AUSTRALIAN MONITOR PA800 Operation Manual
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The AUSTRALIAN MONITOR PA800 is a professional audio power amplifier designed to deliver high-quality sound with exceptional clarity and power. With its advanced features and versatile connectivity options, the PA800 is ideal for a wide range of applications, including live sound reinforcement, DJ setups, and studio installations.
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Australian Monitor f,4aoo
& fi4rzoo
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Operation Manual
(-
(_
IMPORTANT!
Please
read
carefully.
This operation manual contains important information regarding safety precautions, installation, performance, operation and maintenan
e
of your Piseries porcramplifier.
You should familiarize yourself with the contents of this manual before operating your amplifier.
Safety Precautions and Labelling
The rear panelof the unit has a numberof markings and intemationally recognized symbols related to the hazards and precautions that should be taken when operating MAINS connecled equipment.
REFER SERVICING TO
QUALIFIED PERSONNEL.
NO USER SERVICEABLE
PARTS
INSIDE.
The presence
of a
LIGHTNING FLASH
with
an arrowhead 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 electricalshock.
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 usercan service orre-use in this oranyotherproduct.
This symbol is reinforced with the text:
RISK
ICAUT|ON! A
OF ELECTRICAL SHOCK
DO NOT
/A \
OPEN I \
lf
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 Monitordirect:
The presence
of
an EXCLAMATION MARK contained within the boundaries of a equilateral triangle is intended to alert the user that there is important operating and maintenance literature that accompanies the unit.
IWARNING! /\
DO NOT EXPOSE
RAIN OR
TO EITHER
,/
I
\
MOISTURE ! \
THE TECHN ICAL I\4ANAGER
AUDIO TELEX COMMUN ICATIONS PTY LTD,
PRIVATE BAG 149,
SILVERWATER. N.S.W. 2128
AUSTRALIA.
Phone
Fax
Local
(02)96471411
(02)96,483698
lntemational
(612)%47 1411 (612) 9648 3698
The unit should not be operated in a situation where it mayencounterthe entry ofwater, rain, oranyfl uids.
To expose the unit to the above conditions may make the operation of the unit hazardous and increase risk of electrical shock.
the ltu
Contents
1.
lntroduction
2.
Controls, Connectors and lndicators
2.1 Front Panel
2.2 Rear
Panel
3.
lnstallation
4.
Operation
5.
Bridge Mode
6.
Two Ohm or
Not
Two Ohm
7.
Maintenance
8.
Warranty
9.
Specification
Page
11
I
7
5
6
13
15
16
17
18
19
List of
Illustrations
Figure 1. Block Diagram
Figure 2. Front Panel Layout
Figure 3. Rear Panel Layout
Figure 4. Case Dimensions
Figure 5. "Speakon" Connector Wiring
Figure 6. Bridge Mode Speaker Wiring
Page
8
10
12
15
5
6
Features:
- Custom designed, 2RU heavy duty alloy
chassis.
- 1 Watt output indication (2.828volts).
- Open modular construction for ease of
servicing.
-
1 dB below output clip indication.
- Symmetrical layout - even weight
distribution.
- Massive heat-sink / heat-exchangers.
- well-regulating, high current power
supply.
- Efficient front to back cooling.
- High efficiency toroidal mains
transformer
Dual, twin speed axialfans.
- Binding post and Neutrik "speakon"
output
- Multi-role output fault indication.
conneCtion.
- Front carry handles. Rear rack mount ears.
- Stereo or bridged / mono
operation.
plug in signal modifiers (optional).
- lnput signalstrapping (loop through)
connectors.
- signal ground lifi switch.
- 21 Position detented
attenuators.
- Balanced inputs and buffered
- Highquality, close-tolerance components
attenuators.
throughout.
Protection Features
- Suppression of inrush current at mains
tum-on.
- High overload mains fuse.
- lnput muting at
tum-on.
- lnput overvoltage
protection.
- lnternal, independent DC supply railfuses.
- Layout, grounding, decoupling and componentry
- Radio-frequency interference
suppibssion.
have been optimized to provide the user with
- Short-circuit protection and
indication.
stability, reliability and longevity.
Ausfualhn Monitor
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Introduction
5
1. Introduction
Congratulations on choosing Australian your professional amplification
Monitor requirements.
for
The design of your
P4-Series e.mbrgce
Audio powerAmptifi all the aspects of a well designed unit. visual design, mechanical, electricalLnd sonic ers
The pa_ rameters, along with our dedicated process, have all been manufacturing optimized to provide a professional tool that exhibits quatity, reliability and longev_ itv.
