

impedance

than 6 ohms

over 16

work

it

as

requires

may

have

are more'equal'than

on the amplifier,

demand

used in

at

given

quoted

a

the various

of

load.

amplifier

wave

line with

indication

an indication

energy waveforms.

the

FAULT

when

to an

amplifier is

can be induc-

of these.

which

load for

carrya

nomi-

is a rough

impedance

of over

'harder'

50 ohms

after

the reso-

ohms for higher

than

more

current.

an equal nomi-

others

the

transient

more current

most

amplifier

on

the specifi-

excursion into

given

frequency.

standards

maximum

This

does it

method

of the

voltage

current

show the

driv-

With

alter

an

guide

an 8

of

Your

amplifier

twice the sheet

waveforms.

This

extra current

ing

and is

loudspeaker

Your

amplifier is

BRIDGE

that when the currents

will

cause

higher

The

front

an indication

operator

stage.

lf the

Fault

or do nol illuminate can

be considered

lf

the Fault LED indicalor

'clip'LED

and/or

For

the more

tion

of the Fault

interpreted continuously past output stage,

a

down.

is designed

curent

to cope

impedance

diificult.

with

the headroom

and load

jnto

mode

driving 2

running

greater

panel

fault indicators

of the 'difficulty'

indication

an

indicators

LED

then the load

complex

as the output

fuse

than that

difficult loads

reserve

the amptifier

deal with

that

is dissipated

able to

drive 2 ohm

4

ohms. The

ohm loads

in the

heat

build up within

loads

will.

of the heat

until well into

as normal

starts to flash

should be considered

and/or

LED

on

point

this

blowing

to

be able to

shown

on the and/or high

is the result

utilizes

the'reactive

within

operator

or bridged 4

output stage

can be

of the load

build up in

flash with

the Status

clipping

or easy.

difficult loads,

programme

level limit.

could result in

premature

or

deliver

of

more than

specification

over-engineer-

to controlthe

energy'from

the ampliller.

loads

or operate

must be aware

ohm loads

are very large

the amplifier

used to

and will

the output

'clip'

then the load

before

the Status

the illumina-

peaks

should

Driving

the output

muting

thermal shut-

energy

the

that and

than

provide

give

the

LED,

complex

be

of the

I5

in

Australi,an Monitor

/tu

t6

7. Maintenance

Your amplifler will

nal

adjustments

optimum

To maintenance or so.

performance.

provide years of unhindered

need minimal

need

inspection

to be made

Fuses

WARNING

sure the unit

Make

capacitors time

positive

The

loading to apply

carlridge. area of environments.

help renew the contact

You

should

and

The surface

the fuse can

replace the

discoloured.

is OFF and

to discharge

negative

force to

be subject to oxidization

Removing

maintenance.

to the unit to maintain

operation

be carried out

every 12 months

give

before

fuse holders use spring

rail

the contact

around

and re-installing

surface.

fuse if the element is sagging

removing fuses'

faces of the 3AG fuse

the mechanical contact

No inter-

we

suggest

the main filter

in some

the fuse will

'1

l

a

or

When

checking

inspection alone. continuity.

failed fuse, do not

for a

You should use an ohmmeter

Fans

to the openness ofthe air

Due

very little dust should settle has been designed

that do settle

cles

hinder the cooling of the unit.

Over time, dust

fan blades and

for this to

taken and the amount

so that any

within the amplifier

may build up on reduce their cooling

happen will depend on the environment

of use.

rely

path

through

within the amplifier.

dust and/or

your

foreign

will not unduly

the leading edge

efflciency. The

visual

on

to check

amplifier,

The

unit

parti-

of the

time

/tu

8. Wananty

,'7

Australian

Sydney,

purchaser ised

defecls in

ranty

Australian

unil

comes service parts

This

conlacts,

or defects

misuse, age, alteration

unauthorised personnel.

It is

maintenance

vals

as recommended

manual.

Monitor

N.S.W.

of each

Australian

period

Monitor

material

from

Monitorwill,

or component

defective

during

labour

or

warranty

or malfunctions

the

to

does

thermal

or malfunctions

abuse,

connection

the

owner's

Australian

operation

without prior

inspections

Pty

15

21

amplifier

and workmanship

the

original date

covered

period the original

not

problems

to faulty

responsibility

in

l/onitor

Ltd,

oi 29

Hope

Australia,

dealer)

at its option,

ofthis warranty,

cover blown

wanants

(purchased

that it will

of

repair

by

this wananty

under

owner.

due

to

obstructed

resulting

with

the incorrect

equipment,

factory

the maintenance

approval

to

are canied

reserves

ensure

out

St,

Ermington,

the

from

an

be free

for

the whole

purchase.

replace

or

which

normal

at no

charge

fuses,

faulty

from

accidents,

modification

or

service

that

at regular

section

the

right

original

author-

from

war-

any

be_

use

and

for

fuse

airflow,

AC

volt-

by

normal

inter-

of this

to refuse

or

warranty

care in

service

use and

To validate

complete tralian

Monitor

purchase.

of

To

obtain

shipped

Australian

expense.

