Redback A 4435 User manual

Redback® A 4435 Mixer 4 Input & Message Player
User manual revision number: 1.0 10/08/2018
Operating Manual
A 4435 4 CHANNEL MIXER WITH MESSAGE PLAYER
IMPORTANT NOTE:
Please read these instructions carefully from front to back prior to installation.
They include important setup instructions.
Failure to follow these instructions may prevent the unit from working as designed.
Redback® Proudly Made In Australia
Distributed by Altronic Distributors Pty. Ltd.
Phone: [phone] Fax: [phone] Internet: www.altronics.com.au
MIXER 4 CHANNEL WITH MP3
BASED MESSAGE PLAYER

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Redback® A 4435 Mixer 4 Input & Message Player
REDBACK is a registered trademark of Altronic Distributors Pty Ltd
Since 1976 Redback ampliers have been manufactured in Perth, Western Australia by Altronics. With close to 40 years
experience in the commercial audio industry, we offer consultants, installers and end users reliable products of high build
quality with local product support. We believe there is signicant added value for customers when purchasing an
Australian made Redback amplier or PA product
Australian Made Status
All Redback house products made by Altronics will now be sporting the ofcial Australian Made logo. Since starting manu-
facturing of commercial audio equipment in the mid 70’s we have always taken pride in producing a quality local product.
The new adoption of the Australian Made logo will help us get the word out to local and export markets that our
products carry the ofcial compliance seal of the Australian Made campaign. We have always pushed our ‘local is better’
line in all of our marketing efforts, it’s always an added boost when you are backed up by a widely recognised and
respected icon.
Industry leading 10 year warranty.
There’s a reason we have the industry leading DECADE warranty. It’s because of a long tried and tested history of
bulletproof reliability. We’ve heard PA contractors tell us they still see the original Redford amplier still in service in schools
- that’s over 39 years of operation - and still going strong!
Published by Altronic Distributors
© 2018 Altronic Distributors

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Redback® A 4435 Mixer 4 Input & Message Player
CONTENTS
1.0 Overview Page
1.1 Introduction 4
1.2 Features 4
1.3 What’s in the box 4
1.4 Front panel guide 5
1.5 Rear panel connections 6
2.0 Setup
2.1 MP3 File Setup 7
2.2 Power Connections 9
2.3 Audio Connections 9
2.4 DIP Switch settings 10
3.0 Troubleshooting 10
4.0 Firmware Update 11
5.0 Specications 11
Contents

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Redback® A 4435 Mixer 4 Input & Message Player Overview
1.0 OVERVIEW
1.1 INTRODUCTION
This unique Redback PA mixer features four input channels which are user selectable for either balanced mic, line or aux-
iliary use. In addition it incorporates a four channel SD card based message player making it an excellent choice for retail,
supermarkets, hardware stores and more.
The mixer could be used for general paging and BGM applications, and the message player for customer service applica-
tions, in-store advertising or for pre-recorded commentary at galleries, display stands etc.
The message player and each input all have individual level, treble and bass controls. Vox muting is provided for channels
one and two with front panel adjustable sensitivity. The message player has priority and slots in between input one and
two. Custom messages, tones and music may be loaded onto the message player SD card. The messages are activated by
a closing set of contacts. If input one is active when a message contact is closed, the message is queued and played once
input one is no longer in use.
Messages are played on a rst in, best dressed (FIBD) basis, and will also be queued if one message is playing and another
is activated. Input four is also tted with a 3.5mm jack input for connection to a smartphone/tablet as an audio source.
When connected, this overrides any source connected to input 4 on the rear panel. Each input has a 3 pin XLR (2mV) and
stereo RCA socket with adjustable sensitivity settings. These can be set 100mV or 1V for the stereo RCAs. Message player
contacts are provided via pluggable screw terminals. 24V DC operation from the included power supply or battery backup.
1.2 FEATURES
• Four input channels
• SD card message player for audio announcements
• Individual level, bass and treble control on all inputs
• 3.5mm music input
• Adjustable input sensitivity on mic or line
• 24V DC battery back up terminals
• Four sets of closing contacts for message triggering
• 24V DC switched output
• Message active indicators
• Adjustable Vox sensitivity
• 10 Year Warranty
• Australian Designed and Manufactured
1.3 WHAT’S IN THE BOX
A 4435 Mixer 4 Channel with MP3 Message player
24V 1A DC Plugpack
Instruction Booklet

