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A4255 • Compact 1RU Public Address (PA) Mixer Amplifier 100W


Cat. Page 49


  • $650.00
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Last updated 19-09-18 10:20:11

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These compact 1RU rack mount amplifiers are suitable for both stand alone PA system use, or as zone amplifiers in larger systems requiring local inputs. All models operate on 240V ac or 24V dc for battery backup operation.

All models include a choice of six source options on 2 inputs. Input one 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 is also provided on input one with adjustable sensitivity of either 100mV or 1V. Input two consists of three sets of dual RCA sockets on the rear panel and a 3.5mm jack on the front panel. Auxiliary source inputs are selected via the front panel switch. Input one can be DIP switch selectable to VOX mute input two. Phantom power is also provided on input one XLR. Volume level controls are provided on the front panel for inputs one and two.

The circuit includes protection features in case of output over voltage, over current and over temperature. All are self resetting once the fault condition is removed. Visual indication via front panel LEDs display amplifier status at all times­.


  • Compact 1RU 19” rack mount design
  • Balanced mic or line input
  • VOX muting
  • Phantom power
  • Four auxiliary inputs
  • Overload limiting
  • Over voltage limiting
  • On demand fan cooling
  • Over temperature shut down protection
  • Dual input connectors
  • Variable input sensitivities
  • 240V ac / 24V dc operation

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. 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.


  • Distortion: < 0.5%, @ 1kHz
  • Frequency response: 50Hz - 15kHz, -3dB
  • Output line: 100V
  • Mic sensitivity: XLR balanced 2mV to 2V
  • Line sensitivity: RCA 100mV/1V, 3.5 TRS 600mV
  • Signal to noise ratio: > 80 dB
  • Input 1: 3 pin XLR balanced / dual RCA
  • Input 2: Dual RCA x 3 / 3.5mm TRS jack x 1
  • 24V dc power: Pluggable screw terminals
  • 240V ac power: IEC power connector
  • Speaker output: Pluggable screw terminals
  • Current Draw: 160mA Standby, 8.5A Full @ 24V dc
  • Protection: 4A ac & 10A dc breaker
  • Dimensions: ≈ 483W x 210D x 44H
  • Weight: ≈ 6kg

*Specifications are subject to change without notice.

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