Australian Monitor. SY 6125, SY 400, SY 400V, SY 800V, SY 1200 User Manual

Professional Audio Amplifier

SY 400 SY 800 SY 1200 SY 1600 SY 400V SY 800V SY 6125 SY 4200

Operation Manual

IMPORTANT!

Please read carefully.

This operation manual contains important information regarding safety precautions, installation, performance, operation and maintenance of your Synergy-Series power amplifier. You should familiarize yourself with the contents of this manual before operating your amplifier.

Safety Precautions

and Labelling

The rear panel of this amplifier has a number of markings and internationally recognized symbols relating to the hazards and precautions that should be taken when operating MAINS connected equipment.

The presence of a LIGHTNING FLASH with an arrowhead contained within the boundaries of an equilateral triangle is intended to alert the user that dangerous uninsulated voltages may exist within the amplifiers 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:

!CAUTION!

RISK OF ELECTRICAL SHOCK

DO NOT OPEN

The presence of an EXCLAMATION MARK contained within the boundaries of an equilateral triangle is intended to alert the user that there is important operating and maintenance literature that accompanies the amplifier.

!WARNING!

DO NOT EXPOSE TO EITHER

RAIN OR MOISTURE

REFER SERVICING TO

QUALIFIED PERSONNEL.

NO USER SERVICEABLE

PARTS INSIDE.

The user should not attempt to service the amplifier. Only qualified and knowledgeable personnel familiar with the internal workings of the unit should attempt any repair, servicing or authorized modification to the unit. The unit 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
Local	[phone]	[phone]
International	61-2-9647-1411	61-2-9748-2537
Email	[e-mail]
Internet	www.australianmonitor.com.au

The amplifier should not be operated in a situation where it may encounter the entry of water, rain, or any fluids. To expose the unit to the above conditions may make the operation of the unit hazardous and increase the risk of electrical shock.

Rev 2 16/06/04

Rev 3 26/06/04

Rev 4 28/06/04

Rev B 28/06/04

Features:

Custom designed, 2RU heavy duty steel chassis.

Open, modular construction for ease of servicing.

Symmetrical layout - even weight distribution.

High current power supply.

High efficiency toroidal mains transformer.

Binding post and 4 pole speaker output connection (no 4 pole speaker outputs on SY400V, SY800V, SY4200 & SY6125).

Stereo or bridged operation (no bridging available on SY400V & SY800V).

Input signal strapping (loop through) connectors (not available on SY6125).

Balanced inputs and buffered attenuators.

1 Watt output indication (2.828 volts).

1 dB below output clip indication.

Efficient front to back cooling.

Dual, twin speed axial fans.

Multi-role output fault indication.

Front carry handles. Rear rack mount ears.

Signal ground lift switch.

Built in limiter circuit.

High-quality, close-tolerance components throughout.

Protection Features

Suppression of inrush current at mains turn-on.

Input muting at turn-on.

Input overvoltage protection.

Radio-frequency interference suppression.

Short-circuit protection and indication.

High overload mains fuse.

Internal, independent DC supply rail fuses.

Layout, grounding, decoupling and componentry have been optimized to provide the user with stability, reliability and longevity.

Australian Monitor

Contents

		Page
1.	Introduction	5
2.	Controls, Connectors and Indicators	6
	2.1 Front Panel	7
	2.2 Rear Panel	11
3.	Installation	14
4.	Operation	16
5.	Maintenance	18
6.	Specification	20

List of Illustrations

	Page
Figure 1. Block Diagram	5
Figure 2. Front Panel Layout(SY6125, SY1200, SY4200)	6
Figure 3. Rear Panel Layout (SY400, SY1600)	9
Figure 4. Rear Panel Layout (SY6125, SY4200, SY400V)	10
Figure 5.Top Lid Layout (SY6125, SY4200)	13
Figure 6. Speaker Connector Wiring	15

Introduction 5

1. Introduction

Congratulations on choosing Australian Monitor for your professional amplification requirements.

The design of our Synergy-Series Audio Power Amplifiers embraces all the aspects of a well designed amplifier. The visual design, mechanical, electrical and sonic parameters, along with our dedicated manufacturing process, have all been optimized to provide a professional tool that exhibits quality, reliability and longevity.

The Synergy-Series amplifiers are 2 unit (3.5") high, 19" wide, rack mountable units.

Each channel of the amplifier comprises a balanced active input with a buffered attenuator driving a differential class A drive stage which in turn drives a fan-cooled, class AB, BJT output stage configured as an emitter follower. The amplifier operates from a high current-capable linear power supply.

