Australion monitor AMC30 User manual

AMC SERIES
30W/60W/120W/250W MIXER AMPLIFIERS
INSTALLATION AND OPERATION MANUAL

IMPORTANT SAFETY INFORMATION
1. Save the carton and packing material even if the equipment has
arrived in good condition. Should you ever need to ship the unit, use
only the original factory packing.
2. Read all documentation before operating your equipment. Retain
all documentation for future reference.
3. Follow all instructions printed on unit chassis for proper operation.
4. Do not spill water or other liquids into or on the unit, or operate
the unit while standing in liquid.
5. Make sure power outlets conform to the power requirements listed
on the back of the unit.
6. Do not use the unit if the electrical power cord is frayed or broken.
The power supply cords should be routed so that they are not likely
to be walked on or pinched by items placed upon or against them,
paying particular attention to cords and plugs, convenience
receptacles, and the point where they exit from the appliance.
7. Always operate the unit with the AC ground wire connected to the
electrical system ground. Precautions should be taken so that the
means of grounding of a piece of equipment is not defeated.
8. Mains voltage must be correct and the same as that printed on the
rear of the unit. Damage caused by connection to improper AC voltage
is not covered by any warranty.
9. Have gain controls on amplifiers turned down during power-up
to prevent speaker damage if there are high signal levels at the inputs.
10 Power down & disconnect units from mains voltage before making
connections.
11. Never hold a power switch in the “ON” position if it won’t stay
there itself!
12. Do not use the unit near stoves, heat registers, radiators, or other heat
producing devices.
13. Do not block fan intake or exhaust ports. Do not operate equipment
on a surface or in an environment which may impede the normal flow
of air around the unit, such as a bed, rug, weathersheet, carpet,
or completely enclosed rack. If the unit is used in an extremely dusty
or smoky environment, the unit should be periodically “blown free”
of foreign matter.
14. Do not remove the cover. Removing the cover will expose you
to potentially dangerous voltages. There are no user serviceable
parts inside.
15. Do not drive the inputs with a signal level greater than that required
to drive equipment to full output.
16. Do not connect the inputs / outputs of amplifiers or consoles to any
other voltage source, such as a battery, mains source, or power supply,
regardless of whether the amplifier or console is turned on or off.
17. Do not run the output of any amplifier channel back into another
channel’s input. Do not parallel- or series-connect an amplifier output
with any other amplifier output. Australian Monitor Inc is not
responsible for damage to loudspeakers for any reason.
18. Do not ground any red (“hot”) terminal. Never connect a “hot” (red)
output to ground or to another “hot” (red) output!
19. Non-use periods. The power cord of equipment should be unplugged
from the outlet when left unused for a long period of time.
20. Service Information Equipment should be serviced by qualified service
personnel when:
A. The power supply cord or the plug has been damaged.
B. Objects have fallen, or liquid has been spilled into the equipment
C. The equipment has been exposed to rain
D. The equipment does not appear to operate normally, or exhibits a marked
change in performance
E. The equipment has been dropped, or the enclosure damaged.

INTRODUCTION AND CONTENTS
PAGE 3
AMC SERIES INSTALLATION & OPERATION MANUAL
The Australian Monitor AMC series of amplifiers takes the heritage & reliabil-
ity of our famous AMIS series amplifiers & integrates these features into low
cost amplifiers for applications where reliability is everything, but the more
elaborate features of our AMIS series are not required.
Available in 30, 60, 120 & 250 watt versions, the AMC series are 2 RU mixer
amplifiers, featuring 70/100 volt line & 4 ohm outputs, & 3 universal mic/line
inputs
Master volume & overall treble & bass controls are provided, along with Vox
triggered muting (defeatable), giving channel 1 priority over inputs 2 & 3.
There is also the facility to add a tone generator card.
The Australian Monitor AMC series gives the contractor a low cost alterna-
tive in applications that are price sensitive, but still require a high quality of
sound reproduction & reliability.
INTRODUCTION 3
FRONT PANEL 4
REAR PANEL 5
INSTALLATION 6
TROUBLESHOOTING & BLOCK DIAGRAM 7
FUNCTIONAL NOTES
& INTERNAL ADJUSTMENTS 8
DIMENSIONS 9
SPECIFICATIONS 10
AUS, EUR, USA
Copyright 1st Apr 2005
Rev A: 1st Apr 2005
Rev B: 6th Jun 2006
This symbol is intended to alert the user to the presence
of uninsulated “dangerous voltage” within the products
enclosure that may be of sufficient magnitude to constitute
a risk of electric shock to persons.
This symbol is intended to alert the user to the presence
of important operational and maintenance (servicing)
instructions in the literature accompanying the appliance.
To prevent electric shock do not use this (polarised) plug
with an extension cord, receptacle or other outlet unless
the blades can be fully inserted to prevent blade exposure.
To prevent electric shock, match wide blade of plug to wide
slot, fully insert.
Caution:
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK),
NO USER SERVICEABLE PARTS INSIDE,
REFER SERVICING TO QUALIFIED SERVICE PERSONAL.
WARNING!
TO REDUCE THE RISK OF FIRE OR ELECTRIC HOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCK
DO NOT OPEN

