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Redback® A 4270/80 Four Zone Paging PA Amplifier
A 4660A
Paging Console
A 4658
Power Injector
Please read these instructions carefully from front to back prior to installation.
Failure to follow these instructions may prevent the unit from working as designed.
www.redbackaudio.com.au
A 4270
125 WATT FOUR ZONE PAGING PA AMPLIFIER
A 4280
250 WATT FOUR ZONE PAGING PA AMPLIFIER
A 4373
Remote Volume Module
Phone: 1300 780 999 Fax: 1300 790 999 Internet: www.altronics.com.au
IMPORTANT NOTE:
They include important setup instructions.
Operating Manual
A 2280B Remote Volume Wall Plate
A 2280B
Remote Volume Wall Plate
Redback® Proudly Made In Australia
Distributed by Altronic Distributors Pty. Ltd.
User manual revision number: 2.0 05/05/2025
Redback® Proudly Made In Australia
Optional Accessories
A 4660A Paging Console
A 4658 Power Injector Box
A 4373 Remote Volume Module
A 4376 Rack Mount Ears
A 4376
Rack Mount Ears
1
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Summary of Contents for Redback A 4270
- Page 1 Redback® A 4270/80 Four Zone Paging PA Amplifier Operating Manual A 4270 125 WATT FOUR ZONE PAGING PA AMPLIFIER A 4280 250 WATT FOUR ZONE PAGING PA AMPLIFIER Optional Accessories A 4660A Paging Console A 4658 Power Injector Box A 4373 Remote Volume Module...
- Page 2 100% 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.
- Page 3 1.0 OVERVIEW The Redback® A 4270 125 Watt and A 4280 250 Watt 4 Zone paging amplifiers are specifically designed for multi zone applications. Based on the popular Redback® A 4377 and A 4387 amplifier series, these amplifiers have three inputs which can be configured for either microphone or line level.
- Page 4 Redback® A 4270/80 Four Zone Paging PA Amplifier 3.0 FRONT PANEL CONTROLS Figure 1 shows the layout of the front panel. Status Indicators BGM Output Select 125W Public Address Ampli er Volume 1 Volume 2 Volume 3 Master Volume Power...
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Page 5: Rear Panel Connections
240V AC power socket (Australian standard) Connects to 240V AC mains power with the included IEC lead. The internal fuse is an M205 5Amp for the A 4270 125 Watt amplifier and an M205 7.5Amp for the A 4280 250 Watt amplifier. www.redbackaudio.com.au... -
Page 6: Audio Connections
1 • Earth/Shield Fig 3 shows a typical install where the A 4270 has a balanced microphone connected to input 1 and 2 • Signal Hot a Line level source connected to input 2. If the VOX1 switch is set to “ON”, the microphone will VOX 3 •... -
Page 7: Speaker Connections
Speakers fitted with 100V line transformers may be connected to the output terminals on the rear of the amplifer. Always ensure the total load of the fitted speakers does not exceed the rated output of the amplifier (ie 125 watts for the A 4270 and 250 watts for the A 4280 amplifier) otherwise damage may result. - Page 8 Redback® A 4270/80 Four Zone Paging PA Amplifier Figure 6 illustrates a typical install where the A 4270 has all five outputs connected to 100V line speakers, and a Redback® A 4660A Paging console is connected to the one of the RJ45 ports.
- Page 9 Fig 8 There are two RJ45 ports on the back of the A 4270 either of which can be used to connect an A 4660A paging console. The maximum distance between the A 4270 and a paging console is 200m.
- Page 10 Con guration Fig 9 Note: Power Over Ethernet or POE’s cannot be used as the power injectors as they run on 48V. The A 4270 and A 4660A systems are powered by 24V DC. Use of POE’s will void the warranty.
- Page 11 Redback® A 4270/80 Four Zone Paging PA Amplifier 12.0 A 4660A HOME SCREEN Figure 11 below outlines the main functions of the A 4660A. Installer Label BGM will play from SD card Zone 1 Zone 2 Zone 3 Zone 4...
- Page 12 Redback® A 4270/80 Four Zone Paging PA Amplifier 13.0 A 4660A SETTINGS The settings menu can be accessed using the icon on the top left of the screen. Once in this menu the following screen will be displayed, which shows the various settings available.
- Page 13 Redback® A 4270/80 Four Zone Paging PA Amplifier 13.2 A 4660A Backlight Settings Press the “backlight” button to display the screen shown in figure 14. There are two levels of screen brightness which come into effect, when the screen hasn’t been touched for a period of time set by the user.
- Page 14 Redback® A 4270/80 Four Zone Paging PA Amplifier 13.6 A 4660A Microphone settings Press the “microphone” button to display the screen shown in figure 15. From this menu the chime options and action of the paging button are set. Chime through local speaker ->...
- Page 15 Redback® A 4270/80 Four Zone Paging PA Amplifier 14.0 A 4660A LOCAL BACKGROUND MUSIC (BGM) Background music to the four output zones is primarily fed from the audio output of the amplifier and selected by the front panel switches. But a secondary source of background music is available through the A 4660A paging console. There are three options available as background music sources.
- Page 16 Redback® A 4270/80 Four Zone Paging PA Amplifier A 4660A Background Music (Line In) A local BGM source such as a mobile phone or tablet, can be connected to the A 4660A through a 3.5mm audio lead. Figure 17 illustrates the use of a mobile phone as the local BGM source. This is connected to the BGM In of the A 4660A paging console.
- Page 17 Redback® A 4270/80 Four Zone Paging PA Amplifier Fig 18 16.0 INSTALLING MP3 FILES You will first need to remove power from the amplifier then remove the Micro SD card from the rear of the amplifier. To remove the Micro SD card push the card in and it will eject itself.
- Page 18 Redback® A 4270/80 Four Zone Paging PA Amplifier Open the Removable Disk and you should get a window that looks like figure 20. Fig 20 The contents of the SD Card include a Library folder of sample MP3 files and five folders for the MP3 files associated with the various triggers.
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Page 19: Dip Switch Settings
Redback® A 4270/80 Four Zone Paging PA Amplifier Check the properties of the 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 22. - Page 20 Redback® A 4270/80 Four Zone Paging PA Amplifier 19.0 TROUBLESHOOTING If the REDBACK Phase 4 amplifier fails to deliver the rated performance, check the following: No Power, No Lights Make sure amplifier power switch is on. Make sure mains power switch is on at the wall. Check the mains and DC fuse.
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