Units

for waffanty

orforgery

Australian tial use

Australian

and

to

with

damages,

or misuse

specifications

maintenance

this

wananty,

and mail

warranty

an aulhorised

Monitor

a defaced

of

Monitoraccepts

Monitor

purchasers.

the

at the

service. purchase

whether

of its

reserves

at

wananty

above

service,

serial number

Any

receipt

direct

products.

any

the

ownerfails

of the

the

original purchaser

registration

address

the

Australian

above

address,

evidence

will

no liabiliV

or indirect,

the right

time without

to take

amplifier.

within

equipment

Monitor

will not

of

alteration,

also void

for

any consequen-

arising from

to

alter its

notice

reasonable

must

card

to Aus-

fourteen

days

should

dealer

or

at the

owner,s

be

accepted

erasure

this warranty.

designs

or obligation

be

to

the

Australiian

Monitor

plaat.

compl.L

lh.

,[odocl.

O?El Wa.r.ntt

COPAIIV

aDn=13

aTA?E

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Ensure that

Use this

copy

fu

WARRANTY

lhl.

Tht.

you

c.rd

c.rd t.

ta

.lLcfiv.

fill

out and

to record

nsvanmMonibr

REGISTRATION

IMPORTANT

and .dum

to ba

_ oor TnY

a duplicate

lt lmrn.dh.ly

a.nt D|RECTLY

O'ILY

upon r.c.lpt

aEnnl. xc

o rE

your

send

wananty

of the detaits.

to /lu.tr.ll.n

Rncrla!@

alLr unpsthg

Xolttto..

ol thta

c..al.

registration

card.

/tu

l8

Specifications

9.

Model:

Output

F.T.C.20

(pre-stress

for t hr &

both

E.l.A. (pre-stress at

single both channels

Pulsed

10% duty 10% duty

Bridge

2 Ohm single

both channels

Distortion

@

THD

IMD

IMD CCIF

Frequency

-0.5/ -0.15 dB:

-3dB:

Output

@1kHz

Damping

@

Power

Hz

4dB below

rated

channels

1 kHz,

channel

1 kHz. at

@

cycle, cycle,

mode Capability

channel

0.5 dB

below

1

kHz

@

SMPTE

Impedance

1 kHz, I ohm

C800

-

kHz

2Q

power

driven

<0.05%

power for 5

rated

driven

single

both

driven

cliPping

(60

Hz

(14

kHzl

Response

Factor

load

0.1%

@

rated

for 5

THD

onset

channel

channels

re 4 ohms

/ 7 kHz

15 kHz

-lHD

Power

min)

ol clipping

driven

4:'1)

1:1)

Power

ohm

I

Power

4 ohm

260w 400w

300w

280W

860W

510W

500w

480w

430W

630W

600W

1020W

<0.005%

<0.015% <0.008%

20Hz-20kHz

5Hz-95kHz

milliohm

15

(typical)

500

Input

Line to Line.

Input

At At

Input

Impedance

Sensitivity

rated output rated output

CMRR

@1kHz

Voltage

Gain

@1kHz

Output

20

(leading

SIew

20 (leading edge)

Signal

linear

A weighted

Rise

kHz square

edge)

Rate

kHz square

/ Noise

(30

kHz)

Crosstalk

@1kHz

Weight

net

packed

Dimensions

inch

handles

EIA

excluding

including

(19

Balanced

8 ohms

into

into 4 ohms

Time

127VPP

wave

127YPP

wave

ratio

mounting,

rack

2

units

25 kohm

(+3.8dBu)

1.2V (+2

1

0v

>80

31 dB

(=

2.4 t\S

42VlPtS

100 dB 104 dB

<

37.51b

42.161b

HxWxD

19

x

3.5

482

x

88

3.5 x 19 88 x 482

high)

3dBu)

dB

x)

37

-90 dB

x 14.8

x 375

x 17.9

455

x

17 kg

/

l20kg

inch

mm

inch

mm

/tu

Specifications

19

Model:

Output

F.T.C. (pre-stress

for t

hr & rated

both

channels

E.l.A. 1 (pre-shess

single

channel

both

channels

Pulsed

1070

duty

10%

duty

Bridge

2

Ohm

single

channel

both

channels

C1200

Power

20 Hz -

mode

Capability

20

4dB

driven

<0.0570

kHz.

