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Redback® A 4270/80 Four Zone Paging PA Amplifier
A 4488
Four Zone Paging Console
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
Optional Extras
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
Redback® Proudly Made In Australia
Distributed by Altronic Distributors Pty. Ltd.
User manual revision number: 1.2 23/09/2021
Redback® Proudly Made In Australia
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 Extras A 4488 A 4373 A 2280B A 4376 Four Zone Paging Console...
- 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...
- Page 5 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...
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Page 6: Wiring Configuration
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 Redback® A 4270/80 Four Zone Paging PA Amplifier 9.0 REMOTE VOLUME (Optional) It is possible to control the master volume with the addition of the A 4373 Digital Remote volume board and a 1kΩ potentiometer (or Altronics A 2280B wall plate) fitted across the terminals labelled “Optional Plugin” on the rear of the amplifier.
- Page 8 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.
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Page 9: Dip Switches
2.1mm DC jack (centre pin positive). A 24V DC plugpack may be required if the A 4488 is run more than 100m from the amplifier. RJ45 connector For connection back to the A 4270 or A 4280. Either port can be used. DIP switch options These switches set the pre-announcement chime and set the ID number. - Page 10 Redback® A 4270/80 Four Zone Paging PA Amplifier 13.0 A 4488 GENERAL PAGING To page to a zone select the desired zone/s by pressing the buttons 1- 4 or by pressing the “All Call” button if all zones are desired. Make sure the switch is in the centre position before selecting the zones. The selected zones’ LED’s will illumi- nate to indicate they have been pressed.
- Page 11 Redback® A 4270/80 Four Zone Paging PA Amplifier 15.0 ALERT, EVACUATION and CHIME MP3 FILES and ALERT and EVAC VOICE OVER MESSAGES The supplied MIcro SD card houses all the MP3 audio files used for the output tones. These files are stored in five separate folders (see figure 5) and relate to the corresponding output.
- Page 12 Redback® A 4270/80 Four Zone Paging PA Amplifier Fig 12 Open the Removable Disk and you should get a window that looks like figure 13. Fig 13 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.
- Page 13 Redback® A 4270/80 Four Zone Paging PA Amplifier Fig 14 This MP3 file needs to be deleted and replaced by the MP3 file you want to play when you activate the Alert mode. The MP3 file name is not important. But it is important that there is only one MP3 file in the Alert folder.
- Page 14 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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Page 15: Specifications
Speakers: ...........Screw terminals * Specifications subject to change without notice 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. -
Page 16: Related Products
Redback® A4390A 500W Power Amplifier The Redback A 4390A is a 500 Watt power amplifier for installations requiring a high power zone amplifier. Ideally suited for use in shopping centres, pedestrian precincts, public transport facilities and convention centres. The amplifier operates on 230V AC or 24V DC primarily for battery backup operation.
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