The PA-Senes amptifiers are wide rack mountable units,
2
unit (3.5,,) tail,
19,,
Each cfrannel of the amplifier comprises a balanced active input with a differential class A drive stage which in turn
fan-cooled, a
buffered attenuator driving
class AB,
drivel a
MbSFET output
stage configured as a source follower. The unit operates from a high cunent-capable linear power supply.
These units have been specifically designed to de_ liver and provide the critical degree of your their high power output speakers,
at
with high duty minima'idistortion, control required by cycles
for
extended periods.
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Figure
1
Amplifier Block Diagram
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6
Controls &-
Connectors
2
.
Controls,
Connectors
&
Indicators
Figure
2
Front Panel Layout
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Controls & Connectors
7
Front
Panel
The
Pi
Series models have identical front panel layouts.
Fig u re
7 shows the panel layout of the PlSeries. The fu ndions of the controls and indicators are as fol lows:
3 Fault Indicator
This amber LED will flash when a fault condition exists.
I
2
Aftenuator
Level control for your amplifier is provided by a 21 position detented potentiometer and indicates gain reduction in decibels from the 0 dB position
(maximum gain, no attenuation).
Status Indicator
The fault detection circuit monitors the difference between drive and output in your amplifier.
lf you have a short on the speaker output (or a blown negative rail fuse) the LED will flash brightly in sync with the programme. This
LED will also flash with programme peaks for gross overloads or if the load is 2 ohms or less.
The circuit has two stages of operation:
This is a dual color LED which displays the status of the output stage and displays three levels of operation.
These levels are:
Below 1
watt
1 watt and
(unlit)
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). This is equivalent to:
24dB below rated powerfor a PA800 or
26dB below rated power for a PA1200.
The
LED
will
change
to
red once
the
output exceeds the -1dB point before actual clipping of the amplifiefs output stage. The threshold of the
-1dB point is refened 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), status circuit are those of
of
the
a
Peak Programme
Meter
(P.P.M.)
:.
lf using this indicator to line up sensitivities, apply a steady state tone (e.9. slate on a mixing console).
The 1 watt level
is
the mid-point between the indicator illuminating and extinguishing green.
1. lt will provide indication (e.9. gross overload) but does not affect the input signal (a faint flash).
2. lt will indicate and mute the input signal (e.g
shorted output) (brightly flashing or permanently on).
+
Power
Switch
5
Press the switch to the to the left for power off right for power on ( I
( 0
).
At
)and start-up (turn-on) the input to the amplifier is muted by 30dB for approximately two seconds.
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
intemal operating temperature of one or both exceeded amplifierchannels has
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 cooldown period, theywill un-mute and return to normaloperation.
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.
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
prematurely going into thermal shutdown mode.
it
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Controls
81-
Connectors
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Figure
3
Rear
Panel Layout
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Controls &- Connectors
9
Rear Panel
to 24O volt mains supply.
5
Balanced Input
A female 3-pin XL type connector is provided on each input:
Pin 1 = SignalGround;
Pin 2
= Hot
(non-inverting or in phase);
Pin 3
= Cold
(inverting or reverse phase).
6a Signal Strapping
A male 3-pin XL type connector is provided and wired in parallel with the female input XLR for strapping / looping signal between amplifiers.
7
Signal Ground
Lift
Switch
When this switcfr is engaged it disconnects signal ground nels. from the input connectors on both chan-
lt 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. (lt does not intenupt signal ground continuity on the strapping connector). The amplifier engaging should be tumed off before
this
switchl
8
Binding Post Outputs
Touch proof binding posts (banana jacks) are provided
for
speaker output termination with banana plugs orbarewire. The red post is used as positive and the black post is used as negative.
8a SPEAKON
Ouput
Connector
The NEUTRIK (NL4MP) 4way SpEAKON connector is provided as an additional speaker output.
This emerging standard of loudspeakerto amplifi er connection allows a@ess to both channels of the amplifier via the one connec{or for bi-amp applications. Channel-A channel is considered the dominant and has both channelS wired
to
the
Speakon connector. See the installation section of this manual for detailed information on Speakon wiring.
9
Mains Connection
Your amplifier
is
fitted with
an
internationally recognised IEC mains inlet connector.
Please ensure that the connecting mains lead for usewiththis conneclor isof an approvedtype and is of sufficient current carrying ability.
Your Ptlauand P4tzm require a minimum mains lead rating of
1
0 amps when operate dfrom a22O
NOTE: Your unit must always be earthedt
10 Mains
Fuse
A 20mm x Smm fuse drawer is provided within the housing of the IEC mains connector. 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 damage if an internal fault exists.