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Redback® A 4435 Mixer 4 Input & Message Player
Fig 1.4 shows the layout of the A 4435 front panel.
Fig 1.4
1 Inputs 1-4 volume controls
Use these controls to adjust the output volume, bass and treble of inputs 1-4.
2 MP3 volume control
Use these controls to adjust the output volume, bass and treble of the MP3 audio.
3 Master Volume
Use these controls to adjust the output volume, bass and treble of the master volume.
4 Active Message Indicators
These LED’s indicate which MP3 message/audio le is active.
5 Standby Switch
When the unit is in standby mode this switch will illuminate. Press this button to switch the unit ON. Once the
unit is ON the On indicator will illuminate. Press this switch again to put the unit back in standby mode.
6 On/Fault Indicator
This led indicates when the unit has power if the LED is blue. If the LED is red a fault has occured with the unit.
7 SD Card
This is used to store the MP3 audio les for the message/audio playback. Note the unit is supplied with a tamper
cover so that the SD card is not easily removed. The SD card may need to be pushed in with a screwdriver to insert
and to remove because of the depth of the socket.
8 Output Active Indicator
This led indicates when the unit has an input signal present.
9 Music input
This input will override input 4 when connected. Use this for connection of portable music players.
(Note: switch 1 on DIP4 must be set to ON to enable this function).
10 VOX 1 Sensitivity
This sets the VOX sensitivity of input 1. When the VOX is active on input 1, inputs 2-4 are muted.
11 VOX 2 Sensitivity
This sets the VOX sensitivity of input 2. When the VOX is active on input 2, inputs 3-4 are muted.
1.4 FRONT PANEL GUIDE
Overview
Standby
Master Volume
SD Card
Treble Bass
4 Channel Mixer
A 4435
0
2
46
8
10
Vox 1
Sens.
Music
Input
Vox 2
Sens.
Volume 1
Treble Bass
Volume 2
Treble Bass
Volume 3
Treble Bass
Volume 4
Treble Bass
MP3
Output
Active
1 2 3 4
Message Active
Fault
On
12 3 5
6
4
7891011
0
2
46
8
10 0
2
46
8
10 0
2
46
8
10 0
2
46
8
10 0
2
46
8
10

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Redback® A 4435 Mixer 4 Input & Message Player
1.5 REAR PANEL CONNECTIONS
Fig 1.5 shows the layout of the A 4435 rear panel.
Fig 1.5
1 Microphone Inputs
There are four microphone inputs which all incorporate a 3 pin balanced XLR. Phantom power is available at
each Mic input and is selected via DIP switches on DIP1 - DIP4 (For more details see DIP switch settings).
2 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.
3 Dip Switches DIP1 - DIP4
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 Preamp Out (Balanced Line Output)
A 3 pin 600ohm 1V balanced XLR output is provided for passing the audio signal on to a slave amplier
or to record the output of the amplier.
5 Line Out
Dual RCA’s provide a line level output for recording purposes or to pass the output on to another amplier.
6 Remote triggers
These contacts are for remote triggering of the internal MP3 player. There are four contacts which correspond to
the four MP3 les stored in the trigger folders of the SD card.
7 DIP 5
These switches provide various play modes (see DIP switch settings for more details).
8 Switched Out
This is a 24V DC output which is activated when any of the remote triggers are operated. The terminals provided
can be used for “Normal” or “Failsafe” modes. The output terminals have a N/O (normally open), N/C (normally
closed) and a ground connection. In this conguration 24V appears between the N/O and ground terminals when
this output is activated. When this output is not active 24V appears between the N/C and ground terminals.
9 24V DC Input (Backup)
Connects to a 24V DC backup supply with at least 1 amp current capacity. (Please observe the polarity)
10 24V DC input
Connects to a 24V DC Plugpack with 2.1mm Jack.
Overview
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Made in Australia
by Altronic Distributors Pty Ltd
Input 1
L
R
MicLine
+
-
24V DC In
- +
+_
24V DC
Backup
Dip 1
Input 2
L
R
Mic Line Dip 2
Input 3
L
R
Mic
Line
Dip 3
Input 4
L
R
Mic Line Dip 4
N/C
N/O
Switched
24V Out
Trigger 4 Trigger 3 Trigger 2 Trigger 1
Output
L
R
MicLine
Dip 5
1 2 3 4 5 6 7 81 2 3 4 1 2 3 4 5 6 7 8
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
6
8
9
10 4
5
7
3
2
1

