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Phase4 Public Address Amplifier 125W

SKU : A4070B

RRP: $699.00
Our Price: $614.10
Less: $84.90


  • Description
  • Reviews
Manufactured in Australia to stringent engineering criteria, the Phase 4 amplifier series exhibit remarkable performance and outstanding reliability. Over 2 years in design and development, the evolution of Phase 4 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 4 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", "low" or "high" 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?tart is automatic once normal temperatures are attained. The output voltage is limited to 110V 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. In the event of an overload, the output current is limited by the internal circuitry, thus reducing the output voltage at the speaker terminals. The front panel ?verload?LED flashes, indicating a fault with the speaker circuit.


  • Multi-stage thermally cued fan cooling
  • LED bargraph VU meter
  • Input signal presence indicator
  • Output peak limited
  • 2U 19" rack mount
  • 3 pin XLR input, 3 pin XLR loop out
  • Level control rear mounted
  • 100V, 70V and 4 - 16Ω outputs
  • Thermal and overload protection
  • 240V AC, or 24V DC operation
  • 300mA 24V battery trickle charge

100% developed, designed & assembled in Australia.
Single 1976 Redback PA products have been manufactured in Perth, Western Australia by Altronics. With over 35 years experience in the commercial audio industry, we offer consul tants, installers and end users reliable products of high build quality with local product support. Read more about our Australian Made products

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. Read more about our industry leading warranty.

  • Model: A4070B
  • Brand: Redback

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