Front view of the Redback A4037 40W Public Address Amplifier, featuring volume controls, treble and bass controls, and multiple input options.
Rear view of the Redback A4037 40W Public Address Amplifier, showing power input, 100V output terminals, mic inputs, line inputs, and various output connectors.
Front view of the Redback A4043 60W Public Address Amplifier, featuring volume controls, treble and bass controls, and multiple input options.
Front view of the Redback A4047 100W Public Address Amplifier, featuring volume controls, treble and bass controls, and multiple input options.
Front view of the Redback A4037 40W Public Address Amplifier, featuring volume controls, treble and bass controls, and multiple input options.
Rear view of the Redback A4037 40W Public Address Amplifier, showing power input, 100V output terminals, mic inputs, line inputs, and various output connectors.
Front view of the Redback A4043 60W Public Address Amplifier, featuring volume controls, treble and bass controls, and multiple input options.
Front view of the Redback A4047 100W Public Address Amplifier, featuring volume controls, treble and bass controls, and multiple input options.

Redback

Redback Phase5 40W, 60W & 100W 100V Public Address Amplifiers

$735.00
Quantity

A 4037

Wattage
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Meet the needs of medium-sized professional public address installations with the Redback Phase5 100V Public Address Amplifier. Designed for versatility and reliability, this amplifier is perfect for schools, public halls, workshops, and sporting complexes.

Delivers clean, consistent 100V line output across all wattage options, with a frequency response from 60Hz to 15kHz and total harmonic distortion (THD) of less than 0.5%. The rack-mountable chassis suits permanent installations where space and reliability matter.

Available in three output configurations:

  • 40 Watt (A4037) — suited to smaller halls and classrooms
  • 60 Watt (A4043) — ideal for mid-sized venues and workshops
  • 100 Watt (A4047) — for larger spaces and sporting facilities

All models support 100V speaker line distribution, making them compatible with standard 100V PA ceiling speakers and wall speakers throughout a building.

Redback Phase5 40W, 60W & 100W 100V Public Address Amplifiers

$735.00
Features
  • VOX Muting: Input 1 (mic or line) mutes inputs 2-3, and input 2 (mic or line) mutes input 3.
  • Three Balanced Microphone Inputs: With phantom power for clear and consistent audio quality.
  • Three Line RCA Inputs: For connecting various audio sources.
  • Bass and Treble Controls: Customize the sound to suit your environment.
  • 100V Line Output: Ideal for long-distance audio distribution.
  • Flexible Power Options: Operates on 240V AC mains or 24V DC for battery backup during power failures.
  • Short Circuit Protection: Built-in thermal overload shutdown to safeguard the amplifier.
  • 19” Rack Mount Kit Included: Easy integration into professional audio setups.
  • Tape Output RCA Sockets: For recording or connecting additional equipment.
  • Optional Add-ons:

A 4573 Alert/Evac Option Board: Generates pre-chime, bell, alert, and evacuation tones with adjustable delay.

A 4373 Digital Remote Volume Option Board: Allows remote volume adjustment via A 2280B wall plate.

  • Australian Designed & Assembled: Quality craftsmanship you can trust.
Specifications
  • Power Output:

    40 watts RMS (A4037)
    60 watts RMS (A4043)
    100 watts RMS (A4047)

  • Distortion: < 0.5% @ 1kHz
  • Signal to Noise Ratio: Typically 75dB below rated output. All inputs
  • Mic inputs: 50Hz - 10kHz, -3dB
  • Line inputs: 60Hz - 15kHz, -3dB
  • Output line: 100V
  • Mic 1-3: 3mV
  • Line inputs 1-3: 300mV
  • Speakers: Screw terminals
  • Current Draw:

    220mA Standby, 3A Full @ 24V DC (40w A4037)
    220mA Standby, 4.5A Full @ 24V DC (60w A4043)
    220mA Standby, 7A Full @ 24V DC (100w A4047)

  • Protection:

    1A AC fuse and 4A DC fuse (40w A4037)
    2A AC fuse and 5A DC fuse (60w A4043)
    4A AC fuse and 8A DC fuse (100w A4047)

  • Weight:

    7.1kg (40w A4037)
    7.4kg (60w A4043)
    9kg (100w A4047)

  • Dimensions: 423W x 225D x 88H mm

 

Input Connectors

  • Mic 1-3: 3 pin XLR balanced
  • Line inputs 1-3: RCA stereo socket
  • 24V DC power: Screw terminals
  • 240V AC power: IEC power connector
  • VOX Muting: 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

 

*Specifications are subject to change without notice.

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