These amplifiers have been specifically designed to deliver their high power output with minimal distortion, and provide the critical degree of control required by your speakers, at high duty cycles for extended periods.

Figure 1 Amplifier Block Diagram

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6Controls & Connectors

2.Controls, Connectors & Indicators

STATUS

STATUS

C D

A B

MAX

D-LEVEL MIN OVERLOAD MAX

C-LEVEL

MIN

MAX

LEVELBMIN OVERLOAD MAX

A-LEVEL

MIN

POWER

FAULT

THERMAL

SY 4200

Australian Monitor

STATUS

STATUS

STATUS

E F

C D

A B

MAX

F-LEVEL MIN OVERLOAD MAX

LEVEL E-

MIN

MAX

D-LEVEL MIN OVERLOAD MAX

C-LEVEL

MIN

MAX

B-LEVEL

MIN

OVERLOAD

MAX

A-LEVEL

MIN

POWER

FAULT

THERMAL

SY 6125

F i g u r e 2 F r o n t P a n e l L a y o u t ( l e ft t o r i g h t - S Y 4 2 0 0 , S Y 1 2 0 0 , SY6125)

Front Panel

The Synergy Series differ only slightly across all models and all share the same features on their front panels.

Figure 1 shows the panel layout of three Synergy amplifiers, SY4200, SY1200 & SY6125. The SY1200 looks the same as the SY400, SY800, SY1600, SY400V & SY800V. The functions of the controls and indicators are as follows:

Controls & Connectors 7

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. Clipping on the SY400V & SY800V may cause speaker transformers to saturate causing the amplifier to shut down. For this reason the voltage limiters should always be engaged on the SY400V & SY800V (see Rear Panel-Limiter Switch on page 11).

1 Attenuator

Level control for your amplifier is provided by a potentiometer on the front panel and indicates gain. There are 2 controls on all Synergy models except the SY4200 which has 4 controls and the SY6125 which has 6 controls. Each control is labelled for the channel which it controls.

2 Status Indicator

This is a dual colour LED which displays the status of the output stage and displays three levels of operation.

These levels are:
Below 1 watt	(unlit)
1 watt and above	(green)
1dB below actual clipping	(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). For the SY400V & SY800V the output voltage is 10 volts & 7.070 volts (2 watts re 50ohm & 25ohm) respectively

The LED will change to red once the output exceeds the -1dB point before actual clipping of the amplifier’s output stage. The threshold of the - 1dB point 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 Metre (P.P.M.)

If using this indicator to line up sensitivities, apply a steady state tone (e.g. slate on a mixing console). The 1 watt level is the mid-point between the indicator illuminating and extinguishing green.

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3 Overload Indicator

This amber LED will illuminate when an overload condition exists.

Overload conditions can occur under extreme operating conditions such as:

-complex or very low loads

-over driving the amplifier

-speaker transformer saturation

It should be noted that the minimum load for the amplifier is 4 ohms per channel (8 ohm bridged) except the SY400V which has a minimum load of 50 ohms per channel and the SY800V which has a minimum load of 25 ohms per channel. (The SY400V & SY800V cannot be bridged).

If an overload occurs, the amplifier will shut down and mute all outputs except the SY6125 & SY4200 which will only mute the channel with the overload. If the overload is only transitory, then the amplifier will resume normal operation after approximately 7 secs. If the fault is continuous, then the amplifier will remain muted.

4 Power Switch

Press the switch to up for power on ( I )and down for power off ( 0 ). At start-up (turn-on), the input to the amplifier is muted for approximately two seconds.

5 Thermal Indicator

In the advent of a thermal overload, this LED will turn red, indicating that the internal operating temperature of one or both amplifier channels has exceeded a safe level of operation and the channels will be automatically muted. The fans will continue to run and once the effected channel/s have had a cool-down period, they will un-mute and return to normal operation.

8 Controls & Connectors

NOTE: You should always ensure that the fan grille is kept clean and free from the build up of dust and lint. This will ensure longer operation of your amplifier and reduce the possibility of it prematurely going into thermal shutdown mode. See the section “Installation - Cooling “ on page 14 for recommended cooling procedures.

6 On Indicator

This LED will illuminate blue and indicates that the amplifier is on and receiving mains power.

7 Fault Indicator

This red LED indicates a significant problem with the amplifier and the amplifier should be returned to an authorised technician for servicing.