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Redback Phase 4 PA Amplifier 250W 4 Input

SKU : A4385A

RRP: $950.00
Our Price: $752.10
Less: $197.90


  • Description
  • Reviews

Specifically designed for applications requiring up to three microphone inputs, without compromising output power and overall performance. The A 4385A features three inputs which can be configured for either microphone or line level operation. A 4385A conservatively delivers 250WRMS power. Frequency response extends from 50Hz to 15kHz ±3dB at a total harmonic distortion (THD) of less than 0.5% @ 1kHz. Vox muting is provided on inputs one and two, which, when activated, automatically mutes the other inputs. Bass/treble controls and phantom powering capability enable unparalleled flexibility for a wide scope of applications such as factories, workshops, mine sites, sports clubs and office buildings. Operates from 240V AC mains or 24V DC permitting battery backup operation during mains power failure. Output can be 100V line, 70V line or low impedance (4 - 16O) loads. Thermal overload, overcurrent/load protection circuitry and fuses on both AC and DC provide excellent fault condition protection and robust performance. Tape output sockets are provided for recording purposes or feeding into additional power amplifiers.






  • Multi-stage thermally cued fan cooling
  • 2U 19" rack mount (Ears sold separately)
  • Tape record out terminals
  • Optional alert, evac & chime tone generator (A 2073)
  • 3 mic input and 4 auxiliary inputs
  • Phantom powering available on all inputs
  • Vox muting on inputs 1 & 2.
  • Bass and treble tone controls
  • Terminals for 100V line, 70V line and 4 - 16O loads
  • 240V AC or 24V DC power operation
  • Thermal & fuse overload protection
  • Built in short circuit protection



  • Power Output
  • A 4385A: 250 watts RMS
  • Distortion: < 0.5% @ 1kHz
  • Signal to Noise Ratio: Typically 75dB below rated output. All inputs.
  • Frequency Response
  • Mic inputs: 50Hz - 10kHz, -3dB
  • Aux inputs: 60Hz - 15kHz, -3dB
  • Output line: 100V, 70V or 4 - 16O
  • Input Sensitivity
  • Mic inputs: 1.5mV balanced
  • Aux input 1: 300mV
  • Aux input 2-3: 500mV
  • Aux input 4: 500mV
  • Output Connectors
  • Speakers:Screw terminals
  • Input Connectors
  • Mic Inputs: 3 pin XLR balanced
  • Aux inputs 1-3: RCA stereo socket
  • Aux input 4: 3.5mm stereo socket
  • Tape Out: RCA stereo socket
  • 24V DC power: Screw terminals
  • 240V AC power: IEC power connector
  • Remote volume: Screw terminals
  • Controls
  • Mic inputs: Volume
  • Aux inputs: Volume
  • Bass: ±10dB @ 100Hz
  • Treble: ±13dB @ 10kHz
  • Power: On/off switch
  • Indicators: Power, Overload
  • Power supply: 240V AC or 24V DC
  • Protection
  • A 4385A 7.5A AC fuse and 20A DC fuse
  • Weight/ Dimensions
  • A 4385A: ˜19.5kg
  • Dimensions: ˜423W x 285D x 88H mm
  • Colour: Black

*Specifications are subject to change without notice.

  • Model: A4385A
  • Brand: Redback

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