FRONT PANEL
PAGE 4 AMC SERIES INSTALLATION & OPERATION MANUAL
2 3 41 5 6
CH 1-3
These control the levels for each channel input.
BASS
There is 12dB of cut and boost at 100Hz.
TREBLE
There is 9dB of cut and boost at 10kHz.
MASTER
This controls the overall mixed output level.
ON
This LED indicates the unit is powered “on”.
POWER
This switch switches power on or off the mains. The
up position is on.
1
2
4
5
6
3

REAR PANEL
PAGE 5
AMC SERIES INSTALLATION & OPERATION MANUAL
CH 1-3
Each channel input section has two inputs: XLR
input - This is a balanced microphone input. It has
an input sensitivity of 1mV. RCA input - This is an
unbalanced line level input. It has an input
sensitivity of 500mV. The two RCA sockets are
summed to mono internally.
TAPE OUTPUT
The TAPE output is on unbalanced RCA connectors.
The output level is 150mV into 10kohm at rated
output. The output is dual mono.
The TAPE output is not affected by the MASTER
volume control or the BASS and TREBLE controls.
The TAPE output does not receive the tone signal if
the optional tone generator module is installed.
LINE OUTPUT
The LINE output is on a balanced XLR connector. The
output level is 1V into 1k at rated output.
NOTE: When wiring the LINE output as
unbalanced, Pin2 should be wired as hot
and Pin1 should be wired as ground/
shield. Do not wire Pin3.
DIRECT OUT
The speaker connections are on the 12 pole terminal
strip. There is a low impedance output (OHM) and
a distributed line voltage output (LINE). 70V out is
available on 115V models. 100V out is available on
230V/240V models.
1
2
4
5
6
3
MINIMUM IMPEDANCE
AMC30 AMC60 AMC120 AMC250
Distributed Line Output
70V (115V version) 166ohm 83ohm 41ohm 20ohm
100V (230/240V version) 333ohm 166ohm 83ohm 40ohm
Low Impedance Output
(both versions) 4ohm 4ohm 4ohm 4ohm
NOTE: Only connect one output - either Distributed Line or Low
Impedance per channel. Do LowZ and 70/100V at the same time
The output strip comes fitted with a touch-proof cover held in place by two M3 machine screws
with flat and spring washers..
IEC MAINS INPUT SOCKET
This is a standard IEC 3 pin socket. It accepts a standard IEC mains cable, provided. The fuse draw
at 5 contains the mains fuse and a spare. The mains fuse is a time lag (slow blow)
HRC 20mm x 5mm ceramic type fuse.
The ratings are:
AMC30 AMC60 AMC120 AMC250
230V/240V model 0.5A 1.6A 2A 3.15A
115V model 1A 3.15A 4A 6.3A
Always replace the fuse with one of the same
value and type.
NOTE: Always disconnect power to the amplifier
before replacing fuses.
VOLTAGE SELECT SWITCH
(only on 230V/240V models) This switch is used to select the mains voltage for your region.
Always replace the fuse with one of the same
value and type.
(OPTIONAL) TONE MODULE
These terminals are for use with an optional tone module (not supplied).
7
1237456