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Redback® A 4435 Mixer 4 Input & Message Player
Setup
2.0 SETUP GUIDE
2.1 MP3 FILE SETUP
The MP3 audio les are stored on an SD card which is located on the front of the unit as shown in gure 1.4.
These MP3 audio les are played when the triggers are activated.
These MP3 audio les can be removed and replaced with any MP3 audio le (Note: The les must be in MP3 format), wheth-
er it be music, a tone, a message etc.
The audio les are located in four folders labelled Trig1 to Trig4 on the SD card as shown in gure 2.1.
A library of MP3 tones are also supplied in the folder labelled #LIBRARY#.
In order to put MP3 les onto the SD card, the SD card will need to be connected to a PC. You will need a PC or laptop
equipped with a SD card reader to do this. If a SD slot is not available then the Altronics D 0371A USB Memory Card Reader
or similar would be suitable (not supplied).
You will rst need to remove power from the A 4435 and then remove the SD card from the front of the unit. To access the
SD card, push the SD card in so that it pops back out, and then remove the card.
Step by step guide to put an MP3 into it’s associated folder with a Windows installed PC.
Step 1: Make sure the PC is on and card reader (if required) connected and correctly installed. Then insert the SD card into
the PC or the reader.
Step 2: Go to “My Computer” or “This PC”and open the SD card which is usually marked “Removable disk”.
In this example it is named “USB Drive (M:)”.
Select the removable disk and then you should get a window that looks like gure 2.1.
Fig 2.1
The #LIBRARY# folder and the four trigger folders are now visible.
Step 3: Open the folder to change, in our example the “Trig1” folder, and you should get a window that looks like gure 2.2
Step 4: You should see an MP3 le “1.mp3”.

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Redback® A 4435 Mixer 4 Input & Message Player
Fig 2.2
This MP3 le needs to be deleted and replaced by the MP3 le you want to play when you the rear Trigger 1 contact. The
MP3 le name is not important only that there is only one MP3 le in the “Trig1” folder. Make sure you delete the old MP3!
NOTE the new MP3 le cannot be “Read only”. To check this
right click on the MP3 le and scroll down and select Prop-
erties, you will get a window that looks like gure 2.3. Make
sure the “Read Only” box has no tick in it.
Repeat these steps for the other folders as required.
The new MP3’s are now installed on the SD card, and the SD
card can be removed from the PC following windows safe
card removal procedures.
Make sure the A 4435 is not powered and insert the SD card
into the SD card slot ; it will click when fully inserted.
The A 4435 can now be powered back on.
Fig 2.3
Setup

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Redback® A 4435 Mixer 4 Input & Message Player
Setup
2.2 POWER CONNECTIONS
A DC socket and a 2 way terminal have been provided for 24V DC input.
The DC socket is for connection of the supplied plugpack which comes with a standard 2.1mm jack connector. The socket
also has a threaded connector so that the Altronics P 0602 (shown in FIg 2.4) could be used. This connector eliminates
accidental removal of the power lead.
The 2 way terminal is for connection of a backup power supply or battery.
Fig 2.4
2.3 AUDIO CONNECTIONS
Fig 2.5 demonstrates a simple example of the A 4435 in use in a department store. The XLR output of the mixer is fed
into an amplier which in turn connects to speakers throughout the store. A background music (BGM) source is fed into
the line level RCA’s of input 2. A microphone at the front desk is connected to input 1, and has vox priority turned on via
the DIP1 switches. Any time the microphone is used the BGM will be muted. A security message is played randomly, set
off by a timer which is connected to trigger 1 and plays an MP3 “Security to the front of the store”. The paint section in
the store has a “Assistance Required” button, which when pressed activates trigger two and plays an MP3 “Assistance re-
quired in the paint section”. The output of the mixer is connected to a recorder which keeps a record of everything output
from the system including anything said into the microphone.
Fig 2.5
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Made in Australia
by Altronic Distributors Pty Ltd
Input 1
L
R
MicLine
+
-
24V DC In
- +
+_
24V DC
Backup
Dip 1
Input 2
L
R
Mic Line Dip 2
Input 3
L
R
Mic
Line
Dip 3
Input 4
L
R
Mic Line Dip 4
N/C
N/O
Switched
24V Out
Trigger 4 Trigger 3 Trigger 2 Trigger 1
Output
L
R
MicLine
Dip 5
1 2 3 4 5 6 7 81 2 3 4 1 2 3 4 5 6 7 8
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
24V DC Plugpack
(such as Altronics M 8968B supplied)
+
-
Altronics P 0602
2.1mm DC Plug with collar
(Not supplied)
POWER
REDBACK
A 4270 125W
Public Address Amplie
PHASE5
SLAVE AMPLIFIER
RECORDER
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Input 1
L
R
MicLine
+
-
24V DC In
- +
+_
24V DC
Backup
Dip 1
Input 2
L
R
Mic Line Dip 2
Input 3
L
R
Mic
Line
Dip 3
Input 4
L
R
Mic Line Dip 4
N/C
N/O
Switched
24V Out Trigger 4 Trigger 3 Trigger 2 Trigger 1
Output
L
R
MicLine
Dip 5
1 2 3 4 5 6 7 81 2 3 4 1 2 3 4 5 6 7 8
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
MICROPHONE
AT FRONT DESK
CD
REDBACK
LINE LEVEL AUDIO SOURCE
7 Day 24 Hour Timer
MenuUp Down Enter+10
ZONE MODE
ManualMode
AutoMode
PressZone buttons to
changeZone Mode
S 0080
24VDC
Input
24VDC
Input
+-
DIP Switches Under
Zone1 Zone2 Zone3 Zone 4
OUTPUT 4
OUTPUT 3
OUTPUT 2
OUTPUT 1
N/O N/C COM
N/O N/C COM
N/O N/C COM
N/O N/C COM
REDBACK S 0080
DIN RAIL TIMER
BUTTON AT PAINT DESK
Assistance
Required

