User Manual

www.redbackaudio.com.auRedback® Proudly Made In Australia8
Redback® A 4270/80 Four Zone Paging PA Amplier
10.0 SPEAKER CONNECTIONS
Speakers fitted with 100V line transformers may be connected to the output terminals on the rear of the amplifer. Always
ensure the total load of the fitted speakers does not exceed the rated output of the amplifier (ie 125 watts for the A 4270
and 250 watts for the A 4280 amplifier) otherwise damage may result. When fitting speakers with line transformers the
impedance of the load cannot be measured using a standard multimeter. An impedance meter (such as the Altronics
Q 2004) is required. Fig 5 lists the impedance at certain loads of speakers fitted with 70V and 100V line transformers. So
for a total load of 125 watts using 100V line transformer fitted speakers, the impedance of the speaker load should be
80Ω.
Fig 6 shows a typical install where the A 4270 has all ve outputs connected to 100V line speakers and two Redback®
A 4488 Paging consoles connected to the RJ45 ports.
NOTE: The total load of all speakers must not exceed the total load rating of the amplier.
Audio from the amplier is output to the main 100V Out terminals and is not affected by the A 4488 paging consoles.
The audio from the amplier can also be piped to any of the 100V zone outputs 1- 4 and used as background music
to that zone. This is achieved by pressing the “BGM Output Select” switches on the front of the amplier. If paging is
required to these zones then the Redback® A 4488 paging consoles can be connected as shown. The paging consoles
provide paging to all four output zones and will override the background music to those zones (refer to section 13.0 for
more details).
Fig 6
RJ45 cabling conguration (586A ‘Straight through’)
The A 4488 paging consoles are connected to the amplier using “pin to pin” conguration RJ45 data cabling as shown
in g 7. When installing ensure all connections are veried with a LAN cable tester before switching any system
component on.
Failure to follow the correct wiring conguration may result in damage to system components.
and will Void the warranty.
Fig 7
240V AC @ 50Hz
RISK OF ELECTRIC SHOCK
OPEN BY QUALIFIED
PERSONNEL ONLY
!
CAUTION
Tape Out
Line 1
Mic 3 Mic 2
Mic 1
12
3
1 • Shield
2 • Hot
3 • Cold
MIc XLR
wiring
Configuration
Line 2
Line 3
L
R
L
R
L
R
Output
125W
Fuse
5 Amp
7.5 Amp
250W
AC Fuse (M 205)
DC FuseOutput
125W 10 Amp
20 Amp
250W
Resettable
DC Fuse
L
R
Optional
Plugin
- +
+
_
24V
DC IN
Made in Australia by
Altronic Distributors Pty Ltd
www.redbackaudio.com.au
CH1
COM
CAN
EV
(MAIN)
- +
+
_
AL
CH2
Evac
Volume
V/Over
Volume
Chime
Volume
DIP
Switches
To Paging
Console 1
To Paging
Console 2
(16GB
Maximum)
Micro SD Card
Output
Triggers
Levels
+
_
+
_
+
_
+
_
1 2 3 4
2 1
3
2 1
3
2 1
3
4 Zone Communicator
System Busy
Page
Lock On
All Call Cancel
A 4488
4 Zone Communicator
System Busy
Page
Lock On
All Call Cancel
A 4488
CAT5e cable
Max 300M
Speakers fitted with
100V line transformers.
Main 100V Out
100V
Out 4
100V
Out 3
100V
Out 2
100V
Out 1
The total speaker load must not exceed
the rated output of the amplifier.
A 4270 - 125 Watts
A 4280 - 250 Watts
568A
1 RX+
2 RX-
3 TX +
4
5
6 TX-
7
8
Straight Through
(both ends)
Pins Face Upwards
1 TX+
2 TX-
3 RX +
4
5
6 RX-
7
8