When replacing the fuse, replace with an antisurge (slow blow)
type of the
current rating indicated on the back panelabovethefuse holder.
Warranty does not cover
a
blown fuse or any resulting damage due to an incorrect fuse rating or type.
The PAau requires
a 8
Amp Anti-Surge fuse.
The P4tzu requires a 10 Amp Anti-Surge fuse.
1l
Bridge Switch
Pushing this switch
MONO mode
in
engages the BRTDGED/
of
operation.
ln
this mode your amplifierwill 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 (reversed phase) and speaker termination should
be
sourced from
the
red binding-post outputs.
D.C. Rail
Fuses (Internally fitted)
Removing the bottom lid will show PCB mounted fuse holders holding the rail fuse for each supply
to
each channel. These 3AG
.fast blou/' type fuses are in series with the positive and negative supply rails for each channel of your amplifier,s output stage. Thesefuses provide overall protection of the output stage and can also be used to isolate individual channels in case a fault condition exists.
lf you need to replace the rail fuses they must be replaced with the same type and cunent rating:
Prfu =
8 Amp.
Plrm
=
10 Amp.
NOTE: Replacement of the fuses should only be carried
out by a
competent and experienced person.
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Installation
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4
Dimensions
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lnstallation
1
I
3.
Installation
heat to build up within the unit and possibly force the unit into its thermal shutdown mode.
Power
Requirements
Model:
Mains Voltage
240,220-230
PlsM
Fuse Rating
8 Amps
lf
the units are to be operated in an environment wherethe airflow is restricted such as sealed racks or even when running 2 ohm loads, the cooling should be supplemented by extra cooling fans to evacuate the heated air and aid the flow of cool air through the unit.
Power
Power consumption at
idle =
120Watts.
consumption at rated
power
= 1450 Watts.
Input Wiring
IMPORTANT
Model:
Mains Voltage
240,220-230
P4rzu
Do not directly connecl pin 1 on the amplifieds input or strapping XLR, to the amplifier's chassis, speaker ground or power ground!
Fuse Rating
10 Amps
Power
Power
NOTE consumption at
idle = 160Watts.
lnput signal ground is not to be used as a safety consumption at rated
power = 22AOWatts.
ground (earth).
Ensure that your mains voltage is the same as rear panel mains voltage marker
(+l- the
lh91nu!toyouramplifierisa balanced3-pinsystem
1}o/o).
andrequiresallthreepinstobeconnected. Onlyhigh quality twin-core shielded cable should be used.
Mounting
Your amplifier
is
designed
for
standard 1g" rack mounting and occupies 2 EIA rack units (3.5"). The mounting centers are:
When wiring for a balanced source the connector going to the input of your amplifier should be wired as follows:
Vertical:
3.0" (76.2mm)
Horizontal: 18.2" (461.2mm)
to
18.7" (473.8mm).
Pin2
= HOT (ln Phase - non inverting).
Pin 3
= COLD
(Reverse Phase - inverting).
Pinl
=GROUND/SHIELD.
The slots in the mounting flange
will
accept bolt diameters up to 1/4" (6.35mm).
\A/hen wiring from an unbalanced source you must ensure that pin 3 is connected to pin
1
(input ground), either by linking the pins in the input connecloror by the source equipment's output wiring.
We recommend that you provide additionalsupport forthe amplifier, especially if road use is planned, as the weight can bend some racks otherwise. This support can be provided by secure shelving, support rails or a rear rack mounting strip to match up with rear rack mount ears provided on your the
Pl
Series amplifier.
When wiring for an unbalanced source:
Pin2
=
Hot (in phase with the amplifier's output),
Pin 3 = GrouncUShield (ioins to pin 1).
Pin 1 = Ground/Shield t
Cooling
Each chann el
d
your
PAm/Pltmamplifier
is cooled by an axial fan which draws cool air from the front of the unit and expels the heated air from the rear of the unit. These units offer two speed fans which run at half speed, switching to full speed when the intemal heatsink temperature exceeds 600C (1280 F).
An unrestricted airflow into and outfrom the unit must be provided. Any restriction of the airflowwill c€luse
NOTE: ln-line XLR connectors often have a termination lug thatconnects directlyto thechassis 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 reduee earth loop noise, ornoise induced intosignalgrounds from stray magnetic fields.
Aus;bdlan Monitor
I
2
Installotion
Output Wiring
When wiring to your speakers always use the largest gaugewire yourconnectorwill accept. The longerthe speaker lead the greater the losses will be, resulting in reduced power and less damping at the load. We recommend core flex using a heavy duty two core flex (four
if
bi-amping) 10
to
12 gauge (2mm2 to
2.5mm2 or 50/0.25 or equivalent) as a minimum.