INSTALLATION
PAGE 6 AMC SERIES INSTALLATION & OPERATION MANUAL
MOUNTING
When rack mounting, it is advisable to allow 1 rack space above and
below the amplifier. When multiple amplifiers are mounted in a rack,
exhaust fans should be used on the rack. Airflow for cooling the AMC30,
AMC60 & AMC120 is by convection from bottom to top. Airflow for cooling
the AMC250 is by fan from front to back.
OUTPUT CONNECTIONS
DIRECT OUTPUT
The output terminal strip accepts wire sizes from 16-22AWG
(1.5mm2 – 0.35mm2) or spade lugs.
The following table should be used as a guideline for cable sizes.
Regulations in your area may require different gauged wire and should
be checked before using.
OUTPUT DISTANCE WIRE SIZE
AMC30 AMC60 AMC120 AMC250
100V Up to 50m AWG26(0.12mm2) AWG26(0.12mm2) AWG24(0.2mm2) AWG22(0.35mm2)
50m–200m AWG24(0.2mm2) AWG20(0.5mm2) AWG18(0.75mm2) AWG16(1.5mm2)
Over 200m AWG20(0.5mm2) AWG18(0.75mm2) AWG16(1.5mm2) AWG13(2.5mm2)
70V Up to 50m AWG26(0.12mm2) AWG24(0.2mm2) AWG22(0.35mm2) AWG18(0.75mm2)
50m–200m AWG20(0.5mm2) AWG18(0.75mm2) AWG16(1.5mm2) AWG13(2.5mm2)
Over 200m AWG18(0.75mm2) AWG16(1.5mm2) AWG13(2.5mm2) AWG10(6.0mm2)
4 ohm Up to 10m AWG18(0.75mm2) AWG18(0.75mm2) AWG18(0.75mm2) AWG18(0.75mm2)
10m–30m AWG13(2.5mm2) AWG13(2.5mm2) AWG13(2.5mm2) AWG13(0.35mm2)
Over 30m Not Recommended Not Recommended Not Recommended Not Recommended
NOTE: Only connect one output - either Distributed Line
or Low Impedance.
LINE OUTPUT
he LINE output XLR can be used to connect up to 6 booster amplifiers. Balanced wiring
(shielded pair cable) is recommended.
NOTE: When wiring the LINE output as unbalanced, Pin2 should
be wired as hot and Pin1 should be wired as ground/shield.
Do not wire Pin3.
TAPE OUTPUT
The TAPE output wiring should be kept as short as possible.
INPUT CONNECTIONS
For wiring balanced in, pin 2 is hot. Unbalanced wiring on the microphone inputs is not
recommended. Balanced input wiring (shielded pair cable) is recommended.
Unbalanced RCA wiring should be keep as short as possible.

TROUBLESHOOTING GUIDE
TROUBLE LIKELY CAUSE REMEDY
Power LED not on Power not reaching amplifier Check power switch is on
Check mains connection
Check mains fuse
Distorted sound Output is short circuit Check speaker loads for shorts
Input is overloaded Reduce input level at source
Output is being over driven Reduce volume levels on front panel
Bass control is turned up Reduce Bass control level
No sound but amp is on Volume controls down Check volume controls
Amplifier has overheated Check for obstructions above and below
(AMC60, AMC120 AMC250 only) Make sure the amplifier is
well ventilated.
DC fuse(s) blown Refer product to local Australian Monitor dealer
No sound from channels 2 & 3 Priority function is being used Remove signal (disconnect input) from
channel 1 OR Disable priority function
(see Internal Adjustments)
Condenser microphone does not work Amplifier does not have phantom power Purchase an external power supply OR
Upgrade to the AMIS range of amplifiers
Tones do not sound when triggered Tone generator module not installed. Purchase optional Tone generator module
TROUBLESHOOTING & BLOCK DIAGRAM
PAGE 7
AMC SERIES INSTALLATION & OPERATION MANUAL

PAGE 8 AMC SERIES INSTALLATION & OPERATION MANUAL
FUNCTIONAL NOTES & INTERNAL ADJUSTMENTS
PRIORITY
Channel 1 will mute channels 2 and 3. This will only occur
when signal appears on channel 1, irrespective of the channel
volume control.
Priority can be disabled. (See below).
The release time is approx. 3 secs and is NOT adjustable.
The mute depth is approx. 40dB and is not adjustable.

