AUSTRALIAN MONITOR CONTRACTOR Bedienungsanleitung

Australian Monitor

PROFESSIONAL AUDIO POWER AMPLIFIERS

CONTRACTOR

and

opof

Audio Amplifiers

OPERATION MANUAL

IMPORTANT!

Please read carefully.

This Operation Manual contains important

information regarding safety precautions,

performance, maintenance and operation of your

power amplifier. You should familiarize yourself

with the contents of this manual before operating

your amplilier.

Safety Precautions and Labelling

The rear panel of the unit has a number of markings and

inlemationally recognized symbols related to the hazards

and precautions that should be taken when operating

MAINS connected equipment.

The presence of a LIGHTNING FLASH with an arrow-

head contained within the boundaries of a equilateral

triangle is intended to alert the user that dangerous

uninsulated voltages may exist within the units enclosure.

These voltages may be of a sufficient magnitude as to

constitute the risk of an electrical shock.

This symbol is reinforced with the text:

ICAUTION!

RrsK oF ELEcTRTcAL sHocK /lt\

Do Nor oPEN ,/ t \

REFER SERVICING TO

QUALIFIED PERSONNEL ONLY

The user should not attempt to service the unit. Only

qualified and knowledgeable personnel familiar with the

intemal wo.kings of the unit should attempt any repair,

servicing or authorized modification to the unit.

NO USER SERVICEABLE PARTS INSIDE

The unit does not contain any parts which the user can

service or re-use in this or any other product.

lf you are in need of special assistance and the informa-

tion you require is outside the scope of this manual,

please contact your nearest service agent or Australian

Monitor direct:

THE TECHNICAL OFFICER

AUSTRALIAN I\,4ONITOR Pry LTD,

29 HOPE ST

ERMINGTON. SYDNEY. N.S.W.

AUSTRALIA. 21 15

Phone Fax

Local (02) 874 9355 (02) 874 9366

lntemational (612) 874 9355 (612) 874 9366

The presence of an EXCLAMATION MARK contained

within the boundaries of a equilateral triangle is intended

to alert the user thal there is important operating and

mainlenance literature that accompanies the unit.

IWARNING!

DO NOT EXPOSE TO EITHER

RAIN OR MOISTURE

The unitshould not beoperated in a situation where it may

encounterlhe entry ofwater, rain, or anyfluids. To expose

the unit to the above conditions may make the operation

of the unit hazardous and increase the risk of electrical

shock.

/tu

Contents

1. lntroduction + List of Illustrations

2. Controls, Connectors & lndicators 5

3. lnstallation

4. Operation

5. Bridge Mode

6. Load lmpedance

12 Figure 1 . Block Diagram

14 Figure 2. Front Panel Layouts

15 Figure 3. Rear Panel Layouts

7. Maintenance 16 Figure 4. 'Speakon' Connector WirinS .l 1

8. Warranty 17 Figure 5. Bridge Mode Speaker Wiring 14

9. Specifications 18

Features:

- Custom designed, heavy duty alloy chassis. - 1 Watt output indication.

- Open modular construction, for ease of servicing. - Output clip indication at -'l dB

- Symmetrical weight distribution Massive heafsink and heat-exchangers.

- Well-regulated, high current power supply. - Efficient front to back cooling.

- High VA-capable toroidal mains transformer. - Single speed automatic axial fans.

- Binding post output connection - Output fault indication.

- Stereo or bridged / mono operation. - Plug in signal processors (optional).

- lnput signal XLR and tag strip connector - High-quality, close{olerance components

- 21 Position detented attenuators. throughout.

Protection Features

- Suppression of inrush cunent at mains turn-on. - lndependent DC supply rail fuses.

- lnput muting at turn-on. - Layout, grounding, decoupling and componentry

- lnput overvoltage protection. have been optimized to provide the user with

-Radio-frequencyinterferencesuppression. stability,reliabilityandlongevity.

- Short-circuit protection and indication.

Australian Monitor ltu

l.Introduction

Congratulations on choosing Australia n Monitorlot your

professional amplification requirements.

The design ofyouraudio poweramplifierembraces all the

aspects of a well designed unit. The visual design, me-

chanical, electrical and sonic parameters, along with our

dedicated manufacturing processes, have all been

optimized to provide a professional tool that exhibits

quality, reliability and longevity.