The "Channel A" SPEAKON actually carries both channelA
& channel B outputs (se e Figure 5: Speakon
Connector Wiring Diagrams).
The "Channel B" SPEAKON canies the Channel B output only.
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 black terminal is negative (ground).
lf running in BRIDGE mode, only the red binding posts are used. Channel
A
provides the positive outputtothe load and channelB providesthe negative output to the load.
This anangement allows you the option of connecting to the outputs separately ortogether. 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 channel B output twice!
Channel A is used as the "dominanf channel and when sourcing
a
dual output from Channel A the following standard should be used:
SPEAKON Outputs
When using the NEUTRIK SPEAKON (NL4MP) nector con-
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 amplifier.
are
provided
on
the
Channel A = Left or Low Frequencies.
Channel B = Right or High Frequencies.
\A/hen in bridge mode:
Pin 1+
= Bridge Output Positive
Pin 2+ = Bridge Output Negative.
SINGLE CONNECTION
CH
A/LEFI
OR
CH B/RIGHl
BRIDGED CONNECTION
DUAL CONNECTION BI.AMP CONNECTION
CHA
SPEAKON
Figure 5. "Speakon" Cannector Wring Diagram
ltu
Operation
l3
+.
Operation
IMPORTANT
All signal source equipment should be adequately earthed. This not only ensures your safety but everybody else's as well. Faults can and do occur in mains connected equipment where the chassis can become'live" if it is not properly earthed. ln these instances the fault in a "floating' (ungrounded) piece of equipment will look for the shortest path to ground which could possibly be your amplifie/s input. lf the fault cunent is large enough it will destroy the input to your amplifier and look for the next available path, which may be you!
Before making any connections
to
your
Piau/
Ptihzu amplifi er observe the fol lowing:
1.
Ensure the mains voltage supply matches the label on the rear panel of youramplifier (+/-
1
0%).
2.
Ensure that the power switch is OFF (to the left -
0)
3.
Ensure
that all
system grounds (earth). are connectedfrom a common point. Avoid powering equipment within a system from multiple power sources that may be separated by largedistances.
4.
Check the continuity of all interconnecting leads to your amplifier, ensure that there are no open or short circuited conductors.
5.
Ensure that
the
power handling
of
your load
(speakers) can adequately cope with the power output of the amplifier.
Before operat ngyour Pfuf?r'hzuamplifi er, ensure that:
-
The attenuators are at
the'OFF'
position (fully anticlockwise).
-
The GROUND LIFT Switch is not engaged (should be in
the'ouf
position).
-
The BRIDGE Switch is not engaged if you are not running the amp in bridged mode.
t
Powering Up
REMEMBER
The amplifier should be the last piece of equipment thatyou tum on and thefirst piece of equipmentthat you tum off.
accept signal. The lnrush Cunent Supression (lCS) circuit is in operation for the first 0.5 seconds. This l imits the mains cunent to prevent "nuisance-tripping" of circuit breakers.
During this period the THERMAUON LED willflash red whilstthe mains voltage gradually charges up the power supply. You
will
then hear
a
relay "clicK, indicating mains is now directly applied to the amplifi er and the THERMAUON LED willbe green.
While the ICS circuit operates there is also a 30dB mute on the signal input. Aftertwo seconds this mute
will
release, allowing any applied signal
to
pass unattenuated.
When switching the amplifier off, wait a couple of seconds before switching the unit on again. This allows the ICS circuit to reset.
Level
Matching
The normal operating position for the attenuator is the "0 dB" position (fully cloclwise, no attenuation).
ln this position the amplifier operates at full gain.
Turning the attenuator back (anticlockwise) reduces the input sensitivity by the amount marked on the attenuator scale (dial).
NOTE: lf full power output is required you should operate your amplifier with the front panel attenuator above the
-15d8
position, othenrise clipping of the input circuitry and its resultant distortion will occur before full output power is achieved.
Sensitivity
Youramplifier is a lineardeviceoperatingwith afixed input to output voltage gain (less attenuation). The maximum output voltage sldng is determined by the applied mains voltage, load, load type and the duty cycle of the applied signal.
The voltage gain factor of your amplifier is:
37 (31.5 dB) for a PA800
45 (33.0 dB) for a PA1200
Th e i n put sensiti vity f o r y our Pr4am/?4tzu amp
I ifi er when
the
attenuator
is at
the "O' dB position (fully clockwise) is nominally: attenuation
We
recommend tuming
the
attenuators
on
your amplifier down when turning the unit on.