PAGE 9
AMC SERIES INSTALLATION & OPERATION MANUAL
DIMENSIONS

SPECIFICATIONS
PAGE 10 AMC SERIES INSTALLATION & OPERATION MANUAL
AMC 30 AMC 60 AMC 120 AMC 250
POWER OUTPUT (0.5%THD, 1KHZ) 30W 60W 120W 250W
S/N RATIO > 75dBr > 75dBr > 80dBr >85dBr
POWER BANDWIDTH (-3DB +1DB) 85Hz-15kHz 75Hz-15kHz 75Hz-15kHz 30Hz-20kHz
FUSES MAINS (115V) 1.0A 3.15A 4A 6.3A
MAINS (230/240V) 0.5A 1.6A 2A 3.15A
DC 1.6A (x2) 4A 8A 10A (x2)
OUTPUT REGULATION 96% 93% 93% 90%
SIZE (WXHXD) 482x88x190mm 482x88x281mm 482x88x281mm 482x88x384mm
19”x3.5”x7.5” 19”x3.5”x11.1” 19”x3.5”x11.1” 19”x3.5”15.1”
NET WEIGHT 6.0kg 8.5kg 10.5kg 11.5kg
13.2lb 18.7lb 23.1lb 25.3lb
SHIPPING WEIGHT 7.5kg 10.5kg 12.5kg 14kg
16.5lb 23.1lb 27.6lb 30.8lb
SHIPPING DIMENSIONS (WXHXD) 510x145x297mm 525x175x385mm 525x175x385mm 525x185x470mm
20.1”x5.7”x11.7” 20.7”x6.9”x15.2” 20.7”x6.9”x15.2” 20.7”x7.3”x18.5”
MAINS CURRENT DRAW (240V)
FULL POWER 0.35A 0.66A 1.20A 2.53A
1/3 POWER 0.23A 0.44A 0.80A 1.61A
1/8 POWER 0.17A 0.32A 0.55A 1.10A
IDLE 0.08A 0.13A 0.15A 0.15A
MAINS CURRENT DRAW (115V)
FULL POWER 0.73A 1.38A 2.50A 5.28A
1/3 POWER 0.48A 0.92A 1.67A 3.36A
1/8 POWER 0.35A 0.67A 1.15A 2.30A
IDLE 0.17A 0.27A 0.31A 0.31A

SPECIFICATIONS
PAGE 11
AMC SERIES INSTALLATION & OPERATION MANUAL
AMC 30 AMC 60 AMC 120 AMC 250
THERMAL OUTPUT (W)
FULL POWER 38W 67W 128W 259W
1/3 POWER 33W 63W 118W 231W
1/8 POWER 26W 51W 91W 168W
IDLE 11W 19W 26W 26W
THERMAL OUTPUT (BTU/HR)
FULL POWER 130 229 437 884
1/3 POWER 113 215 403 788
1/8 POWER 90 172 311 573
IDLE 38 65 89 89
*1/3 and 1/8 power levels relate to voltage changes, not load changes.
COMMON TO ALL MODELS
THD (1KHZ, -1DB) better than 0.5%
MIC INPUT SENSITIVITY 1mV @ 200ohm
IMPEDANCE 1k3 ohm
HEADROOM 77mV (37dB)
AUX INPUT SENSITIVITY 0.5V+/@100kohm
IMPEDANCE >200kohm
HEADROOM > 15V (>30dB)
TONE CONTROL BASS @ 100HZ +/- 12 dB
TREBLE @ 10KHZ +/- 9 dB
LINE OUT NOMINAL OUTPUT 1V @ 1kohm
OUTPUT IMPEDANCE 100ohm
TAPE OUT NOMINAL OUTPUT 300mV @ 10kohm
OUTPUT IMPEDANCE 10kohm

SYDNEY
(NSW & ACT SALES)
149 Beaconsfield
Street Silverwater
NSW 2128
Private Bag 149
Silverwater NSW 1811
Phone: [phone]
Fax: [phone]
Email:
[email protected]
MELBOURNE
(VIC & TAS SALES)
22/277
Middleborough Road
Box Hill VIC 3128
PO Box 151 Blackburn
South VIC 3130
Phone: [phone]
Fax: [phone]
Email:
[email protected]
BRISBANE
(QLD SALES)
42 Commercial Road
Fortitude Valley
QLD 4006
PO Box 871 Fortitude
Valley QLD 4006
Phone: [phone]
Fax: [phone]
Email:
[email protected]
ADELAIDE
(SA & NT SALES)
31 Walsh Street
Thebarton
SA 5031
PO Box 157
Hindmarsh SA 5007
Phone: [phone]
Fax: [phone]
Email:
[email protected]
PERTH
(WA SALES)
299 Fitzgerald Street
West Perth WA 6005
PO Box 404
North Perth
WA 6906
Phone: [phone]
Fax: [phone]
Email:
[email protected]
AUCKLAND
(NZ SALES)
Unit B, 11 Piermark
Drive Albany 1331
New Zealand
PO Box 512
Albany 1331
Phone: [phone]
Fax: [phone]
Email:
[email protected]
AUSTRALIA AND NEW ZEALAND
www.australianmonitor.com.au
EUROPE / ASIA / MIDDLE EAST
www.australianmonitor.com.au
INTERNATIONAL SALES
149 Beaconsfield Street Silverwater NSW 2128 Australian
Private Bag 149 Silverwater NSW 1811
Phone: [phone]
Fax: [phone]
Email:
[email protected]
USA / SOUTH AMERICA
www.australianmonitor.com
SENNHEISER ELECTRONIC CORPORATION
1 Enterprise Drive
Old Lyme CT 06371 USA
Phone: [phone]
Fax: [phone]
Email: [email protected]