AUSTRALIAN MONITOR Synergy SY400 User manual

SY 400
SY 800
SY 1200
SY 1600
Operation Manual
Professional Audio Amplifier

Australian Monitor
The rear panel of the unit has a number of markings
and internationally recognized symbols related to
the hazards and precautions that should be taken
whenoperatingMAINSconnectedequipment.
The presence of a LIGHTNING FLASH with an
arrowhead contained within the boundaries of an
equilateral triangle is intended to alert the user that
dangerousuninsulatedvoltagesmayexistwithinthe
unit's enclosure. These voltages may be of a
sufficient magnitude as to constitute the risk of an
electricalshock.
Thissymbolisreinforcedwiththetext:
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
accompaniestheunit.
The unit 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
increasetheriskofelectricalshock.
Features:
>Custom designed, 2RU heavy duty steel
chassis.
>Open modular construction for ease of servicing.
>Symmetrical layout - even weight distribution.
>Well-regulating, high current power supply.
>High efficiency toroidal mains transformer.
>Binding post and 4 pole speaker output
connection.
>Stereo or bridged / mono operation.
>Input signal strapping (loop through) connectors.
>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.
>Plug in signal modifiers (optional).
>Signal ground lift switch.
>Built in limiter circuit.
>High-quality, close-tolerance components
throughout.
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
ofthismanualbeforeoperatingyouramplifier.
Safety Precautions
and Labelling
!CAUTION!
RISK OF ELECTRICAL SHOCK
DO NOT OPEN
!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 unit. 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
orAustralianMonitordirect:
THE TECHNICAL OFFICER
AUSTRALIAN MONITOR
C/- AUDIO TELEX COMMUNICATIONS PTY LTD
PRIVATE BAG 149,
SILVERWATER. N.S.W. 1811
AUSTRALIA.
Phone Fax
Local [phone] (02)9748-2537
International 61-2-9647-1411 61-2-9748-2537
Email [email protected]
Internet www.australianmonitor.com.au
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.
>Highoverloadmainsfuse.
>Internal,independentDCsupplyrailfuses.
>Layout, grounding, decoupling and componentry
have been optimized to provide the user with
stability,reliabilityandlongevity.

Australian Monitor
The rear panel of the unit has a number of markings
and internationally recognized symbols related to
the hazards and precautions that should be taken
whenoperatingMAINSconnectedequipment.
The presence of a LIGHTNING FLASH with an
arrowhead contained within the boundaries of an
equilateral triangle is intended to alert the user that
dangerousuninsulatedvoltagesmayexistwithinthe
unit's enclosure. These voltages may be of a
sufficient magnitude as to constitute the risk of an
electricalshock.
Thissymbolisreinforcedwiththetext:
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
accompaniestheunit.
The unit 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
increasetheriskofelectricalshock.
Features:
>Custom designed, 2RU heavy duty steel
chassis.
>Open modular construction for ease of servicing.
>Symmetrical layout - even weight distribution.
>Well-regulating, high current power supply.
>High efficiency toroidal mains transformer.
>Binding post and 4 pole speaker output
connection.
>Stereo or bridged / mono operation.
>Input signal strapping (loop through) connectors.
>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.
>Plug in signal modifiers (optional).
>Signal ground lift switch.
>Built in limiter circuit.
>High-quality, close-tolerance components
throughout.
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
ofthismanualbeforeoperatingyouramplifier.
Safety Precautions
and Labelling
!CAUTION!
RISK OF ELECTRICAL SHOCK
DO NOT OPEN
!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 unit. 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
orAustralianMonitordirect:
THE TECHNICAL OFFICER
AUSTRALIAN MONITOR
C/- AUDIO TELEX COMMUNICATIONS PTY LTD
PRIVATE BAG 149,
SILVERWATER. N.S.W. 1811
AUSTRALIA.
Phone Fax
Local [phone] (02)9748-2537
International 61-2-9647-1411 61-2-9748-2537
Email [email protected]
Internet www.australianmonitor.com.au
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.
>Highoverloadmainsfuse.
>Internal,independentDCsupplyrailfuses.
>Layout, grounding, decoupling and componentry
have been optimized to provide the user with
stability,reliabilityandlongevity.