When you power up you r
Pfu/Prltzu,your
ampl ifi er goes through an establishment period before it will
+4.0d8
(1 .23 volts in) for rated power into a 8 ohm load.
+3.0d8
(1
.
10 volts in) for rated power into a 4 ohm load.
Asbalian Monitor,
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l1
Operation
Each channel of your
Plw/F,hzn
amplifier has a nominal balanced
input
impedance
of
3OkOhms
(@1kHz) and should not present a diffiq.rlt load for any signal source.
Your signal source (i.e. the equipment feeding the amplifier) should have
an output
impedance of
600 Ohms or lower to avoid urnvanted h i gh freq uency loss in the cabling.
lnput overload occurs at +20.5d8u (8.25 volts).
See the specification section for more detailed information.
Hum
Problems
Most equipment is designed for minimum hum when used under ideal conditions. When connected to other equipm€nt, and to safety earth in an electrically noisy environment however, problems wi ll often ocanr.
The three "E"s of hum and hum related noise which can plague your audio system are: a) Electrostatic radiation, b) Electromagnetic radiation, and c) Earth loops
Electrostatic radiation capacitively couples to system elements causing an interference voltage that mainly affects higher impedance paths, such as amplifier inputs. The source is generally a nearby high voltage such as a mains lead or a speaker lead.
The problem offending can usually be reduced by moving the lead away,
or by
providing additional electrostatic shielding (i.e.
an
earthed conductor wfrich forms a banier to the field).
Electromagnetic radiation induces interference currents into system elements that mainly effect lower impedance paths.
Rqdio transmitters or stray magnetic fields from mains transformers are often the cause of this problem. lt is generally more difficult to elirninate this kind of interference, but again, moving the a source away or providing a magnetic steel shield) should
help.
I shield (i.e.
Earth
loops
can arise from the interfacing of the various pieces of equipment and theirconnections to safety earth.
difference between the amp earth and source equipment earth appears to the amplifief s input as a signal and is amplified as hum.
There are three things you can do to avoid earth loop problems:
1.
Ensure your mains powerforthe audio system is
"quiet" i.e. without equipment on it suclr as airconditioning, refrigeration or lighting whicfr may generate noise in the earth circuit.
2.
Ensure all equipment within the system shares a common ground/ safety earth point. This will reducethe possibility of circulating earth currents as the equipment will be referenced to the same ground potential.
3.
Ensure that balanced signal leads going to the amplifier are connected to earth at one end only.
Signal Ground-Lift Switch
When proper system hook-up has been carried out, you may still have some hum or hum related noise.
This may be due to any of the previously mentioned gremlins.
Y our
PtfutPltmampl
ifi er has a
" S ignal Ground
Liff
switch which disconnects the input ground wiring from the amplifier. A substantial drop in hum and or hum related noise can result from judicious use of this switch.
NOTE lf the input ground lift switch is used you must ensure adequate shielding of the input wiring. lf the signal
source
equipment
does not
provide adequate shielding (i.e. a definitive connection to ground) you must disconnect the shield from the input connector's ground pin (Pin-1) and re-connect it to the "drbin" contact on the input connector. This will ensure the shield
on
your input wiring actually goes
to
the amplifier chassis and subsequently to earth.
DO NOT CONNECT PIN-1 DIRECTLY TO THE
DRAIN CONNECTION.
You
will
defeat
the
amplifiers intemal grounding scheme and possibily cause instabilitytothe amplifi er.
This is byfarthe most common cause of hum, and it occurswhen source equipment and the amplifierare plugged into difierent points along the safety earth where the safety earth wiring has a cunentflowing in
il
The cunent flowing through the wire produces a voltage drop due to the wire's resistance. This voltage
Always ensure that your amplifier
is off
and the attenuators are down when you engage this switch.
This switcfr should only be used when the amplifier is operated from a balanced signalsource.
NOTE: Be wary of quasi{calanced outputs, these are often no more thanfloating unbalanced outputs.
ltu
Bridge
Mode
15
5.
Bridge Mode
The term BRIDGE is used when two independent amplifier
The load channels are used to drive the same load.
is
in series amplifier channels.
(a bridge) between the two up y our
Piau/Pirzu
am p
I if i er for ru nn i n g it i n B R
I
D GE mode.
Whilst the amptifier is
ofi
1 .
Connect the signal source to the Channel-Afemale input XLR. The Channel-A attenuator becomes the level controlfor both channels.
