Redback Phase5 Boost Public Address (PA) 2x125W Amplifier

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Available on orders $80 to $1000
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Available on orders $80 to $1000
Learn more

Manufactured in Australia to stringent engineering criteria, the Phase 5 amplifier series exhibit quite remarkable performance and outstanding reliability.

Availability: Available Usually Dispatched In: 2 - 5 Business Days Product Code: ALT-A4372 ISBN: 9321758196007 Brand/Publisher: Redback Categories: Professional Audio

Part of the series PA Amplifiers.

View all products in this series

Manufactured in Australia to stringent engineering criteria, the Phase 5 amplifier series exhibit quite remarkable performance and outstanding reliability. Over 2 years in design and development, the evolution of Phase 5 included extensive consultation and input from pro sound contractors and installers across the country. The host of features incorporated commend this amplifier series to the most demanding of pro sound and industrial PA system applications. Redback Phase 5 amplifiers incorporate on demand multi-staged thermally cued fan forced cooling.

The output power stage is thermally monitored enabling automatic operation of a long life computer style cooling fan to "off" or "on" air flow through a specially designed tunnel heatsink. In quiescent or ordinary cycle paging mode the fan is inoperative. Over temperature sensing is employed to shut down the amplifier in extreme over heat conditions, eg extreme over load and /or over drive misuse. Re–start is automatic once normal temperatures are attained. Output peak limiting.

The output voltage is limited to 105V maximum RMS voltage irrespective of load impedance to prevent damage to speaker load. Standard 100V line PA amplifiers can deliver up to 180 volts or more under conditions of high drive and very light loading. This output over voltage can quickly destroy any loudspeakers connected.


  • Robust design incorporating latest Mosfet technology
  • Very Low noise and distortion
  • 100V outputs
  • 240V AC or 24V DC operation
  • 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)

100% 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: 2 x 125 Watts RMS
  • Distortion: < 0.5%, @ 1kHz
  • Output Line: 100V
  • Frequency Response
  • Mic Inputs: 50Hz - 12kHz, -3db
  • Mic Sensitivity (3 pin XLR): 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
  • 24V DC power: Screw terminals
  • 240V AC power: IEC power connector
  • Controls
  • Mic inputs: Volume
  • Power: On/off switch
  • Indicators: Power, signal present, output peak limiting, overtemp ,current limit, Protect, Half Power, 24V DC, Mains
  • Power Supply: 240V AC or 24V DC
  • Fuse Protection: 7.5A AC , 2x 10A DC
  • Dimensions: ≈483W x 410D x 88H

*Specifications are subject to change without notice.


ISBN 9321758196007
Publisher Redback
Product Type PA Equipment,

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