www.altronics.com.au
Operating Manual
A 4390
500 Watt Power Amplifier
Redback® Proudly Made In Australia
OVERVIEW
The Redback A 4390 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.
FEATURES
• Robust design incorporating latest Mosfet technology
• Very Low noise and distortion
• 70V, 100V and 4-16Ω outputs
• 240V AC or 24V DC operation
• 24V DC @ 1 Amp output for external devices
• 300mA battery trickle charge
• Multi stage thermally cued fan cooling
• Output Peak Limited
• Thermal Overload protected
• Signal Presence Indicators
• Fault Indicators
• Power Status Indicators
• Rack Mountable (suits 19 inch racks)
POWER SUPPLY
The amplifier operates on 230V AC or 24V DC primarily for battery backup operation. 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. (see Fig 2
for more details) As high currents may be drawn when operating from a 24V DC supply confirm the capacity of the DC
power supply used.
AUDIO CONNECTIONS
Audio input is via a 3 pin XLR socket on the rear of the amplifier. This is a 500mV line level balanced signal which is
normally fed from from a mixer panel. Pinout details are printed on the rear of the amplifier. A balanced Line Out XLR
socket is also provided on the rear of the amplifer for passing the audio signal on to more slave amplifiers if required. The
amplifier output level control is also rear mounted to prevent tampering or accidental adjustment (see Fig 2 for more
details).
User manual revision number: 1.1 25/03/2015
