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Table of Contents
OVERVIEW
These compact 1RU rack mount ampliers are suitable for both stand alone PA system use, or as zone ampliers in
larger systems requiring local inputs. All models operate on 240V ac or 24V dc for battery backup operation.
The input consists of a 3-pin XLR which can be set for either balanced mic level (3mV) or balanced line level (2V), adjusted
via a rear mounted trimpot. A dual RCA input is also provided with adjustable sensitivity of either 300mV or 1V.
Phantom power is also provided on the input XLR.
The circuit includes protection features in case of output over voltage, over current and over temperature. All are self
re-setting once the fault condition is removed. Visual indication via front panel LEDs display amplifier status at all times.
FEATURES
• Compact 1RU 19" rack mount design
• Balanced mic or line input
• Phantom power
• Overload limiting
• Over voltage limiting
• On demand fan cooling (60W and 100W versions only)
• Over temperature shut down protection
• Dual input connectors
• Variable input sensitivities
• 240V ac / 24V dc operation
• Australian designed & manufactured
www.altronics.com.au
Operating Manual
A 4230
30W Public Address Amplifier
A 4240
60W Public Address Amplifier
A 4250
100W Public Address Amplifier
Redback® Proudly Made In Australia
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Summary of Contents for Redback A 4230
- Page 1 • On demand fan cooling (60W and 100W versions only) • Over temperature shut down protection • Dual input connectors • Variable input sensitivities • 240V ac / 24V dc operation • Australian designed & manufactured Redback® Proudly Made In Australia...
- Page 2 Speakers fitted with a 100V line transformer may be connected. Always ensure that the toal load of the speakers does not exceed the rated output of the amplifier ie 333Ω minimum at 100V for the A 4230 (30W), 166Ω minimum at 100V for the A 4240 (60W) and 100Ω minimum at 100V for the A 4250 (100W). Otherwise either the DC or mains fuse could blow or the fault led activate and the amp will shut down.
- Page 3 TROUBLE SHOOTING If the REDBACK 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.
- Page 4 SPECIFICATIONS SIGNAL TO NOISE RATIO POWER OUTPUTS Mic input: ..> 75dB below rated output A 4230: .........30 watts RMS Line input:..> 81dB below rated output A 4240: .........60 watts RMS A 4250: .......100 watts RMS OUTPUT CONNECTORS Distortion:......< 0.5%, @ 1kHz Speakers: ......Screw terminals...
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