Figure 1 shows a block diagram of the amplifier. Each

channel of the amplifer comprises a balanced active

inputwith a buffered attenuator driving a differentialclass

A drive stage which in turn drives a fan-cooled, class AB,

MOSFET output stage configured as a source follower.

The unit operates from a high current-capable linear

power supply.

The Contractor, Opal and pA Series are 2 units tall (3.5"),

in 19' wide rack mountable cases.

These units have been specifically designed to deliver

their high power output with minimal distortion, and pro_

vide the critical degree ofcontrol required by your speak-

ers, at high duty cycles for exlended periods.

PRE,AMP

ST AGE

Figure 1 Amplifier Block Diagram

INSERT

POINT BUFFER

S TAGE DRIVER

ST AGE OUTPUT

STAGE

OUTPUT

CHA

o/P

CHB

O/P

/tu

2. Controls, Connectors & Indicators

Models and Variants

While these amplifiers are designed to suit different

applications, all variants use the same electronics.

The output powers are:

Contrac'tor Series :

C300 = 2x

C600 = 2x

C800 = 2x

C1200 = 2 x

175W

300w

400w

600w

4 ohms

Opal Series :

Opal 1202 =

Opal 2802 =

PA Series:

PA-3 =

PA-6 =

PA-8 =

PA-12=

'175W 4 ohms

300W 4 ohms

175W 4 ohms

300W 4 ohms

400W 4 ohms

600W 4 ohms

c600 -o,g

ol:lr \-:-:

fu,Austanan Monitor

NOD

Contractor Series

Opal Series

Figure 2 Front Panel Layouts

Aushalian Monitor /tu

6 Controls & Connectors

Front Panel

Figure 2 shows layouts of the front panels; the section

numbers refer lo areas on the drawing. The functions of

the controls and indicalors are as follows:

l. Faultlndicator

This amber LED will flash when a fault condition

exists.

The fault detection circuit monitors the difference

between drive and output of your amplifier.

A short on the speaker output or a blown negative

rail fuse the LED will flash brightly in sync with the

programme. This LED willalso flash with programme

peaks forgross overloads; or if the load is 2 ohms or

less.

The circuit has two stages of operation:

1. lt will provide indication (e.g gross overload) but

does not affect the input signal_

2. lt will indicate and mute the input signal (e.g

shorted output).

2. Attenuator

Level control for your amplifier is provided by a 21

position detented potentiometer and indicates gain

reduction in decibels from the '0 dB' position (maxi-

mum gain, no attenuation).

3. Power Switch

Press the switch to the right for power ON. press

the switch to the left for power OFF. At start-up

(turn-on) the input to the amplifier is muted by 30dB

for approximately two seconds.

4. On/Thermal Indicator

This is a dual colored LED which will normally be

green and indicates that the amplifier is on and

receiving mains power.

ln the advent of a thermal overload this LED will tum

red indicating that the internal operating tempera-

ture of the amplifier has exceeded a safe level of

operation and that the amplifier has shut down. The

fans will continue to run and once the amplifier has

had a cooFdown period the unit will restart, auto-

matically providing inrush cunent suppression and

input muting.

5. Status Indicator

This is a dual colour LED which displays the status

of the output stage and displays three tevels of

operation. These levels are:

Below 1 watt (unlit)

1 watt and above (green)

1dB below actual ctipping (red)

The LED will turn green once the output voltage

exceeds 2.828 volts (1 watt re 8 ohms, or 2 watts re

4 ohms).

The LED will change to red once the output exceeds

the -1dB point before actual clipping of the amplifi-

er's output stage. The threshold of the -1dB point is

with reference to the amplifier supply rails and will

alter with changes in the mains supply, changes in

the load, and duty cycle fluctuations.

The attack and delay time (ballistics) of the status

circuitarethoseof a Peak Programme Meter(p.p.M.)

lf using this indicator to line up sensitivities, apply a

steady tone (e.g slate on a mixing console). The 1

watt level is the point when indicator comes on, re g

ohms, (or 2 wafts for 4 ohm loads).