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Redback® A 4435 Mixer 4 Input & Message Player
2.4 DIP Switch settings
The A 4435 have a set of options which are enabled via the DIP switches 1-5.
DIP 1-4 set the input level sensitivity, phantom power and priorities for inputs 1-4 as outlined below.
(* Priority/VOX muting is only available for inputs 1-2. Inputs 3-4 have no priority levels.)
DIP 1
Switch 5 - Input 1 Select - OFF - Mic, ON - Line
Switch 6 - Sets Input 1 sensitivity to either ON - 1V or OFF - 100mV. (This affects both the Balanced Mic and Line inputs)
Switch 7 - Sets Input 1 priority or VOX to ON or OFF.
Switch 8 - Enables Phantom power to the Mic on input 1.
DIP 2
Switch 1 - Input 2 Select - OFF - Mic, ON - Line
Switch 2 - Sets Input 2 sensitivity to either ON -1V or OFF -100mV. (This affects both the Balanced Mic and Line inputs)
Switch 3 - Sets Input 2 priority or VOX to ON or OFF.
Switch 4 - Enables Phantom power to the Mic on input 2.
DIP 3
Switch 5 - Input 3 Select - OFF - Mic, ON - Line
Switch 6 - Sets Input 3 sensitivity to either ON - 1V or OFF - 100mV. (This affects both the Balanced Mic and Line inputs)
Switch 7 - Not used
Switch 8 - Enables Phantom power to the Mic on input 3.
DIP 4
Switch 1 - Input 4 Select - OFF - Mic, ON - Line/Music input (Must be set to ON for Music Input to operate)
Switch 2 - Sets Input 4 sensitivity to either ON - 1V or OFF - 100mV. (This affects both the Balanced Mic and Line inputs)
Switch 3 - Not used
Switch 4 - Enables Phantom power to the Mic on input 4.
Input 1: When VOX is enabled on input 1 it will override inputs 2 - 4.
Input 2: When VOX is enabled on input 2 it will override inputs 3 - 4.
DIP 5
Switch 1 - ON - Hold trigger contact closed to play, OFF - Hold trigger contact closed momentarily to play.
Switch 2 - ON - Trigger 4 acts as a remote cancel, OFF - trigger 4 acts as normal trigger.
Switch 3 - Not used
Switch 4 - Not used
3.0 TROUBLE SHOOTING
If the REDBACK Phase 4 amplier fails to deliver the rated performance, check the following:
No Power, No Lights
The standby switch is used to turn the unit on. Make sure this switch has been pressed.
Make sure mains power switch is on at the wall.
Check the supplied plugpack is connected correctly.
MP3 les not playing
The les must be MP3 format. Not wav, AAC or other.
Check SD card is inserted correctly.
DIP switch changes not effective
Turn the unit OFF before changing DIP switch settings. Settings become effective after power is returned.
IMPORTANT NOTE:
Ensure power is switched off when adjusting DIP switches.
New settings will be effective when power is switched back on.