at rated power

driven

1 kHz,

@

cycle, cycle,

driven

kHz

below rated

power

at

onset single both

Distortion

0.5

dB

below

kHz

(14

Response

dB:

clipping

Hz

/ 7 kHz

kHz

I

@

THD

IMD

I

@

SMPTE (60

CCIF

Frequency

-0.15

-0.5/

-3dB:

Output Impedance

@1kHz

Damping

1 kHz,8

@

Factor

ohm

load

0.1% THD

@

power

for

S min)

THD

for

of clipping

channel

channels

re 4

ohms

4:1)

'15

kHz

S min)

driven

1:1)

Power

8

ohm

430W

400w

1200w

800w 700w

<0.005% <0.015% <0.008%

20Hz-29kHz

5Hz-95kHz

15

milliohm

(typical)

500

Power

4

ohm

700w

605W

930W

900w

1400w

(typical)

Input

Line

Input

At rated At rated

Input

@'l

Voltage

@

Output

20 kHz

(leading

Impedance

to Line.

Sensitivity

output output

CMRR

kHz

'r

kHz

Rise

square

edge)

Gain

Slew Rate

20

kHz

square

(leading

Signal

linear (30

A weighted

edge)

/

Noise

kHz)

Crosstalk

1 kHz

@

Weight

net

packed

Dimensions

excluding

including

(19

inch

handles

EIA rack

Ealanced

into

8

into 4

Time

wave

ratio

mounting,

ohms ohms

145vpp

2 units

25 kohm

1

.23V

'1.1V

>80

33 dB

(=

2.4

50V/pS

100 105

<

42

47.5

HxWxD

3.5

x 19 x'14.8

88 x 482 x

'19

3.5 x 88 x 482

high)

x 17.9

(+4dBu)

(+3dBu)

dB

45

x)

pS

dB dB

-90

dB

lb/19k9

tb

I 2,t

375 mm

455

x

kg

inch

inch mm

Ausbda

Monitor

/tu

20

Specifications

Model: PA-8

Output

E.l.A. 1 kHz,

(pre-stress

Pulsed

10% 10%

Bridge mode

2 Ohm single both channels

Power

at

1

@

duty cycle, single duty cycle,

capability

channel driven

Distortion

0.5 dB

@

THD IMD IMD

below clipping re 4

1 kHz

@

SMPTE

CCIF

<0.05%

rated

kHz, at onset of clipping

driven

(60 (14

THD

power

for

5 min)

channel driven

both channels driven

ohms

Hz

7

I

k{z 4:11

kHz

I 15 kHz

't:1)

Power

8 ohm 4

Power

ohm

300w 480w

630W 600W

860W 1020W

510W

500w

<0.005%

<0.01

5%

<0.008%

Input

Line

Input

At rated At rated

Input

Impedance

to Line, balanced

Sensitivity

output into output into 4

CMRR

8 ohms

ohms

@lkHz

Voltage

Gain

@lkHz

Output Rise

20 kHz square wave (leading

edge)

Time

127vpp

Slew Rate

20 kHz square wave 1?7vpp

(leading

edge)

25k ohm

(+3.8dBu)

1.2V

1.OV (+2.3dBu)

>80

dB

31 dB

(=

37x)

pS

2.4

4zvllts

Frequency

-0.5/ -0.15

-3dB:

Response

dB:

Output Impedance

@1kHz

Damping

1

kHz, 8 ohm load

@

Factor

/tu

20Hz-20kHz

5Hz-95kHz

15 milliohm

(typical)

500

Signal

linear

A weighted

(30

Noise

/

kHz)

Crosstalk

@1kHz

Weight

net packed

Dimensions

excluding handles

including

('19

handles

inch

EIA rack mounting,

ratio

3.5 x 19 x 88 x

3.5 x 19 x 17.9

88 x 482 x 455 mm

2 units high)

100

dB

104

dB

<

-90

37 .slb 117 ks

42.61h I 20kg

HxWxD

'14.8

482 x

375

dB

inch

mm

inch

Specifications

2l

Model:

Output

E.l.A.

(pre-slrcss

single both

Pulsed

10%

10olo

Bridge

2 Ohm single both

Distortion

0.5

@

THD

IMD

Frequency

-0.5/

-3dB:

Output

@1kHz

Damping

1

@

Power

'1

kHz,

at rated power

channel

channels

1

@

duty

cycle.

duty

cycle,

mode

capability

channel

channels

dB

below

1

kHz

@

SMPTE (60

CCIF ('l4kHzt1S

-0.15

dB:

Impedance

Factor

kHz,

I ohm

PA

-

<0.05%

driven

kHz,

driven

THO

driven

at

onset

single both channets

clipping

Hz I Z

Response

toad

12

for

of clipping

channet

re

4 ohms

kHz 4:j)

kHz

5 min)

driven

j:1)

