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Redback® 500Watt Power Amplifier
Operating Manual
A 4390A
500 Watt Power Amplifier
OVERVIEW
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.
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).
Redback® Proudly Made In Australia
User manual revision number: 1.1 19/10/2021
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Summary of Contents for Redback Phase 5 A 4390A
- Page 1 A 4390A 500 Watt Power Amplifier OVERVIEW 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. FEATURES •...
- Page 2 When fitting speakers with line transformers the impedance of the load cannot be measured using a standard multimeter. An impedance meter is required such as the Redback® Q 2004 Impedance Meter. Fig 1 lists the impedance at certain loads of speakers fitted with 70V and 100V line transformers. So for a total load of 500 watts using 100V line transformer fitted speakers the impedance of the speaker load should be 20Ω.
- Page 3 LINE OUT LINE IN LINK TO INPUT CHARGE 24V DC (1A Max) BACKUP Made in Australia by RESETTABLE RESETTABLE BATTERY Altronic Distributors Pty Ltd FUSE 20 AMP FUSE 20 AMP www.altronics.com.au 4 -16Ω Fig 2 www.redbackaudio.com.au Redback® Proudly Made In Australia...
- Page 4 - no recorded messages, call centres or automated push button options. It’s not only the assembly team at Redback who are employed as a direct result of your purchase, but hundreds more at local companies used in the supply chain.
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