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 Four Zone Paging Console A 4373 Remote Volume Module A 2280B Remote Volume Wall Plate A 4376 Rack Mount Ears Redback® Proudly Made In Australia IMPORTANT NOTE: Please read these instructions carefully from front to back prior to installation. They include important setup instructions.
Redback® A 4270/80 Four Zone Paging PA Amplifier You may be surprised to learn that Redback 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.
Redback® A 4270/80 Four Zone Paging PA Amplifier 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. The addition of zone paging is made possible by connecting Redback® A 4488 paging consoles to the amplifier.
Redback® A 4270/80 Four Zone Paging PA Amplifier 3.0 FRONT PANEL CONTROLS Figure 1 shows the layout of the front panel. 1 Volume 1 2 Volume 2 Volume 3 3 4 5 BGM Output Select Status Indicators 125W Public Address Amplifier Master Volume Model : A 4270 Out 1 4 6 2 4 8 6 2 4 8 4 6 2 6 2 8 10 VOX 1 Sens. 0 16 10 VOX 2 Sens.
Redback® A 4270/80 Four Zone Paging PA Amplifier 4.0 REAR PANEL CONNECTIONS Figure 2 shows the layout of the rear panel. To Paging Console 1 Triggers Output Levels To Paging Console 2 EV 7.5 Amp OUT1 (100V) Evac Chime V/Over Volume Volume Volume Micro SD Card DIP (16GB Switches Maximum) 1 + _ + 240V AC @ 50Hz 12 125W 10 Amp 250W 20 Amp 24V+ DC IN _ + _ Optional Plugin www.redbackaudio.com.
Redback® A 4270/80 Four Zone Paging PA Amplifier 5.0 AUDIO CONNECTIONS MIc XLR The amplifier has three balanced XLR audio inputs, three dual RCA line inputs which are internally mixed to create mono signals and a front mounted Music Input for portable devices. This input when wiring connected, over-rides the rear channel 3 audio sources and is adjusted via the volume 3 level control.
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 1k� potentiometer (or A 2280B wall plate) �tted across the terminals labelled “Optional Plugin” on the rear of the ampli�er. The plugin board is �tted inside the ampli�er in the location shown in �g ure 4. NOTE: Take special care with the orientation of the board and remove power from the amplifier before fitting.
Redback® A 4270/80 Four Zone Paging PA Amplifier 10.0 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. When fitting speakers with line transformers the impedance of the load cannot be measured using a standard multimeter.
Redback® A 4270/80 Four Zone Paging PA Amplifier 11.0 A 4488 CONNECTIONS Figure 8 shows the layout of the rear panel. 24VDC In DIP Switches 1-2 Settings On SW Off PA System Chime Off 1 PA System Chime On Internal Chime Off 2 Internal Chime On BGM Input BGM Chime Mic Volume Volume Volume ON 1 2 3 4 1 2 3 4 1 2 3 4 5 6 7 Fig 8 1 2 3 4 5 6 7 24V DC connector 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.
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 illuminate to indicate they have been pressed. Move the “Push to talk” switch down to the “Page” position and speak into the microphone. Release the PTT switch when finished.
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. e.g. the Alert folder houses the MP3 file to be played when the Alert mode is triggered.
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. There should be default MP3 files included in each folder. These will need to be replaced with your own MP3 files.
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. 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 15.
Redback® A 4270/80 Four Zone Paging PA Amplifier 17.0 DIP SWITCH SETTINGS These switches affect the alert/evac triggers on the rear of the amplifier. Switch 1: The Alert and Evac contacts can be set to either continuous or momentary operation. In continuous mode the alert/evac tone will continue while the corresponding rear contact is triggered. In momentary mode the alert/evac tone will continue to sound after a momentary trigger of the rear contact.
Redback® A 4270/80 Four Zone Paging PA Amplifier Unit will not play MP3 files. Make sure all MP3 files are not “Read Only”. See page 13 MP3 files should have the following specifications for optimum performance. 128kbps, 44.1kHz, 32bit, VBR or CBR, Stereo (even better as mono). . 20.0 SPECIFICATIONS POWER OUTPUTS Power: .......................................... A 4377 -125 watts RMS .........................................A 4387 - 250 watts RMS Distortion:.................................................
Redback® A 4270/80 Four Zone Paging PA Amplifier RELATED PRODUCTS Redback® A 4370A 125W Power Amplifier, A 4380A 250W Power Amplifier These Redback 125W and 250W power amplifiers are ideal for installations requiring high power zone amplifiers. Ideally suited for use in shopping centres, pedestrian precincts, public transport facilities and convention centres. These amplifiersoperate on 230V AC or 24V DC primarily for battery backup operation.
