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Redback® Proudly Made In Australia
9
Redback® A 4480B
8 In to 8 Out Audio Switcher
7
XLR line inputs
inputs 1 & 2 female XLR inputs.
8
XLR input phantom power settings
Phantom power can be applied to the XLR inputs via DIP switch 3. Refer to Fig 1.5c.
9
Optional Dip Switch Settings
Currently not used
10
Emergency input settings DIP switches
Change the sensitivity of the 3 pin emergency XLR from balanced mic level to balanced line level. Also selectes
phantom power to this input. See fig 1.5d.
11
Male XLR balanced line output connectors
Connect these outputs (1-8) to the zone amplifiers. Use a 3 pin female XLR connector (pin 1 GND, pin 2 Cold,
pin 3 Hot).
12
Emergency microphone female 3 pin XLR socket
Use this input for emergency or “all call” paging. This has overall priority and goes to all zones. This input is
suitable for connection to the output of a building EWIS system allowing remote paging and alert/evac tones to
be transmitted on an “all call” basis. Sensitivity can be set to mic (0.3V) or line level (0.7V) using the DIP
switch. See SW5 in fig1.5d for details.
13
RJ45 connectors for preset plate or paging consoles
These RJ45 ports connect to the A 4481 zone paging consoles or A 4476 preset plate.
NOTE: A maximum of eight A 4481 mic consoles and a single A 4476 preset plate may be used at the same time.
In this case only seven A 4475 zone wallplates can be used. The A 4476 will operate in any “Zone wall plate” or
“Paging console” RJ45 port.
14
Emergency input Vox Level
Use
this trimpot adjustment to change the vox level for the emergency mic input.
15
Priority input Volume
Use
this trimpot adjustment to change the output level of the priority input.
16
Pririty input trigger
Use this contact to trigger the priority input.
17
Priority Input RCA Connectors
Connect this input to an input audio source such as telephone paging, or special event player such as the playing
of the “ODE”. This inputs is converted to mono internally.
18
Priority Input Vox Level
Use this trimpot adjustment to change the vox level for the priority input.
19
RJ45 connectors for zone wall plates
These RJ45 ports connect to the A 4475 remote zone wallplates, if used.
Overview
1 2 3 4
Input 1 & 2 XLR
SW3
SW
ON OFF
Phantom Power
(1) Input 1
ON OFF
(2) Input 2 ON OFF
(3) Not Used
(4)
Not Used
Dip Switch 3 Settings
ON
1 2 3 4
Fig 1.5c
1 2 3 4
SW5
ON
OFF
1 Phantom Phantom
Power On Power Off
2
Mic Level Line Level
Switches 3 & 4 Not Used
SW5
ON
1 2 3 4
Fig 1.5d
