A 4380A • Phase5 Public Address Power Amplifier 250W

This booster is ideal for installations requiring a high power zone amplifier. Ideal for use in shopping centres, pedestrian precincts, public transport facilities and convention centres. Rated at 250W RMS for powering strings of 100V line speakers.

SKU: A 4380A Categories: , ,

This range of booster amplifiers are ideal for installations requiring high power zone amplifiers. Simply choose a power rating according to the wattage required for each zone. These high power models are ideal for use in shopping centres, pedestrian precincts, public transport facilities and convention centres. All models operate on 240V ac and 24V dc for battery backup operation. Input is via 3 pin balanced XLR (500mV). Level control is rear mounted to prevent tampering or accidental adjustment.

The circuit design includes protection features in case of output over voltage, over current and over temperature conditions. All are self resetting once the fault condition has been removed. Visual indication via front panel LEDs show amplifier status at all times. On demand fan cooling ensures reliable operation at all times. A dedicated nominal 24V dc 1A output is provided on the rear to power ancillary devices.

Key Features:

  • Multi-stage thermally cued fan cooling
  • Input signal presence indicator
  • Output peak limited
  • 2U 19″ rack mount (ears included)
  • 3 pin XLR input
  • Level control rear mounted
  • 100V, 70V and 4 – 16Ω outputs
  • Thermal and overload protection
  • 240V ac, or 24V dc operation
  • 24V dc 1A output
  • 1A 24V Ancillary device power output


Developed, designed & assembled in Australia.
Since 1976 Redback PA products have been manufactured in Perth, Western Australia by Altronics. With over 40 years experience in the commercial audio industry, we offer consultants, installers and end users reliable products of high build quality with local product support.

Backed by an industry leading 10 Year Manufacturer Warranty.
Our Redback products have a long tried and tested history of bulletproof reliability. Altronics offers a 10 Year Warranty on all Australian Made Redback products. Our local in-house service department has all the know how to answer technical queries and provide timely service.

Power output: 250W watts RMS
Distortion: < 0.5% @ 1kHz Output line: 100V, 70V or 4-16Ω Signal to noise ratio >90dB
Frequency response: 50Hz – 15kHz, -3dB
Input sensitivity: 500mV
Power supply: 240V AC or 24V DC
Current draw: 250mA Standby, 17A Full load
240V AC power: IEC power connector
24V DC power Screw terminal
Protection: 7.5A AC, 20A DC fuse per channel
LED indicators: Over temperature, Over current,
Shutdown,Overload, Signal,
Peak, Power, 240V AC, 24V DC

Volume 1: Controls line 1
Power: On/Off switch

Dimensions: 423W x 340D x 88H mm
Weight: ≈19kg

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