User Manual
www.redbackaudio.com.au Redback® Proudly Made In Australia 15
Redback® A 4270/80 Four Zone Paging PA Amplier
Unit will not play MP3 les.
Make sure all MP3 les are not “Read Only”. See page 13
MP3 les should have the following specications 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:..................................................< 0.5%, @ 1kHz
Output line: ............................................................... 100V
FREQUENCY RESPONSE
Mic inputs :...........................................50Hz - 12kHz, -3dB
Line inputs: ...........................................50Hz - 15kHz, -3dB
MIC SENSITIVITY
Mic inputs: ................................................................. 3mV
Line inputs:.....................................................................1V
Music input: ............................................................500mV
SIGNAL TO NOISE RATIO
Mic inputs: .............................. > 75dB below rated output
LINE OUTPUT .................. 600Ω balanced, 0dB , 3 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 switch contacts
........................................ VOX muting (inputs 1-2)
CONTROLS
Mic/Line/Music inputs: ............................................ Volume
Power: ...........................................................On/off switch
Indicators:......................Power, signal present, output peak
limiting, overtemp ,Overload Protect, Half Power, 24V DC
POWER SUPPLY: ................................240V AC or 24V DC
FUSE PROTECTION: ......................125W - 5A AC ,10A DC
...................250W - 7.5A AC ,20A DC
DIMENSIONS ...................................≈483W x 300D x 88H
* Specications 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. We do not accept unauthorised returns. Proof of purchase is required so please retain
your invoice.