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Instructions Brochure


Designed to meet the requirements of medium sized professional public address installations. The A 4036A delivers an output power of 40W. Frequency response extends from 60Hz to 15kHz at a total harmonic distortion (THD) of less than 0.5%. Features include, VOX muting, four balanced XLR microphone inputs, four line RCA inputs, bass and treble controls, enabling a diversity of installation applications, including schools, public halls, workshops and sporting complexes. Inbuilt VOX muting allows input 1 (mic or line) to mute inputs 2-4 and input 2 (mic or line) to mute inputs 3-4.
Powered from 240V ac mains or 24V dc permitting battery backup operation during mains power failure. Output is 100V line or low impedance (4 - 16Ω) speaker loads. All units feature thermal overload shutdown to protect the amplifier if a speaker fault condition develops. Master volume can be controlled remotely via figure 8 cable and the A 2280B wall control unit or 1K potentiometer (part no. R 2202).

A 4573 Alert/evac option board:
Generates pre chime, bell, alert and evacuation tones. The alert tone can function continuously, or switch to evac tone after a preset time delay (adjustable 30 seconds to 4.5 minutes). Simply connects to the amplifier internally via the cable provided.

A 2280B Remote volume wall plate:
Connects via figure 8 cable to the “remote volume” terminals of the amplifier. Enabling overall volume to be adjusted as required. Features a PCB jumper to reverse the volume control direction. Maximum cable length 100m.


  • 4 balanced microphone inputs
  • Phantom power on mic inputs
  • 4 line inputs
  • 19" rack mount kit included
  • VOX muting
  • Tape output RCA sockets
  • Bass and treble tone controls
  • Terminals for 100V line & 4 - 16Ω
  • 240V ac or 24V dc operation
  • Built in short circuit protection
  • Optional evac module available
  • Optional remote volume plate

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.

Information & Downloads


  • Power Output: 40 watts RMS
  • Distortion: < 0.5% @ 1kHz
  • Signal to Noise Ratio: Typically 75dB below rated output. All inputs.
  • Frequency Response
  • Mic inputs: 50Hz - 10kHz, -3dB
  • Line inputs: 60Hz - 15kHz, -3dB
  • Output line: 70V*, 100V or 4 - 16Ω
  • Input Sensitivity
  • Mic inputs: 1.5mV balanced
  • Line inputs: 400mV
  • Output Connectors
  • Speakers:Screw terminals
  • Input Connectors
  • Mic 1-4: 3 pin XLR balanced
  • Line inputs 1-4: RCA stereo socket
  • 24V DC power: Screw terminals
  • 240V AC power: IEC power connector
  • Muting: VOX on inputs 1 & 2, 60dB below rated output
  • Remote volume: Screw terminals
  • Controls
  • Mic inputs: Volume
  • Line inputs: Volume
  • Bass: ±10dB @ 100Hz
  • Treble: ±13dB @ 10kHz
  • Power: On/off switch
  • Indicators: Power, Overload
  • Power supply: 240V AC or 24V DC
  • Protection: 1A AC fuse and 4A DC fuse
  • Weight: ≈7.1 kg
  • Dimensions: ≈423W x 225D x 88H mm
  • Colour: Black
    • *Specifications are subject to change without notice.

Warranty & Returns


We offer 10 years warranty on this product from its date of purchase. This is available from Altronics stores, online purchases or Altronics resellers. In accordance with our full warranty terms we will repair, replace or refund if goods you have purchased from us are defective.


Not withstanding our warranty policy, if you are dissatisfied with our goods or service you may return the goods within 14 days of our despatch date. Simply contact us for a return authorisation number and we will refund your purchase in full, less transport costs on receipt of goods. All returned goods must be in as sold condition including all packaging, instructions, invoices etc.