AUSTRALIAN MONITOR AMIS480P User manual

4 x 80 WATT LINE AMPLIFIER
INSTALLATION AND OPERATION MANUAL
AMIS480P

AMIS480P INSTALLATION & OPERATION MANUAL PAGE 3
INTRODUCTION AND CONTENTS
The Australian Monitor Installation Series AMIS480P is a robust, highly
featured 4 channel power amplifier.
Offering 4 independent channels, each delivering 80 watts into 4 ohms
or 70/100 volt line, the AMIS480P is designed to operate in extreme
conditions to give the contractor the most reliable 4 channel amplifier
available today.
Engineered with maximum attention to channel isolation, with
individual ground lift switches and level control for each channel,
the AMIS480P will operate as 4 individual amplifiers in a rack space
friendly, 2RU chassis.
For ease of installation, each channel input can be routed to the next
channel via rear panel link switches, eliminating the need for daisy
chaining or Y-split cables. The AMIS480P also offers signal present
and clip LED indicators for each channel as well as a thermal
protect indicator.
The AMIS480P is a significant advance in 4 channel amp design
offered at a contractor friendly price.
INTRODUCTION 3
FRONT PANEL 4
BACK PANEL 5
INSTALLATION 6
SETUP & TROUBLESHOOTING 7
DIMENSIONS 8
BLOCK DIAGRAM 9
SPECIFICATIONS 10
This symbol is intended to alert the user to the presence
of uninsulated “dangerous voltage” within the product’s
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 operation 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:
AUS, EUR, USA
Copyright 17th Oct 2004
Rev A: 17th Oct 2004

STATUS
This LED indicates OUTPUT signal level
for each channel.
Green: -23dB (below rated power)
Red: 0dB (rated power, clip)
Due to the nature of distributed audio
and line transformers, this LED functions
as a peak indicator. Some flashing of red
is acceptable on program transients.
Continuous flashing of red could be
placing undue stress on the amplifier
due to external speaker transformer
saturation.
THERMAL
This LED will illuminate when the amplifier
has overheated. Overheating will mute all
channels.
If the amplifier shuts down because it has
overheated, there may be a problem with
the installation. See Troubleshooting
section.
POWER
This switch switches power on or off from
the mains input.
NOTE: When using the ‘24VDC IN’
binding posts, the amplifier is ‘on’
regardless of the switch position.
ON
This LED indicates if the amplifier is
powered ‘on’.
NOTE: When using the ‘24VDC IN’
binding posts, the amplifier is
always ‘on’ and the power LED
will always be on regardless of
the position of the power switch.
AIR INTAKE VENTS
These vents allow fan assisted air flow
into the amplifier to cool the heatsinks.
These should be kept free from obstruc-
tion. The air flow is from front to rear.
☛
☛
PAGE 4 AMIS480P INSTALLATION & OPERATION MANUAL
FRONT PANEL
12
3
4
5
2 3 514

AMIS480P INSTALLATION & OPERATION MANUAL PAGE 5
BACK PANEL
IEC MAINS INPUT SOCKET
This is a standard IEC 3 pin socket.
It accepts a standard IEC mains cable,
provided. The fuse draw contains the
mains fuse and a spare.
The mains fuse is:
• 230V/240V model -
Time lag (slow 6.3A blow) HRC
20mm x 5mm ceramic type.
• 115V model -
Time lag (slow 10A blow) HRC
20mm x 5mm ceramic type.
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.
Disconnect power to the amplifier
before operating this switch.
24VDC
These binding posts provide connection
for an external 24V emergency power
systems and are not switched by the
front panel power switch. The 24VDC IN
does NOT provide any trickle charge
facility.The binding posts can accommo-
date a wire thickness of up to 4mm in
diameter. The maximum current draw at
24VDC is 18A with peaks up to 25A.
INPUT
These 3 pin XLR sockets accept the
source input for each channel. When
wiring from unbalanced sources, pins
1 and 3 should be shorted together
(see Installation section). The input
sensitivity (voltage required to drive
amplifier to maximum power) of the
amplifier is 0dBu (0.775V) with the
Input Level Control set at maximum.
LEVEL
These pots control the level of the signal
through the amplifier channel. Minimum
position is Off and maximum gives a
sensitivity of 0.775V (0dBu). The maximum
input voltage before the input stage clips
is 2.9V (+11.5dBu).
Depending on the input
source, the input level
control should be run above
the 12 o’clock position (half
way) to avoid clipping the input stage.
LINK SWITCH
These switches change the input source
of an amplifier channel from the XLR input
connector to the linked channel. The
switch is positioned before the amplifier
channel volume control, so only the
individual channel is affected by volume
control changes. See Installation - Setup.
NOTE: Please ensure the link
switches are in the desired
position before power-up.
GND LIFT
These DIP switches are used to individu-
ally lift pin1 of each input. Reading from
left to right, these switches affect
channels 4, 3, 2, 1. The ground is not
completely removed but stays tied to
ground through a 10Ωresistor. This is to
avoid speaker and amplifier damage if an
incorrectly wired (pin 3 floating) unbal-
anced signal is connected and the ground
is inadvertently lifted.
OUTPUT
There is one 6 pole terminal strip for each
channel. Each channel has a low impedance
output and a distributed line voltage output.
70V out is available on 115V models.
100V out is available on 230V/240V models.
MINIMUM IMPEDANCE
Distributed Line Output
70V (115V version) 62.5Ω
100V (230/240V version) 125Ω
Low Impedance Output
(both versions) 4Ω
NOTE: Only connect one output -
either Distributed Line or Low
Impedance per channel. Do not
connect LowZ and 100V at the
same time.
Each channel output strip comes fitted
with a touch-proof cover held in place by
two M3 machine screws with flat and
spring washers.
EXHAUST VENTS
These vents allow hot air to escape from
the amplifier. There are also vents along
the side of the amplifier. These should be
kept free from obstruction.
☛
☛
1
2
3
3 45 67 91
4
5
6
7
8
9
28