Power

8 ohm

430W

400w

1200w

800w 700w

<0.005%

<0.015o/a

<0.008%

20Hz-20kHz

5Hz-95kHz

15

milliohm

(typical)

500 (typical)

Power 4 ohm

700w

605W

930W

900w

1400w

Input

Line

Input

At rated At

Input

Impedance

to

Line,

Sensitivity

output

rated

output

CMRR

@lkHz

Voltage

@lkHz

Output

20 kHz

(leading

Slew

20

(leading

Signal

linear (30

A weighted

square

edge)

Rate

kHz square

edge)

/ Noise

Crosstalk

1 kHz

@

Weight

net

packed

balanced

Gain

Rise

kHz)

into into

Time

wave

8

ohms

4

ohms

14SVpp

145vpp

ratio

25k ohm

1

.23V

1.1V

>80

33 dB

(=

2.4

50V/pS

100 105

<

42 lb

47

(+4dBu)

(+3dBu)

dB

45

x)

sS

dB dB

-90

dB

i 19

.slb

I 21kg

k9

Australian

Monitor

Dimensions

excluding

including

(19

inch

handles

EIA rack

mounting,

2

units

HxWxD

3.5

x 19

88 x 482

3.5 x 19 88 x 482

high)

x 14.8 inch

x

375 mm

x 17.9

inch

x 455

mm

/tu

22

Specifications

Model:

Opal 1202/C300/PA-3

Output Power

'1

E.l.A. (pre-stress

single both

channels

Bridge

kHz,

at rated

channel

Mode

<0.05%

driven

Distortion

0.5

dB below

@

THD

IMD IMD

Frequency

-0.5/

-3dB

1 kHz

@

SMPTE

CCIF

-0.15d8

(60

(14kH'zl15

Response

THD

power

for

clipping re 4

Hz

7

/

kHz 4:1)

kHz

min)

5

ohms

1:1)

Power

I ohm 4 ohm

120W

'120W

340W

<0.005% <0.008%

20 Hz-20kHz

5 Hz- 95kHz

175W

160W

<0.005%

Input

Line

Input

At rated

Input

Impedance

to Line,

Balanced

Sensitivity

output into

CMRR

@1kHz

Voltage

Gain

@1kHz

Output Rise

20 kHz (leading

square wave

edge)

Slew Rate

20 kHz square (leading

edge)

8 ohms

Time

1 13Vpp

wave 145vpp

1

.23V

2.4

35V/pS

25 kohm

(+4dBu)

>81.5d8

28dB

(=

19

x)

pS

Output Impedance

@1kHz

Damping

1

kHz,I

@

Factor

ohm load

15

(typical)

milliohm

250'.1

Signal / Noise

linear (30

A weighted

kHz)

Crosstalk

@1kHz

Weight

net packed

Dimensions

excluding handles

(19

inch

EIA rack

ratio

mounting,2

3.5 x 19 x 88 x 482 x

units hiqh)

102

dB

104d8

<-90d8

lb

33

37 lbllTkg

HxWxD

14.8 inch 375

/

'15k9

mm

/tu

Specifications

23

Model

Output

E.l.A.

(pre-stress

single

both Bridge

:

Power

1 kHz,

at rated power

channel

channels

Mode

Distortion

0.5 dB

@ THD

li/D

IMD

Frequency

-0.5i -0.15

-3dB

Output

below

1 kHz

@

SMPTE (60

CCIF

dB

Impedance

Opal

<0.05%

driven

(14

Response

driven

ctipping

Hz

I 7 k1z 4:1)

k9z

THD

I 15

2802/

for

5

re 4

ohms

kHz

C600/pA-6

Power

8 ohm

min)

215W

200w

560W

<0.005%

j:1)

<0.015% <0.008%

20

Hz-20kHz

5Hz-95kHz

Power

4 ohm

300w

280W

Input

Line

to Line.

Input

At rated

Input

CMRR

@1kHz

Voltage

@1kHz

Output

20

kHz

square wave

(leading

Slew

20 kHz

(leading

Rate

square

Impedance

Balanced

Sensitivity

output into

Gain

Rise

Time

edge)

wave

edge)

I ohms

1 13vpp

145vpp

1

.23V

35V/pS

2.4

>81.5d8

31dB (=37x)

25 kohm

(+4dBu)

pS

@1kqz

Damping

1 kHz,

@

8 ohm

Factor

load

15

milliohm

(typical)

250:1

Signal

linear (30

A weighted

/ Noise

kHz)

Crosstaik

@1kHz

Weight

net packed

Dimensions

excluding

(19

inch

handles

EIA rack

ratio

mounting,

2

units high)

HxWxD

3.5 x 19 88

x 482 x

100

dB

104d8

-90d8

/

x 14-8

375 mm

'tskg

inch

33 lb

37 lbllTkg

Australian

Monitor

/tu