AUSTRALIAN MONITOR IS1200 Bedienungsanleitung

Clever Features, Contractor Friendly

IS600

IS1200

Stereo Professional Audio Amplifiers

Installation

Operation Manual

Introduction

The Australian Monitor Installation Series IS600 & IS1200 are 2 RU stereo power

amplifiers. The IS600 delivers 300 watts per channel @ 4 ohms & the IS1200

delivers 600 watts per channel @ 4 ohms. Designed for permanent

installations where high quality audio reproduction is required on a small

budget, the IS series deliver the sound quality & features contractors require.

The IS series continues the Australian Monitor tradition of delivering an

amplifier packed with clever features at a contractor friendly price.

Features

•Custom 2RU design.

•High efficiency toroidal mains transformer.

•Binding post and 4 pole speaker output connection.

•Stereo or Parallel operation.

•Balanced inputs and buffered attenuators.

•Signal Present indication.

•Output clip indication.

•Efficient front to back cooling.

•Twin speed axial fans.

•Thermal fault indication.

•Signal ground lift switch.

Protection Features

•Short circuit protection.

•Overload protection.

•Soft Start.

•Thermal protection.

Contents

Page

1. Introduction 2

2. Controls, Connectors & Indicators 5

2.1 Front Panel 5

2.2 Rear Panel 7

3.Installation 9

4.Operation 11

5. Maintenance 14

6. Specifications 15

IMPORTANT!

Please read carefully.

This operation manual contains important information regarding safety precautions,

installation, performance, operation and maintenance of your IS-Series power amplifier. You

should familiarize yourself with the contents of this manual before operating your amplifier

The user should not attempt to service the amplifier. Only qualified and knowledgeable

personnel familiar with the internal workings of the amplifier should attempt any repair,

servicing or authorized modification to the amplifier. The amplifier does not contain any parts

which the user can service or re-use in this or any other product.

If you are in need of special assistance and the information you require is outside the scope

of this manual, please contact your nearest service agent or Australian Monitor direct:

THE TECHNICAL OFFICER

AUSTRALIAN MONITOR

C/- AUDIO TELEX COMMUNICATIONS PTY LTD

PRIVATE BAG 149,

SILVERWATER. N.S.W. 1811

AUSTRALIA.

Phone Fax

Australia (02) 9647-1411 (02) 9748-2537

International 61-2-9647-1411 61-2-9748-2537

Email [email protected]

Internet www.australianmonitor.com.au

Front Panel

1 Attenuator

There are 2 level controls on all IS models. Each control is labelled for the

channel which it controls. 0dB indicates minimum attenuation.

2 Clip Indicator

This LED displays the status of the output stage and displays two levels of

operation.

These levels are:

Below clip level (unlit)

Clipping & above (red)

The LED will change to red once the output exceeds the clipping point of

the amplifier’s output stage. The threshold is referred to the amplifier supply

rails and alters with changes in the mains supply, changes in the load and

duty cycle fluctuations.

The attack and decay time (ballistics) of the status circuit are those of a

Peak Programme Meter (P.P.M.)

1 2 4

5 6

NOTE: The amplifier is not damaged by running into clipping, but speakers

may be. To maximise the life of your speakers, try to keep clipping

infrequent.

3 Power Switch

This switches AC power to the amplifier. Press the switch to up for power on

and down for power off. At start-up (turn-on), the input to the amplifier is

muted for approximately two seconds.

4 Protect Indicator

This red LED will illuminate when thermal shutdown occurs.

5 Active Indicator

This LED will illuminate blue and indicates that the amplifier is ON and

receiving AC mains power.

6 Signal Indicator.

This LED displays the status of the output stage and varies in intensity in

proportion to the output signal level.

Rear Panel

7 Balanced XLR Input

A female 3-pin XLR type connector is provided for each input:

Pin 1 = Signal Ground;

Pin 2 = Hot (non-inverting or in phase);

Pin 3 = Cold (inverting or reverse phase).

8 Balanced 6.35mm TRS Input

A female 6.35mm TRS connector is provided for each input.

Tip = Hot (non-inverting or in phase);

Ring = Cold (inverting or reverse phase);

Sleeve = Signal Ground.