Australian Monitor
Contents Page
1. Introduction 5
2. Controls,ConnectorsandIndicators 6
2.1FrontPanel 7
2.2RearPanel 9
3. Installation 10
4. Operation 12
5. Maintenance 14
6. Warranty 15
7. Specification 16
List of Illustrations Page
Figure1.BlockDiagram 5
Figure2.FrontPanelLayout 6
Figure3.RearPanelLayout 8
Figure4.SpeakerConnectorWiring 11
1. Introduction
Congratulations on choosing Australian Monitor for
yourprofessionalamplificationrequirements.
The design of your Synergy-Series Audio Power
Amplifiersembracealltheaspectsofawelldesigned
unit. 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,
reliabilityandlongevity.
The Synergy-Series amplifiers are 2 unit (3.5") tall, 19"
widerackmountableunits.
Each channel of the amplifier comprises a balanced
active input with a buffered attenuator driving a
differential class Adrive stage which in turn drives a
fan-cooled,classAB,BJToutputstageconfiguredas
an emmiter follower. The unit operates from a high
current-capablelinearpowersupply.
These units 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
extendedperiods.
Figure 1 Amplifier Block Diagram
Introduction 5

Australian Monitor
Contents Page
1. Introduction 5
2. Controls,ConnectorsandIndicators 6
2.1FrontPanel 7
2.2RearPanel 9
3. Installation 10
4. Operation 12
5. Maintenance 14
6. Warranty 15
7. Specification 16
List of Illustrations Page
Figure1.BlockDiagram 5
Figure2.FrontPanelLayout 6
Figure3.RearPanelLayout 8
Figure4.SpeakerConnectorWiring 11
1. Introduction
Congratulations on choosing Australian Monitor for
yourprofessionalamplificationrequirements.
The design of your Synergy-Series Audio Power
Amplifiersembracealltheaspectsofawelldesigned
unit. 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,
reliabilityandlongevity.
The Synergy-Series amplifiers are 2 unit (3.5") tall, 19"
widerackmountableunits.
Each channel of the amplifier comprises a balanced
active input with a buffered attenuator driving a
differential class Adrive stage which in turn drives a
fan-cooled,classAB,BJToutputstageconfiguredas
an emmiter follower. The unit operates from a high
current-capablelinearpowersupply.
These units 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
extendedperiods.
Figure 1 Amplifier Block Diagram
Introduction 5

Australian Monitor
Front Panel
The Synergy Series models have identical front panel
layouts.
Figure 1 shows the panel layout of the Synergy Series.
The functions of the controls and indicators are as
follows:
1 Attenuator
Level control for your amplifier is provided by a
potentiometer on the front panel and indicates
gain.
2 Status Indicator
Thisisa dual color LED which displaysthestatus
of the output stage and displays three levels of
operation.
Theselevelsare:
Below1watt (unlit)
1wattandabove (green)
1dBbelowactualclipping (red)
The LED will turn green once the output voltage
exceeds 2.828 volts (1 watt re 8 ohms or 2 watts
re4ohms).
The LED will change to red once the output
exceeds the -1dB point before actual clipping of
theamplifier’soutputstage.Thethresholdofthe-
1dB point is referred to the amplifier supply rails
and alters with changes in the mains supply,
changesintheloadanddutycyclefluctuations.
The attack and decay time (ballistics), of the
status circuit are those of a Peak Programme
Meter(P.P.M.)
Ifusing 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
extinguishinggreen.
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 Overload Indicator
Thisamber LED will illuminate when anoverload
conditionexists.
Overload conditions can occur under extreme
operatingconditionssuchas:
-complexorverylowloads
-overdrivingtheamplifier
It should be noted that the minimum load for the
amplifieris4ohmsperchannel(8ohmbridged).
If an overload occurs the amplifier will shut down
and mute both outputs. If the overload is only
transitory then the amplifier will resume normal
operationafterapproximately7secs.Ifthefaultis
continuousthentheamplifierwillremainmuted.
4 PowerSwitch
Presstheswitchto upforpoweron(I)anddown
forpower off (0).Atstart-up(turn-on)theinputto
the amplifier is muted for approximately two
seconds.
5 ThermalIndicator
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-muteandreturntonormaloperation.
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
10forrecommendedcoolingprocedures.
6 On Indicator
This LED will illuminate blue and indicates that
theamplifierisonandreceivingmainspower.
7 Fault Indicator
This red LED indicates a significant problem with
theamplifier and the amplifier should be returned
toanauthorisedtechnicianforservicing.
Controls & Connectors 7
2.Controls,
Connectors
&Indicators
Figure 2 Front Panel Layout
6 Controls & Connectors