PAGE 6 AMIS480P INSTALLATION & OPERATION MANUAL
INSTALLATION
MOUNTING
When rack mounting, allow at least 45mm (1.14”) between the sides of
the amplifier and the sides of the rack.
The front of the amplifier should be left clear and free to draw air. Airflow
for cooling the amplifier is front to rear.
OUTPUT CONNECTIONS
The output terminal strip accepts wire sizes from 16-22AWG
(1.5mm2 - 0.35mm2).
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.
INPUT CONNECTIONS
When wiring balanced in, pin 2 is hot.
When wiring unbalanced in, pin 2 is hot and pin 1 and pin 3 should be
shorted together to the shield.
Balanced input wiring (shielded pair cable) is recommended.
OUTPUT TYPE DISTANCE WIRE SIZE
100V Up to 50m AWG25-26 (0.15mm2)
50m - 200m AWG20 (0.5mm2)
Over 200m AWG18 (0.75mm2)
70V Up to 50m AWG24 (0.20mm2)
50m - 200m AWG17 (1.0mm2)
Over 200m AWG16 (1.5mm2)
Low Impedance (4Ω) Up to 10m AWG18 (0.75mm2)
10m - 30m AWG13 (2.50mm2)
Over 30m Not Recommended
NOTE: Only connect one output - either Distributed Line or Low Impedance per channel.
☛

AMIS480P INSTALLATION & OPERATION MANUAL PAGE 7
SETUP
Each channel of the AMIS480P can be wired individually to suit multi-
zone systems. If more than one zone is to receive the same signal, it
can be easily routed to the next channel of the amplifier using the LINK
switches. The channel being linked receives the input signal from the
previous channel. The previous channel may be receiving signal from
its own input or the signal coming from the previous channel. The
volume control only affects the amplifier output, not the input level.
SETUP & TROUBLESHOOTING
TROUBLESHOOTING GUIDE
TROUBLE LIKELY CAUSE REMEDY
Power LED not on Power not reaching amplifier Check mains connection or DC connection
Check mains fuse
Check power switch is on
Thermal indicator on Speaker load bad Check the speaker loads
Amplifier not able to cool itself Check for blockages around the intake grills and
exhaust grills on the rear and sides of the amplifier
Make sure the amplifier has a source of cool air
Distorted sound Output is short circuit Check speaker loads for shorts
Input is overloaded Reduce input level at the source
No sound but amp is on DC fuse(s) blown Refer product to local Australian Monitor dealer
LINK switch is in Check LINK switch position
Channel volume down Check channel volume
Some channels not working with Channel volume down Check channel volume
linked source

PAGE 8 AMIS480P INSTALLATION & OPERATION MANUAL
DIMENSIONS

AMIS480P INSTALLATION & OPERATION MANUAL PAGE 9
BLOCK DIAGRAM

PAGE 10 AMIS480P INSTALLATION & OPERATION MANUAL
SPECIFICATIONS
OUTPUT POWER (1% THD, all channels driven) 4 x 80W
FREQUENCY RESPONSE (1W) 80Hz - 20kHz
POWER BANDWIDTH (-3dB) 85Hz - 20kHz
THD (1kHz, -3dB) Less than 0.5%
S/N RATIO 94dB (ref 100V)
CROSSTALK
1kHz 80dB
20Hz - 20kHz Better than 60dB
INPUT SENSITIVITY 0.775V RMS (0dBu)
INPUT IMPEDANCE 20KΩ
VOLTAGE GAIN (pot at max)
100V out 129 (42dB)
70V out 90 (39dB)
4Ωout 23 (27dB)
OUTPUT REGULATION (1kHz) 95%
DIMENSIONS (h x w x d) 88mm x 483mm x 432mm
(4.36” x 19” x 17”)
WEIGHT 20kg (44lb)
SHIPPING DIMENSIONS (h x w x d) 230mm x 540mm x 550mm
(9.1” x 21.3” x 21.7”)
SHIPPING WEIGHT 24kg (53lb)
ALL CHANNELS DRIVEN
CURRENT DRAW Mains Mains 24VDC IN
(230/240V) (115V)
IDLE 0.08A 0.17A 0.7A
1/8TH POWER 1.0A 2.1A 8.7A
1/3RD POWER 1.5A 3.1A 14.2A
FULL POWER 2.7A 5.7A 18.35A
ALL CHANNELS DRIVEN
THERMAL OUTPUT Watts BTU/Hr
IDLE 17W 58
1/8TH POWER 150W 512
1/3RD POWER 160W 546
FULL POWER 250W 854

SYDNEY
(NSW & ACT SALES)
149 Beaconsfield
Street Silverwater
NSW 2128
Private Bag 149
Silverwater NSW 1811
Phone: [phone]
Fax: [phone]
Email:
n[email protected]
MELBOURNE
(VIC & TAS SALES)
122/277
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:
[e-mail]
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
INTERNATIONAL SALES
149 Beaconsfield Street Silverwater NSW 2128 Australia
Private Bag 149 Silverwater NSW 1811
Phone: [phone]
Fax: [phone]
Email: [e-mail]
SENNHEISER ELECTRONIC CORPORATION
1 Enterprise Drive
Old Lyme CT 06371 USA
Phone: [phone]
Fax: [phone]
Email: [email protected]
EUROPE/ASIA/MIDDLE EAST
www.australianmonitor.com.au
USA/SOUTH AMERICA
www.australianmonitor.com