User Manual

www.redbackaudio.com.auRedback® Proudly Made In Australia18
Redback® A 4275C/85C 125/250W Mixer Amplier
Setup
2.8 Pre-Amp Out, Tape Out, Send & Return
Pre-Amp Out
A 3 pin 600ohm 1V balanced XLR output is provided for passing the audio signal on to other slave ampliers or to record
the output of the amplier. This output can be set up to be effected (post master volume) by the master volume control or
unaffected (pre master volume). Factory default setting disables the preout. (Refer to section 2.3 DIP switch settings).
Tape Out
Dual RCA’s are provided for the “Tape Out” connection for recording purposes. This level is post master volume so it is
affected by the master volume.
Send and Return
RCA connectors are provided for the send and return audio paths. This allows external effects units, ie Graphic EQ’S ,
companders or signal processors to be connected to the amplier. When not using this feature the send and return
outputs must be linked externally (this is factory tted). The amplier will not work without this link. Only when an
external effects unit is used can it be removed.
Fig 2.8 illustrates the connections required for a slave amplier, a recording unit and an effects unit.
Fig 2.8
4 -16Ω70V100V
OUTPUTS
L
R
24V DC IN
Balanced Mic
+
_
PTT
(short to
activate)
Power Fail
(Contacts
close on
power fail)
SendReturn
Tape Out
Preamp Out
Link To Charge
Backup battery
Input 1Input 3 Input 2Input 4Input 5Input 6
ALERT - EVAC MODULE
Output Levels
Voice Chime Alert
Over & Evac
EV
COMCANCH
AL
Triggers
L
R
+
–
Rem. Vol
Connect
to 1KΩ Pot
+
–
+
–
+
–
Line
24V DC
Switched
Output
DIP 5
Interface
DIP 4
DIP 1
DIP 2DIP 3
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Line
L
R
L
R
L
R
L
R
L
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
1 2
3
1 2 3 4 5 6 7 8
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
230V AC @ 50Hz
www.altronics.com.au
RESETTABLE
DC FUSE
Made in Australia
by Altronic
Distributors
Pty Ltd
DIP 5
DIP 4
IMPORTANT NOTE
Ensure power is switched OFF when
adjusting DIP switches. New
settings will be effective when
power is switched back on.
DIP 3
SW Item On Off
1
2
Input 6 Level 1V 100mV
3
Not USed
4 Input 5 Level 1V 100mV
Not USed
1
2
3
4
DIP 2
SW Item On Off
Input 4 Level 1V 100mV
Not USed
Input 3 Level 1V 100mV
Input 3 Priority On Off
*
DIP 1
SW Item On Off
1
2
Input 2 Level 1V 100mV
3
Input 2 Priority On Off
4 Input 1 Level 1V 100mV
Input 1 Priority On Off
*
*
SW
Item On
Off
1
2
3
4 Not Used
Not Used
Not Used
Not Used
DIP 4
DIP 1
DIP 2DIP 3
SW
Item On Off
Switched 24VDC Out On Off
Phantom Power Input 6 On Off
On Off
1
2
3
4
Phantom Power Input 5
On Off
5
Phantom Power Input 4
On Off
6
Phantom Power Input 3
On Off
7
Phantom Power Input 2
On Off
8
Phantom Power Input 1
Preamp Out †
Post
Pre
†
Sets the Preamplifier output to
Pre or Post Master.
DIP 5
Priority or VOX muting is only
functional on inputs 1-3. When
VOX is enabled on input 1 it will
override all other inputs includ-
ing the Alert/Evac Module. VOX
enabled on input 2 will override
inputs 3-6. VOX enabled on input
3 will override inputs 4-6.
If the Alert/Evac module is fitted
it will override inputs 2-6.
*
Model
125W
5AAC Fuse
250W
7.5A
AC Fuse Ratings
RISK OF ELECTRIC SHOCK
OPEN BY QUALIFIED
PERSONNEL ONLY
!
CAUTION
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



POWER
REDBACK
A 4270 125W
Public Address Amplifie
PHASE
5
SLAVE AMPLIFIER
EFFECTS UNIT
RECORDER