Australian Monitor
Front Panel
The Synergy Series models have identical front panel
layouts.
Figure 1 shows the panel layout of the Synergy Series.
The functions of the controls and indicators are as
follows:
1 Attenuator
Level control for your amplifier is provided by a
potentiometer on the front panel and indicates
gain.
2 Status Indicator
Thisisa dual color LED which displaysthestatus
of the output stage and displays three levels of
operation.
Theselevelsare:
Below1watt (unlit)
1wattandabove (green)
1dBbelowactualclipping (red)
The LED will turn green once the output voltage
exceeds 2.828 volts (1 watt re 8 ohms or 2 watts
re4ohms).
The LED will change to red once the output
exceeds the -1dB point before actual clipping of
theamplifier’soutputstage.Thethresholdofthe-
1dB point is referred to the amplifier supply rails
and alters with changes in the mains supply,
changesintheloadanddutycyclefluctuations.
The attack and decay time (ballistics), of the
status circuit are those of a Peak Programme
Meter(P.P.M.)
Ifusing 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
extinguishinggreen.
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 Overload Indicator
Thisamber LED will illuminate when anoverload
conditionexists.
Overload conditions can occur under extreme
operatingconditionssuchas:
-complexorverylowloads
-overdrivingtheamplifier
It should be noted that the minimum load for the
amplifieris4ohmsperchannel(8ohmbridged).
If an overload occurs the amplifier will shut down
and mute both outputs. If the overload is only
transitory then the amplifier will resume normal
operationafterapproximately7secs.Ifthefaultis
continuousthentheamplifierwillremainmuted.
4 PowerSwitch
Presstheswitchto upforpoweron(I)anddown
forpower off (0).Atstart-up(turn-on)theinputto
the amplifier is muted for approximately two
seconds.
5 ThermalIndicator
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-muteandreturntonormaloperation.
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
10forrecommendedcoolingprocedures.
6 On Indicator
This LED will illuminate blue and indicates that
theamplifierisonandreceivingmainspower.
7 Fault Indicator
This red LED indicates a significant problem with
theamplifier and the amplifier should be returned
toanauthorisedtechnicianforservicing.
Controls & Connectors 7
2.Controls,
Connectors
&Indicators
Figure 2 Front Panel Layout
6 Controls & Connectors

Australian Monitor
Rear Panel
8 Balanced Input
Afemale 3-pinXLRtypeconnectoris providedon
eachinput:
Pin1=SignalGround;
Pin2=Hot(non-invertingorinphase);
Pin3=Cold(invertingorreversephase).
8a Signal Strapping
A male 3-pin XLR type connector is provided and
wired in parallel with the female input XLR for
strapping/loopingsignalbetweenamplifiers.
9 Signal Ground Lift Switch
Whenthisswitchisengageditdisconnectssignal
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. (It does not interrupt
signal ground continuity on the strapping
connector). The amplifier should be turned off
beforeengagingthisswitch!
10 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. For bridge connection use only the red
posts.
10a Speaker Output Connector
The 4 pole speaker connector is provided as an
additional speaker output. This emerging
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.
11 Mains Connection
Your amplifier is fitted with either an
internationally recognised IEC mains inlet
connector (SY400, SY800, SY1200) or has a
internallyconnectedmainslead(SY1600).
Please ensure that the connecting mains lead for
usewiththeIEC connectorisofanapprovedtype
andisofsufficientcurrentcarryingability.
NOTE:Yourunitmustalwaysbeearthed!
12 Mains Fuse or Circuit Breaker
Either a 20mm x 5mm fuse drawer is provided
within the housing of the IEC mains connector
(SY400, SY800, SY1200) or the amplifier is fitted
witharesettablecircuitbreaker(SY1600).
Fuse:
When you recieve your amplifier it will have a
working fuse and a spare fuse inside the fuse
drawer. The drawer can only be opened once the
mains lead is removed from the connector. The
fuse is provided to protect both the mains and
your amplifier as well as reducing the degree of
damageifaninternalfaultexists.
When replacing the fuse, replace with an anti-
surge (slow blow) type of the current rating
indicated on the back panel above the fuse
holder.
Warranty does not cover a blown fuse or any
resulting damage due to an incorrect fuse rating
ortype.
Breaker:
If the circuit breaker trips allow 3 mins for the
contacts to reset thermally before pushing the
resetbuttontoresetitmechanically.
13 Bridge Switch
Pushing this switch in engages the
BRIDGED/MONO mode of operation. In this
mode your amplifier will only accept signal
appliedto channel A’s inputXLRs and the levelof
both channels will be controlled by channel A’s
attenuator. The output from channel B will
automatically be of the opposite polarity
(reversedphase)andspeakerterminationshould
be sourced from the red binding-post outputs.
Alternatively, the speaker could be connected to
poles 1+ & 2+ of the 4 pole speaker connector
(seeInstallation-OutputWiringonpage11).
14LimiterSwitch
Pushing this switch in engages the clip limiter
circuitry. The threshold level is reference to the
supply rail and the output voltage is sampled
allowingtrueclipdetectionandlimiting.
Controls & Connectors 9
Figure3 RearPanelLayout
8 Controls & Connectors