9Input Sensitivity Switch

This switch allows the amplifiers input sensitivity to be correctly matched to

the equipment providing the amplifiers input signal. See the Operation

section (page 12) for more details.

10 Parallel/Stereo Switch

This switch determines whether channels A & B are receiving separate signals

(i.e. Operating in stereo mode) or whether the input signal from channel A

is being fed through to channel B.

78910 11

14 15

Note: This is not Bridge mode.

11 Ground Lift Switch

When this switch is engaged, it disconnects signal ground from the input

connectors on both channels. It is intended to be used when “hum” is

caused by earth loops (due to different ground potentials between source

equipment and the amplifier) or stray magnetic field pick up on the input

ground/shield wiring. The amplifier should be turned off before engaging this

switch!

12 Speaker Output Connector

A 4 pole speaker connector is provided as an additional speaker output. This

standard of loudspeaker-to-amplifier connection allows access to both

channels of the amplifier via the one connector for bi-amp applications.

Channel-A is considered the dominant channel and has both channels wired

to the speaker connector. See the installation section of this manual for

detailed information on speaker connector wiring.

13 Mains Fuse

The IS600 is fitted with a 8 amp slow blow fuse & the IS1200 is fitted with a 15

amp slow blow fuse.

14 Mains Connection

Your amplifier is fitted with an internationally recognised IEC mains inlet

connector. Please ensure that the connecting mains lead for use with the IEC

connector is of an approved type and is of sufficient current carrying

capacity.

NOTE: Your unit must always be earthed!

15 Binding Post Outputs

Touch-proof binding posts (banana jacks) are provided for speaker output

termination with banana plugs or bare wire. The red post is used as positive

and the black post is used as negative.

Installation

Power Requirements

Ensure that your mains voltage is the same as the rear panel mains voltage

marker (+/- 10%).

Mounting

Your amplifier is designed for standard 19” rack mounting and occupies 2 EIA

rack units.

Cooling

Each channel of your IS Series amplifier is cooled by an axial fan which draws

cool air from the front of the amplifier and expels heated air out the rear of

the amplifier. These amplifiers include two-speed fans which normally run at

half speed, switching to full speed when the internal heatsink temperature

exceeds 500C. An unrestricted airflow into and out of the amplifier must be

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

amplifier and possibly force the amplifier into its thermal shutdown mode. If

the amplifiers are to be operated in an environment where the airflow is

restricted, such as sealed racks, cooling should be supplemented by extra

cooling fans to evacuate the heated air and aid the flow of cool air through

the amplifier.

Input Wiring

IMPORTANT

Do not directly connect pin 1 on the amplifier’s input XLR or TRS jack, to the

amplifier’s chassis, speaker ground or power ground!

NOTE: Input signal ground is not to be used as a safety ground (earth).

The input to your amplifier is a balanced 3-pin configuration and requires all

three pins to be connected. Only high quality twin-core shielded cable

should be used. When wiring for a balanced source, the connector going to

the input of your amplifier should be wired as follows:

Pin 1 = GROUND / SHIELD.

Pin 2 = HOT (In Phase - non inverting).

Pin 3 = COLD (Reverse Phase - inverting).

When wiring for an unbalanced source you must ensure that pin 3 is

connected to pin 1 (input ground), either by linking the pins in the input

connector or by the source equipment’s output wiring.

When wiring for an unbalanced source:

Pin 1 = GROUND/SHIELD

Pin 2 = HOT (in phase with the amplifier’s output),

Pin 3 = GROUND/SHIELD (joins to pin 1).

NOTE:

In-line XLR connectors often have a termination lug that connects directly to

the chassis of the connector. Do not link this lug to pin 1 at the amplifier’s

input 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 termination to the chassis for

shielding purposes when a floating signal ground is required between the

source and destination, or when disconnecting the signal ground is required

to reduce earth loop noise, or noise induced into signal grounds from stray

magnetic fields.

Output Wiring

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

recommend using a heavy-duty, two core flex (four core flex if bi-amping) 10

to 12 gauge (2mm2to 2.5mm2or 50/0.25 or equivalent) as a minimum.

Andere Handbücher für IS1200

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