The amplilier is not damaged by running into clip-

ping, butyourspeakers may be. To maximisethe life

of your speakers, try to keep clipping infrequent.

/tu

Controls & Connectors 7

Rear Panel

Figure 3 shows layouts of the rear panels; the section

numberc refer to areas on the drawing. The functions of

the controls and indicators are as follows:

6. Balanced Input

A female 3 pin XLR connector is provided on each input:

Pin 1=Signal Ground

Pin 2 = Cold (inverting or reverse phase)

Pin 3 = Hot (non-inverting or in phase)

6b Level Control

(Contractor version only)

A rear panel mounted 21 position detented

potentiometer is provided on all Contractor models

for input level control on each channel.

6c Barrier Strip Input

A three terminal barrier strip connector is provided

for'hard wiring'signal input in permanent situa-

tions. This input is parallel with the input XLR.

7. Signal Ground Lift Switch

(C800 & C1200 only)

When this switch is engaged it disconnects signal

ground from the input connectors on both channels.

It is intended to be used to isolate earth loops (due

to different ground potentials between source equip-

ment and the amplifier), or stray magnetic field pick

up on the input ground/shield wiring. (lt does not

interrupt signal ground continuity on the strapping

connector). The amplifier should be turned off

before engaging this switch! Please read the

Hum Problemsintormation in the Operatlon section

of this manual-

8. Binding Post Outputs

Binding posts (banana jacks) are provided for

speaker output termination with banana plugs,

spade type lugs or bare wire. The red post is used

as positive and the black post is used as negative.

9. Mains Lead Connector I.E.C.

Your amplifier is supplied with a IEC mains lead

(power cord) appropriately rated for the mains sup-

ply voltage marked on the rear panel of your ampli-

fier. The wires in the mains lead are coloured in

accordance with the following code:

BROWN

BLUE = ACTIVE

= NEUTRAL

GREEN&YELLOW = EARTH

Your unit must always be earthed!

Note: 110V version are supplied with heavy duty

mains Iead.

10. Mains Fuses

M 205 fast blow type fuses are used in these ampli-

fiers. Fuses need to be replaced with the same type

and the value must be as follows:

C300/Opal1202lPA3 34

C600/Opal2802/PAO 64

c800 7A

c1200tPA8tPA12 10A

I l. Bridge Switch

Pushing this switch in engages the BRIDGED/MONO

mode of operation. ln this mode your amplilier will

only accept signal applied to channel A's input XLRs

and the level of both channels will be controlled by

channel A's attenuator. The output from channel B

will automatically be of the opposite polarity (re-

versed phase) and speaker termination should be

sourced from the red binding-post outputs. Please

rcad lhe Bridge Mode section of this manual.

CHA +VE Phase

CHB - VE Phase

Australian Monitor /tu

8 Controls & Connectors

Figure 3 Rear Panel Layouts

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3. Installation

Mains Lead Wiring

WARNING

Your amplifier must be earthed at all timesl

When you first receive your amplifier it may not have a

mains plug attached. You must ensure that an appropri-

ate plug is used. It must correspond with the amplifier's

current (ampere) requirements, and meet the approval of

your local energy authority.

The wires in the mains lead are coloured in accordance

with the following code:

GREEN&YELLOW=EARTH

Connect to the terminal marked with the letter E.

with the EARTH SYMBOL, or coloured GREEN.

BLUE = NEUTRAL

Conneci to the terminal marked with the letter N,

(or colored WHITE in USA and Canada,

or coloured BLACK in the United Kingdom).

BROWN = ACTIVE (LIVE)

Connect to the terminal marked with the letterA or L.

(or colored BLACK in USA and Canada,

or coloured RED in the United Kingdom).

Power Requirements

Ensure that your mains supply voltage is the same as the

rear panel mains voltage marker. Each model's power

consumption is as follows:

Mounting

Your amplifier is designed for standard 19'rack mount-

ing, and occupies 2 EIA rack units (3.5"). The mounting

centers are:

Vertical: 3.0'(76.2mm)

Horizontal: 18.2'to 18.6" (461.2mm to 473.8mm).

The slots in the mounting flange will accept boll diameters

up to 1/4" (6.35mm).