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Redback® A 4435 Mixer 4 Input & Message Player
5.0 SPECIFICATIONS
OUTPUT LEVEL:..........................................0dBm
DISTORTION:............................................0.01%
FREQ. RESPONSE:........................140Hz - 20kHz
SENSITIVITY
Mic inputs: .....................................3mV balanced
Line inputs:...........................................100mV-1V
OUTPUT CONNECTORS
Line out: ................3 pin XLR balanced or 2 x RCA
Switched out: ...............................Screw terminals
INPUT CONNECTORS
Inputs: ..................3 pin XLR balanced or 2 x RCA
............ 3.5mm stereo jack front panel
24V DC power: ............................Screw terminals
24V DC Power: ............................2.1mm DC Jack
Remote triggers: ..........................Screw Terminals
* Specications subject to change without notice
CONTROLS:
Power:..........................................Standby Switch
Bass:...........................................±10dB @ 100Hz
Treble:.........................................±10dB @ 10kHz
Master: ....................................................Volume
Inputs 1-4: ...............................................Volume
MP3: ........................................................Volume
INDICATORS:....................Power on, MP3 error,
...................Message active
POWER SUPPLY:..................................... 24V DC
DIMENSIONS:≈................... 482W x 175D x 44H
WEIGHT: ≈............................................... 2.1 kg
COLOUR: ..................................................Black
4.0 FIRMWARE UPDATE
It is possible to update the rmware for this unit by downloading updated versions from www.altronics.com.au or
redbackaudio.com.au.
To perform an update, follow these steps.
1) Download the Zip le from the website.
2) Remove the SD card from the A 4435 and insert it into your PC. (Follow the steps on page 8 to open the SD card).
3) Extract the contents of the Zip le to the root folder of the SD Card.
4) Rename the extracted .BIN le to update.BIN.
5) Remove the SD card from the PC following windows safe card removal procedures.
6) With the power turned OFF, insert the SD card back into the A 4435.
7) Turn the A 4435 ON. The unit will check the SD card and if an update is required the A 4435 will perform the update
automatically.

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Redback® A 4435 Mixer 4 Input & Message Player
All Australian made Redback products are covered by a 10 year warranty.
Should a product become faulty please contact us to obtain a return authorisation number. Please ensure you have all the
relevant documentation on hand. We do not accept unauthorised returns. Proof of purchase is required so please retain
your invoice.
Warranty
SPRINGV
ALE RD
PRINCES H’WAY
HARCOURT AV
ALBERT CR
KALMINA AV
WESTALL RD
GARDEN R
CENTRE RD
ROE ST
FITZGERALD ST
JAMES ST
Northbridge
Perth GPO
1km
PARRAMATTA RD
DUCK ST
SHORT ST
MEGA MALL
Sydney GPO
Auburn
20km
MITCHELL FWY
Balcatta
ERINDALE RD
BOYA WAY
LEDGAR RD
DELAWNEY ST
Sydney, NSW.
15 Short St, AUBURN,
NSW 2144
Open:
Mon-Fri 8.30am - 5.30pm
Sat 9.00am - 4.00pm
Melbourne, Vic.
891 Princes Hwy, SPRINGVALE,
VIC 3171
Open:
Mon-Fri 8.30am - 5.30pm
Sat 9.00am - 5.00pm
Sun 10.00am - 4.00pm
Perth, WA.
174 Roe St, PERTH, WA 6000
Open:
Mon-Wed,Fri 8.00am - 5.30pm
Thur 8.00am - 8.00pm
Sat 8.30am - 5.00pm
Sun 12.00pm - 5.00pm
Virginia
SANDGATE ROAD
MCDONALDS
ROBINSON RD EA.
PRITCHARD ROAD
VAUXHALL ST
Brisbane
GPO 17km
Brisbane, Qld.
Unit 2, 1870 Sandgate Rd,
VIRGINIA, QLD 4014
Open:
Mon-Wed,Fri 8.00am - 5.30pm
Thur 8.00am - 8.00pm
Sat 8.30am - 5.00pm
Sun 10.00am - 4.00pm
Balcatta, WA.
Unit 7, 58 Erindale Rd,
BALCATTA, WA 6021
Open:
Mon-Fri 8.00am - 5.30pm
Sat 8.30am - 5.00pm
Sun 10.00am - 4.00pm
Cannington
CECIL AVE
ALBANY HWY
WHARF ST
WHARF ST
MASON ST
FLETCHER ST
LEILA ST
BUNNINGS
CAROUSEL
Cannington, WA.
Unit 6, 1326 Albany Highway,
CANNINGTON, WA 6107
Open:
Mon-Wed,Fri 8.00am - 5.30pm
Thur 8.00am - 8.00pm
Sat 8.30am - 5.00pm
Ph: 1300 797 007 Fax:[phone]
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Retail / Trade / Education & Government customers