Australian Monitor
Rear Panel
8 Balanced Input
Afemale 3-pinXLRtypeconnectoris providedon
eachinput:
Pin1=SignalGround;
Pin2=Hot(non-invertingorinphase);
Pin3=Cold(invertingorreversephase).
8a Signal Strapping
A male 3-pin XLR type connector is provided and
wired in parallel with the female input XLR for
strapping/loopingsignalbetweenamplifiers.
9 Signal Ground Lift Switch
Whenthisswitchisengageditdisconnectssignal
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. (It does not interrupt
signal ground continuity on the strapping
connector). The amplifier should be turned off
beforeengagingthisswitch!
10 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. For bridge connection use only the red
posts.
10a Speaker Output Connector
The 4 pole speaker connector is provided as an
additional speaker output. This emerging
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.
11 Mains Connection
Your amplifier is fitted with either an
internationally recognised IEC mains inlet
connector (SY400, SY800, SY1200) or has a
internallyconnectedmainslead(SY1600).
Please ensure that the connecting mains lead for
usewiththeIEC connectorisofanapprovedtype
andisofsufficientcurrentcarryingability.
NOTE:Yourunitmustalwaysbeearthed!
12 Mains Fuse or Circuit Breaker
Either a 20mm x 5mm fuse drawer is provided
within the housing of the IEC mains connector
(SY400, SY800, SY1200) or the amplifier is fitted
witharesettablecircuitbreaker(SY1600).
Fuse:
When you recieve your amplifier it will have a
working fuse and a spare fuse inside the fuse
drawer. The drawer can only be opened once the
mains lead is removed from the connector. The
fuse is provided to protect both the mains and
your amplifier as well as reducing the degree of
damageifaninternalfaultexists.
When replacing the fuse, replace with an anti-
surge (slow blow) type of the current rating
indicated on the back panel above the fuse
holder.
Warranty does not cover a blown fuse or any
resulting damage due to an incorrect fuse rating
ortype.
Breaker:
If the circuit breaker trips allow 3 mins for the
contacts to reset thermally before pushing the
resetbuttontoresetitmechanically.
13 Bridge Switch
Pushing this switch in engages the
BRIDGED/MONO mode of operation. In this
mode your amplifier will only accept signal
appliedto channel A’s input XLRs and the levelof
both channels will be controlled by channel A’s
attenuator. The output from channel B will
automatically be of the opposite polarity
(reversedphase)andspeakerterminationshould
be sourced from the red binding-post outputs.
Alternatively, the speaker could be connected to
poles 1+ & 2+ of the 4 pole speaker connector
(seeInstallation-OutputWiringonpage11).
14LimiterSwitch
Pushing this switch in engages the clip limiter
circuitry. The threshold level is reference to the
supply rail and the output voltage is sampled
allowingtrueclipdetectionandlimiting.
Controls & Connectors 9
Figure3 RearPanelLayout
8 Controls & Connectors