We recommend that you provide additional support for

the amolifier, especially if road use is planned, as the

amplifier's weight can bend some racks. This support can

be provided by secure shelving, support rails, or rear

panel support brackets.

Cooling

Allamplifiers are cooied by an axialfan which draws cool

airfrom the front of the unit and expels the heated airfrom

the side of the unit. The C800 & C'1200 amplifiers expei

the heated air from lhe rear of the unit. Standard units

offer speed control fans which are turned on when the

output level s above 2 watts into 4 ohms. and stay on

while the heatsink is hot. The C800 & C1200 offer two

speed fans which normally run at half speed, and switch

to full speed when the internai heatsink temperature

exceeds 60oC (128"F).

An unrestricted airflow into and out from the unit must be

provided. Any restriction of the air flow will cause heat to

build up within the unit and possibly force the unit into its

thermal shutdown mode.

110-120 Volt Models

C300/Opal1202lPA3

C600/Opal2802/PA6

c800/PA8

c1200tPA12

220-240 Volt Models

C300/Opal1202/PA3

C600/Opal2802/PA6

c800/PA8

c1200tPA12

Amps Watts Watts at

at idle full power

6 50 450

15 100 1000

15 120 1400

?0 160 2200

Amps

Watts Watts at

at idle full power

50 450

100 1000

120 1400

160 2200

Australian Monitor /tu

I10 Installation

Input Wiring

NOTE. lnput signal ground is not to bo used as a

safety ground (earth).

The input to your amplifier is a balanced 3-pin system and

requires allthree pins to be connected. Only high quality

twin-core shielded cable should be used.

XLR Inputs

When wiring for a balanced source the connector going

to the inputs of your amplifier should be wired as follows:

Pin 3 = HOT (non inverting)

Pin2=COLD(inverting)

Pin 1=Ground/Shield

When wiring from an unbalanced source you must

ensure that pin 2 is connected to pin 1 (input ground),

either by linking the pins in the input connector or at the

source equipment output wiring. Therefore when wiring

for an unbalanced source:

Pin 3 = Hot (in phase with the amplifier's output)

Pin 2 = Connect to pin 1 (Ground/Shield)

Pin 1 = Ground/Shield

Barrier Strip Inputs

The barrier strip connector on the Contraclor Series

models is wired in parallel with the female XLR input

connector as follows:

Pin 3 = +ve (non-inverting)

Pin2=-ve(inverting)

Pin 1 = GND (input signal ground)

NoTE. Some in-line XLR connectors have a termination

lug that connects directly to the chassis ofthe connector.

Do not link this lug to pin 1 at the amplifier's inpui as it will

defeat the amplifier's input grounding scheme.

This lug is often referred to as a'drain'and is used to

provide a circuit to the chassis (not signal ground) for

shielding purposes. This is usefulwhen further isolation of

signal grounds is required between source and destina-

tion, eg to help in reducing earth loop noise, or noise

induced into signal grounds from stray magnetic fields.

OutputWiring

When wiring to your speakers always use the largest

gauge wire your connector will accept. The longer the

speaker lead the greater the losses will be, resulting in

reduced power and less damping at the load. We recom-

mend using a heavy duty two core flex (four core flex if bi-

amping), 10 to 12 gauge (2mm'?to 2.smm'?or 50/0.25 or

equivalent) as a minimum.

Binding Post Outputs

When terminating to the 4 mm binding post (banana jack)

output connectors, banana plugs or spade type lugs can

be used. The red terminal is positive and the black

terminal is negative.

lf running in BRIDGE mode, only the red binding posts are

used. Channel A provides the positive output to the load

and channel B provides the negative output to the load.

'Speakon' Outputs

(C800 & C 1200 only)

When using the NEUTRIK 'Speakon' (NL4MP) connector

for speaker output, use only the mating NEUTRIK NL4FC

in-line connector. This connector is designed so that both

channels can be fed from a single connector.

Two 'Speakon' connectors are provided on the other

amplifier. The channel A 'Speakon' actually carries both

channel A & channel B outputs (see figure 4: Speaker

Wiring Diagrams). The channel B 'Speakon' carries only

the channel B output. This gives you options of connect-

ing outputs separately or together through a single or two

connectors-

/tu

Dieses Handbuch passt für folgende Modelle

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