ChannelA is used asthe "dominant', channel and its output is in phase with the input signal, and channel
B has its phase reversed so it is exacily 1g0o out phase with the input signal.
of
2. Engage the "push to bridge" switch.
As two amplifiers with a phase difierence of 1gS are now driving the load you will now have double the voltage into the load. This means you will now have four times the
porcr
into that load. The output can now be considered as an active balanced output.
3. Connect your load between the red binding post output terminals, where the positive side of the load is connected to lhe channel
A output (marked
BRIDGE+) andthe negativesideof the loadgoes to the channel
B output (marked BRIDGE-). There are no further connections required.
Acommon useof an amplifier in BRIDGE mode driving 70volt& l00voltdistribution tines. ln isfor
BRTDGE mode, The Pthzo can produce over 100 volts with line impedances over 8 ohms whilst the &Qao can produce over 84 volts with line impedances over g ohms.
Equally the units can be used in bridge mode to provide the correct voltage/power requirements for an applicable load.
As shown in Figure 6, there are three steps in setting
You can also source the output from the Channel-A
SPEAKON output connector where Channel-A will be on the pin marked
1
+ and Channel-B will be on the pin marked
2+.
NOTE: You should check after market manufactured
Speakon interconnecting speaker
leads
before connecting them to your amplifier.
Some leads are manufactured for specific purposes, or specific use, and may have pins shorted inside the connector. Any speakon lead with shorted pins willobviously short the output
of
your amplifier (either output to output - be careful)
to
ground, or
Fiox
!ilcNAL souecc
I
-
-
o
!il!
!il!
(::=f
?fftil
8fifil
-
-
-)
(-
-
-
(-
Figure
6
Bidge Mode Speaker Connection
Australian Monitor
/tu
16
Two Ohm or Not Two Ohn
6. Two Ohm
Not Two or
Ohm
NOTE:
Ensure adequate ventilation and monitor the
FAU LT indicators to guard against thermal shutdown when driving two ohm loads.
specification sheet is derived from a voltage exanrsion into
a
resistive load
for a
sine wave
at a
given frequency. Though this method is in line with the various standards that exist, it only gives an indication to the maximum voltage s,wing (before clipping) for a given load. Th is method of rating power does not give an indication of the current (Ampere) capability of the amplifier, nor does it show the amplifier's ability to sustain high energy waveforms.
A Preamble.
The load that a loudspeaker presents to an amplifier is very complex and at different frequencies can be inductive, capacitive, resistive, or a combination of these (reactive). With the these attributes, which complex interaclion of alter from loudspeaker to loudspeaker, not a definitive load for an amplifier does really exist.
Your P4au/P,'hzmamplifier is designed to be able to deliver more than twice the cunent than that shown on the specification sheet to cope with difficult loads andlor high energy waveforms.
This extra cunent reserve is the result of over engineering and is the headroom the amplifier utilizes to control the loudspeaker and dealwith the "reactive energy" from the loudspeaker load that has to be dissipated within the amplifier.
Loudspeakers operating within
an
enclosure are specified with a nominal impedance. This nominal impedance
is
only
a
rough guide
to the
load it presents to an amplifier.
As an example, a loudspeakerwith a nominal impedance of say 8 ohms, may have an impedance of over
50 ohms at resonance (bass frequencies), drop to less than 6 ohms after the resonance peak (through its mid band area) and then increaseto over 16ohms for higher frequencies.
A 4 ohm load makes an amplifier work "harde/' than an 8 ohm load at the same voltage, as double the cunent is required.
Though various loudspeakers may be marked with the same nominalimpedance, some loads are more difficult than others.
Bass frequencies usually exhibit higher impedances and require higher voltages to achieve the desired result. They also reflect higher energy back to the amplifier simply due to the amount of cone excursion involved at lower frequencies.
The Mid frequency band usually offers the lowest impedances and the highest duty cycles requiring both high voltage and high cunent.
The High frequency region usually offers a moderate impedance and usually does not need much voltage but the instantaneous current demand can be much greater than you think.
As well as this burden on the amplifier, the transient waveforms found in actual use can demand
a
lot more current than the "steady-state" sinewaves used in most amplifier bench tests.
The power output of your
PimlPhzmquoted
on the
Your
Pfu/Ptltzm
amplifier is able to drive 2 ohm loads or operate in BRIDGE mode into 4 ohms. The operator must be aware that when driving loads
or
bridged
2
ohm
4
ohm loads that
the
currents running in the output stage are very large and will
€use
greater heat build up within the amplifier than higher impedance loads.
