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A4033B 30 Watt 3 Input PA Amplifier

  • 3 Input Mixer Amplifier Front
  • 3 Input Mixer Amplifier Back
$373.95 (inc GST) $339.95 (exc GST)
A 4033B
Calculated at checkout

Product Description

This PA amplifier by Redback has been designed to meet the requirements of small to medium sized professional public address installations, delivering an output power of 30W RMS.

Frequency response extends from 40Hz to 10kHz at a total harmonic distortion (THD) of less than 0.5%.

Great features such as push to talk (PTT) auxiliary muting, three combined balanced line microphone / stereo line inputs, tape out, and separate bass and treble controls give this amplifier a wide scope of installation applications, including schools, public halls, workshops and sporting complexes.

This amp has outputs of 100V line or low impedance (8 - 16Ω) speaker loads and features thermal overload shutdown, over current and short circuit protection.

The VOX circuit allows telephone paging via line input one or two (selectable internally). When paging via the telephone, all other line inputs are muted (ie. background music). Features variable sensitivity and time delay settings.



• Push to talk (PTT) muting on microphone 1

• 3 balanced microphone inputs

• Built in VOX muting circuit

• 3 stereo line inputs

• Bass and treble tone controls

• Tape output

• Output terminals for 100V line and 8 - 16Ω loads

• Built in short circuit protection

• Thermal shutdown circuit protection


• Power output: 30 watts RMS

• Distortion: < 0.5% @ 1kHz

• Output line: 100V or 8 - 16Ω

Signal to Noise Ratio:

• All volume controls min, typically 72dB below rated output. All inputs display same S/N ratio

Frequency Response:

• Mic: 52Hz - 10kHz, -3dB

• Line: 40Hz – 10kHz, -3dB

Input Sensitivity:

• Mic 1: 2.6mV balanced or 3.2mV unbalanced

• Mic 2: 2.6mV balanced

• Mic 3: 2.6mV balanced

• Line inputs: 150mV


• Volume 1: Controls mic 1 / line 1

• Volume 2: Controls mic 2 / line 2

• Volume 3: Controls mic 3 / line 3

• Bass: ±10dB @ 100Hz

• Treble: ±13dB @ 10kHz

• Power: On/off switch

Output Connectors

• Speakers: Screw terminals

• Tape out: RCA sockets

• Muting: PTT via microphone, switch contacts or internal VOX muting. -79dB below rated output

Input Connectors

• Mic 1: 5 pin DIN balanced or 3 pin XLR balanced or 6.35mm jack unbalanced

• Mics 2 & 3: 3 pin XLR balanced

• Line inputs: RCA stereo socket, bridged mono

• 240V AC power: IEC power connector

• Power supply: 240V AC


• Indicators: Power

• Fuse protection: 1A AC, 1.5A x 2 DC internal

• Size: 483W x 220D x 88H mm

• Weight: 6.9g

• Colour: Black

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