Australian Monitor
Installation 11
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
2
flex(fourcoreflexifbi-amping)10to12gauge(2mm
2
to2.5mm or50/0.25orequivalent)asaminimum.
Binding Post Outputs
When terminating to the 4 mm binding post (banana
jack) output connectors, banana plugs or bare wires
can be used. The red terminal is positive and the
blackterminalisnegative(ground).
If 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
negativeoutputtotheload.
Speaker Outputs
When using the 4 pole speaker connector for
speaker output, use only the mating 4 pole in-line
connector. This connector is designed so that both
channelscanbefedfromasingleconnector.
Two speaker connectors are provided on the
amplifier.
The "Channel A" speaker connector actually carries
both channel A & channel B outputs (see Figure 4:
SpeakerConnectorWiringDiagrams).
The "Channel B" speaker connector carries the
ChannelBoutputonly.
This arrangement allows you the option of
connecting to the outputs separately or together.
Connecting through a single connector has the
advantage of minimising connections, preserving
phasing and simplified channel allocation, which is
particularly important when bi-amping or in bridge
mode.
IMPORTANT
Do not overload your amplifier by connecting the
channelBoutputtwice!
Channel A is used as the “dominant” channel and
when sourcing a dual output from Channel A the
followingstandardshouldbeused:
ChannelA=LeftorLowFrequencies.
ChannelB=RightorHighFrequencies.
Wheninbridgemode:
Pin1+=BridgeOutputPositive
Pin2+=BridgeOutputNegative.
Figure4.Speaker ConnectorWiringDiagram
3. Installation
Power Requirements
Power consumption for your model of the Synergy
Series amplifier is indicated on the rear panel for
maximumoutput.
Ensure that your mains voltage is the same as the
rearpanelmainsvoltagemarker(+/-10%).
Mounting
Your amplifier is designed for standard 19" rack
mounting and occupies 2 EIA rack units (3.5"). The
mountingcentresare:
Vertical: 3.0"(76.2mm)
Horizontal:18.2"(461.2mm)to18.7"(473.8mm).
The slots in the mounting flange will accept bolt
diametersupto1/4"(6.35mm).
We recommend that you provide additional support
for the amplifier, especially if road use is planned, as
the weight can bend some racks otherwise. This
supportcanbeprovidedbysecureshelving,support
railsorarearrackmountingstriptomatchupwiththe
rear rack mount ears provided on your Synergy Series
amplifier.
Cooling
Eachchannelof your SynergySeriesamplifieris cooled
by an axial fan which draws cool air from the front of
theunitand expelstheheatedair fromtherearof the
unit. These units offer two speed fans which run at
half speed, switching to full speed when the internal
0 0
heatsinktemperatureexceeds60C(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
forcetheunitintoitsthermalshutdownmode.
If the units are to be operated in an environment
where the airflow is restricted such as sealed racks,
thecoolingshouldbe supplementedbyextracooling
fans to evacuate the heated air and aid the flow of
coolairthroughtheunit.
Input Wiring
IMPORTANT
Do not directly connect pin 1 on the amplifier’s input
or strapping XLR, to the amplifier’s chassis, speaker
groundorpowerground!
NOTE
Input signal ground is not to be used as a safety
ground(earth).
The input to your amplifier is a balanced 3-pin
system 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
goingtotheinputofyouramplifiershouldbewiredas
follows:
Pin1=GROUND/SHIELD.
Pin2=HOT(InPhase-noninverting).
Pin3=COLD(ReversePhase-inverting).
When wiring from an unbalanced source you must
ensurethatpin3isconnectedtopin1(inputground),
either by linking the pins in the input connector or by
thesourceequipment'soutputwiring.
Whenwiringforanunbalancedsource:
Pin1=GROUND/SHIELD
Pin2=HOT(inphasewiththeamplifier’soutput),
Pin3=GROUND/SHIELD(joinstopin1).
NOTE:
In-line XLR connectors often have a termination lug
thatconnectsdirectlytothechassisoftheconnector.
Donotlinkthislugtopin1attheamplifier’sinputasit
will defeat the amplifier’s input grounding scheme.
Thislugisoften referredtoasa"drain”andisusedto
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
groundsfromstraymagneticfields.
Output Wiring
Whenwiring toyourspeakersalwaysusethelargest
gauge wire your connector will accept. The longer
10 Installation