The Front Panel FAULT lndicators can be used to provide an indication of the "difficulty" of the load and will give the operator an indication of the heat build up in the output stage.
lf the fault indicators flash with the "clip" LED or do not illuminate until well into clippingthen the load can be considered as normal or easy.
lf the fault indicator starts to flash before the "clip"
LED then the load should be considered complex and/or difficult.
For
the
more complex and/or difficult loads, the illumination of the'Yault'
LED on programme peaks should
be
interpreted
as
the
output level
limit.
Driving the output continuously past this point could result in muting of the output stage, fuse's blowing or premature thermal shutdown.
Thefault detection circuit is also thermally compensated, and fault indication will occur earlierwhen the unit is hot. lf the'fault"
LED continually lights earlier than normal, then the unit is heating up. lf the signal level is not reduced to compensateforthe heating of the unit then thermal shutdorrn may occur.
/tu
Maintenance I7
7
.
Maintenance
Y our PAau/h4tzm ampl ifi er wi ll need minimat maintenance. No intemal adjustments need to be made to the unit to maintain optimum performance.
To provide years of unhindered operation we suggest a maintenance inspection be canied outon a regular basis, say every 12 months or so.
Fan
Due s to the openness of the air path through your
PiwlPrhzu
amplifier, very litfle dust should setfle within the amplifier. The unit has been designed so that any dust and/or foreign particles that do setfle within the amplifierwill not unduly hinder the cooling of the unit.
holdthefan rotorstillandwipethe dust off the blades.
Many uses stall the fan and use compressed air to blowthe dust off the fan blades. lt is important to note thatthefan blades must be held stillwhilstblowing air over the blades othenrrise you may burn out the bearings in the fan.
Fuses
Alongwith rearpanel mainsfuse, there isfour(4) rail fuses provided internally in the unit. These railfuses are in series with the positive and negative output supply to each amplifier channel and provide overall protection for the output stage.
lf
the amplifier is subjected to heavy use such as short circuits, 2 ohm or bridged 4 ohm loads, these fuses will eventually fatigue and may require replacing to ensure they do not fail at an inconvenient time.
The mesh grille in front of the fans will act to limit the amount of dust and lint entering the unit. You will find in time the that there will be a build up of dust and lint on grille which may start to hinder the airflow through the unit. You should periodically remove the dust and keep the grille clean. Removal of dust from the rear grille will also aid cooling.
NOTE
Make sure the unit is off and is unplugged from the mains.
Give the
main
filter
capacitors
time
to discharge before removing lids and inspecting the fuses.
You should replacethefuse if theelement is sagging
or
discoloured. Only ever replace with the same type fuse and current rating.
Overtime, dust may build up on the leading edge of the fan blades
and
reduce their cooling efficiency.
The time taken forthis to happen will depend on the environment and the amount of use.
The
fan
blades are accessible once the lids are removed and can be easily cleaned. You need only
When checking for a failed fuse, do not rely on visual inspection alone. You should use an ohmmeter to check continuity.
Only competent or qualifi ed persons should attempt any service or maintenance of your amplifier.
Arsbdhn
I'tonitor
lfu
l8
Warranty
8. Warranty
Australian Monitorwarrants the original purchaser of each PA-Series amplifier (purchased at an authorised
Australian Monitor dealer) that it will be free from defects in materials and workmanship for a period of two (2) years from the original date of purchase.
refuse warranty service where the orner fails to take reasonable care in use and maintenance of the amplifier.
Australian Monitorwill, at its option, repair or replace any unit or component covered by this warranty which becomes defective or malfunctions under normal use and service during the period of this warranty, at no charge for parts or labour to the original owner.
To validatethiswananty, the original purchasermust complete and mailthe warranty registration card directly to Australian Monitor within fourteen days of purchase.
This warranty does not cover blown fuses, faulty fuse contacts, thermal problerns due to obstructed airflow, ordefects or malfunctions resulting from accidents, misuse, abuse, operation with the incorrect AC mains voltage, connection equipment,
modification to
faulty
or alteration
without prior factory approval or seruice by unauthorised personnel.
To obtain warranty service, the equipment should be shi pped to an authorised Australian Monitor dealer or to Australian Monitor at the owner's expense.
U n its with a def;aced seri al nu mberwi
I
I not be
aepted
forwarranty service. Any evidence of alteration, erasure orforgery of the purchase receipt will also void this wananty.
Australian Monitor accepts
no liability for
any consequential damages, whether direct or indirect, arisi ng from the use or misuse of its products.
It is the owner's responsibility to ensure that normal maintenance inspections are carried out at regular intervals as recommended in the maintenance section of this manual. Australian Monitor reserves the right to
Australian Monitor reserves the right to alter its designs and specifications at any time without notice or obligation to previous purchasers.
