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www.redbackaudio.com.au

Redback® Proudly Made In Australia

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Redback® A 4270/80

 Four Zone Paging PA Amplifier

REDBACK

 is a registered trademark of Altronic Distributors Pty Ltd

You may be surprised to learn that Altronics is still manufacturing hundreds of product lines right here in Australia. We 
have resisted the move offshore by offering our customers better quality products with innovations to save them time and 
money.

Our Balcatta production facility manufactures/assembles:

Redback public address products
One-shot speaker & grill combinations
Zip-Rack 19 inch rack frame products

We strive to support local suppliers wherever possible in our supply chain, helping to support Australia’s manufacturing 
industry.

Redback Audio Products

100% developed, designed & assembled in Australia.

Since 1976 we have been manufacturing Redback amplifiers in Perth, Western Australia. With over 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 significant added value for customers when purchasing an Australian made 
Redback amplifier or PA product.

Local support & feedback.

Our best product features come as a direct result of feedback from our customers, and when you call us, you speak to a 
real person - no recorded messages, call centres or automated push button options. 
It’s not only the assembly team at Altronics who are employed as a direct result of your purchase, but hundreds more at 
local companies used in the supply chain.

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 bullet-
proof reliability. We’ve heard PA contractors tell us they still see the original Redford amplifier still in service in schools.

We offer this comprehensive parts & labour warranty on almost every Australian Made Redback public address product. 
This offers both installers and end users peace of mind that they will receive prompt local servicing in the rare event of any 
problems.

Published by Altronic Distributors 
© 2021 Altronic Distributors

Summary of Contents for A 4270

Page 1: ...se 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 design...

Page 2: ...users reliable products of high build quality with local product support We believe there is significant added value for customers when purchasing an Australian made Redback amplifier or PA product Lo...

Page 3: ...Thermal overload overcurrent and overload protection circuitry and fuses on both AC and DC provide excellent fault condition protection and robust performance The amplifier also utilises a half power...

Page 4: ...tes when the input signal is clipping 11 OverLoad Indicator This LED indicates when the output is drawing too much current from the amplifier The output will be disconnected until the current draw is...

Page 5: ...ore details 7 Inputs 1 3 These inputs can be either a balanced XLR input with sensitivities of 500mV or dual RCA line inputs with a 1V input sensitivity The line input dual RCA connectors are internal...

Page 6: ...one inputs have DIP switch selectable phantom power When enabled 15V DC will be connected to the Hot and Cold pins of the corresponding XLR To access the DIP switches first disconnect power from the u...

Page 7: ...of connecting speakers in parallel and cable losses The amplifier generally has an output voltage of 100 volts 70 volts is typically used in North America however operation is similar In this configu...

Page 8: ...ging 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 R...

Page 9: ...from the amplifier 2 RJ45 connector For connection back to the A 4270 or A 4280 Either port can be used 3 DIP switch options These switches set the pre announcement chime and set the ID number 4 BGM B...

Page 10: ...o the 3 5mm input jack on the rear of the paging microphone as shown in Figure 10 This provides a local source of background music To activate the background music first make sure the Push to Talk PTT...

Page 11: ...hown in figure 11 The messages have to be recordered in MP3 format using any readily available PC software or other means and then transferred to these folders Activating the Voice Over Message Voice...

Page 12: ...ts of the SD Card include a Library folder of sample MP3 files and five folders for the MP3 files associated with the various triggers There should be default MP3 files included in each folder These w...

Page 13: ...e MP3 file NOTE the new MP3 file cannot be Read only To check this right click on the MP3 file and scroll down and select Properties you will get a window that looks like figure 15 Make sure the Read...

Page 14: ...lifier and insert it into your PC Follow the steps on page 11 to open the SD card 3 Extract the contents of the Zip file to the root folder of the SD Card 4 Rename the extracted BIN file to update BIN...

Page 15: ...Pin XLR OUTPUT CONNECTORS Speakers Screw terminals INPUT CONNECTORS Inputs 3 pin XLR balanced or 2 x RCA 24V DC power Screw terminals 240V AC power IEC power connector MUTING PTT via microphone switc...

Page 16: ...r Amplifier The Redback A 4395A is a 500 Watt Mixer amplifier for installations requiring a high power zone amplifier The amplifier has two audio inputs with input 1 either a balanced XLR input or dua...

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