Rear Panel Connections - Redback A 4427 Operating Manual

5.0 REAR PANEL CONNECTIONS

Fig 2 shows the layout of the A 4427 rear panel.
24VDC
24VDC
Backup
Output
(120mA
Limited)
Micro
SD Card
+ _
24V DC In
16GB
- +
Interface Maximum
13 12 11
14 10
1 RCA Inputs
The line inputs are dual RCA connectors which are internally mixed to produce a mono input signal. The input
sensitivity of these inputs can be adjusted to 100mV or 1V via the DIP switches DIP1 - DIP7 (refer to DIP switch
settings).
2 Microphone Inputs
There are six microphone inputs which all incorporate a 5 way euro connector. Phantom power is available on
each Mic input and is selected via DIP switches on DIP1 - DIP6 (For more details see DIP switch settings).
A PTT connection is also available for PTT muting and a 24V DC (limited to 120mA current draw) output is
provided for each microphone for activation of external indicators. (The PTT and 24V DC OUT connections are
wired using the ground as a common connection).
3 Dip Switches DIP1 - DIP6
These are used to select various options such as phantom power on mic inputs, VOX options and input
sensitivities. Refer to DIP Switch Settings section.
4 Dip Switches DIP7
These are used to select the input sensitivities of the Line inputs 7 & 8. Refer to DIP Switch Settings section.
5 Tape Out
Dual RCA's provide a line level output for recording purposes or to pass the output on to another amplifier.
6 Preamp Out (Balanced Line Output)
A three pin 600 ohm 1V balanced XLR output is provided for passing the audio signal on to a slave amplifier
or to record the output of the amplifier.
7 Alert, Evacuation, Chime and Voice Over Message Volumes
Use these trimpots to adjust the output levels of the alert and evacuation tone and the chime and voice over
message.
8 Alert, Evacuation, chime and cancel contacts
Use these contacts to trigger the chime tones, the alert tone, the evacuation tone and to cancel any
of the tones once triggered. All tones & cancel function are operated by a closing contact to ground.
This could be triggered via building fire indicator board, break glass alarm etc.
9 DIP 8
These switches provide various play modes (see DIP switch settings for more details).
10 Micro SD Card
This is used to store the MP3 audio files for the Alert, Evacuation and Chime tones and the Voice Over message.
The Micro SD card needs to be pushed in to insert and to remove.
11 RJ45 Interface
This is for future expansion of product.
12 24V DC Out
This is a 24V DC output which is activated when any of the Alert, Evacuation or Chime triggers are operated. It
also becomes active when any of the VOX circuits are enabled or any of the PTT muting is activated.
13 24V DC Input (Backup)
Connects to a 24V DC backup supply with at least 1 amp current capacity. (Please observe the polarity)
14 24V DC input
Connects to a 24V DC Plugpack with 2.1mm Jack.
www.altronics.com.au
Redback® A 4427 8 Channel Public Address Mixer
Output Tape Out
ALERT/EVAC/CHIME
Triggers
MODULE
1 2
Output
Levels 3
Chime Voice Alert
Over /Evac
9 8 7
6 5
L L L
Line 8 Line 7 Line 6
Line 5
R R R
4
Fig 2
1
L L L L L
Line 4 Line 2
Line 3
R R R R R
2
3
Redback® Proudly Made In Australia
L
Line 1
R
5