/fu
Australian Monitor
RANw
REG
rsrRATroN P4-seRr
ES 2
vEAR wAR
IMPORTANT
Please complete this card and return
it
immediately after unpacking the product.
This card is to be sent
DIRECTLY
to Australian Monitor.
NOTE!
Warranty is effective
ONLY
upon receipt of this card.
COMPANY
NAME
ADDRESS
MODEL
SERIAL N"
DATE PURCHASED
CITY DEALER
STATE CODE
COUNTRY
Ensure that you ftll out and send your wananty registration card.
Use fhis copy to record a duplicate of the details.
SpeciJicafion
19
Model
,
PitZOO
E.l.A
1 kHz, <0.1 06
Single
THD+N.
Sohm
channeldriven.
44OW
Both channels
driven.
400W
Pulsed @ 1 kHz, at onset of clipping,
10% duty cycle, re 4 ohms.
Single channel driven.
Both channels driven.
Bridge mode
16
8 ohm load ohm
load
1200W
Output
Impedance
@
1 kHz
<0.025 ohms
Damping Factor
@ 1
ktzre I ohms
>32o:1
Output Rise Time
(80%, leading edge of 2lkHzsquare wave)
(leading edge, 20kHz square wave
@ ctipping)
Weight
Net 37.5 tb (17kg), Shippins 43tb (19.5kg)
Model
, PIAOO
Output Power
E.l.A. 1 kHz, <0.1 %
Single channel
THD+N. Sohm
4ohm
driven. 285W
460W
Both channels
driven. 255W
400W
Pulsed @ 1 kHz, at onset of clipping,
10% duty cycle, re 4 ohms.
Single channel driven.
Both channels driven.
550W
500w
Bridge mode
16 ohm load
8 ohm load
510W
800w
Output
Impedance
@
1 kHz
<0.030 ohms
Damping Factor
@ 1 kHz re 8
ohms
>260:1
Output Rise Time
(8006, leading edge of ZOkHzsquare wave)
<2.8 pS
Slew
Rate
Sov per pS
(leading edge, 20kHz square wave
@ clipping)
Weight
Net 33 lb (15kg), Shipping 38.5 tb (17.5kg)
Common Specifications
Distortion
(0.5 dB betow ctipping re 4 ohms)
THD+N
(@
1
kHz)
IMD SMPTE (60 Hz
IMD DIM
&7
<O.O1%
kHz41)
<0.05%
30
(3.15kH2 sguare & 15 kHz) <O.O2o/o
Input CMRR
@
1 kt.i.z
(re 8 ohm rafing)
Signal ,/ Noise ratio
'A" weighted (re 8 ohm rating)
Frequencv
Response
2OHz-20k{z
-3dB points
<
r
0.15 dB
<10 Hz - 90 kHz
Crosstalk
@
1 kHz (re 8 ohm rating)
Input
Impedance
Line to Line (Balanced)
30k ohms
Dimensions
excluding handles
Input Sensitivity
(nominaily)
For rated power re 8
ohm
1.26 Vrms (+4 dBu)
For including handles rated power re 4
ohm
1.10 Vrms (+3 dBu) (19 inch EIA rack mounting,
H
xW x
D
3.5 x
19
88
x 482
3.5 x
19
88
x 482 x
14.8 (inch)
x 375
(mm) x
17.7 (inch)
x 450
(mm)
2 units high)
Test conditions
Input source = 600 ohm, Balanced and ground referenced (CMRRtest had floating ground source). Mains regulated to 240 volts
Standard production units measured. No compensation applied.
& E0 ohm
/
50h2. All measurements taken at binding posl output terminals.
Aushalian Monitor
/tu
Australian Monitor
Distributed
by:
Audio
Telex
Communications
Pty Ltd
ACN 001345.+82
Australia www.audiotelex.com
lnternational Enquiries
Ph: 61 -2-9647
1
411, Fax: 6i -2-97
48
2537, E-mail : [email protected]
Sydney
Ph: (02) 9647 1411, Fax: (02) 9648 3698, E-mait: [email protected]
Melbourne
Ph: (03) 98907477, Fax: (03) 9890 2927, E-mait: [email protected]
Brisbane
Ph: (07) 38521312, Fax: (07) 32521237, E-mail: [email protected]
'
Perth
Ph: (08) 9228 4222, Fax: (08) 9228 4239, E-mait: [email protected]
Auckland
Ph: (09) 4159426, Fax: (09) 415 9854, E-mait: [email protected]
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