www.redbackaudio.com.au
Redback® Proudly Made In Australia
8
Redback® A 4377/87
Four Input Public Address Amplifier
POWER SUPPLY
The amplifier operates on 230V AC or primarily for battery backup operation a 24V DC supply. Ensure power is switched
OFF at the front panel before connecting either mains power to the IEC socket or 24V DC to the screw terminal input. As
high currents may be drawn when operating from a 24V DC supply confirm the capacity of the DC power supply used.
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.
Replace with only the correct type and rating. Over rated fuses with invalidate warranty.
Distorted Output
Check that the speaker type is correct for the output that you are using (ie. 100V line). Check for any short circuits on the
speaker line.
Very Low Output Volume
Make sure that the input is the correct level (check for shorted connectors). Check for any short circuits on the speaker
line.
Check if signal LED on the front panel is lit to indicate there is signal. If it is not lit there is no signal present.
Continually Blows Fuses
Make sure that the speaker line is not shorted. Check speaker types, ratings and if on correct output.
Amplifier Keeps on Cutting In & Out
Make sure that there is adequate ventilation around the amplifier. Check the vent slots on the front,top and sides are not
covered or blocked and the fan on the rear is functioning correctly. Check also speaker types, ratings and for any short
circuits on the speaker line.
* 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. We do not accept unauthorised returns. Proof of purchase is required so please retain
your invoice.
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
