A 4031C • 30W 3 Input 100V Public Address Amplifier

Possibly the most popular PA amplifier ever sold in Australia, this 30W model is the mainstay of the small & medium PA install range, offering both 100V line and low impedance outputs. Suits a wide scope of installation applications, including schools, public halls, workshops and sporting complexes.

SKU: A 4031C Categories: ,

This PA amplifier has been designed to meet the requirements of small to medium sized professional public address installations. Frequency response extends from 40Hz to 10kHz at a total harmonic distortion (THD) of less than 0.5%. 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. Output may be 100V line or low impedance (8 – 16Ω) speaker loads. This unit features thermal overload shutdown, over current and short circuit protection.

Vox muting: 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.

Key Features:

  • 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
  • 240V AC operation
  • Built in short circuit protection
  • Thermal shutdown circuit protection


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.

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.

Power Output:. 30 Watts RMS
T.H.D.: typically < 0.5% @ 1kHz
Frequency Response:
Microphone: 52Hz – 10kHz, ±3dB
Auxiliary: 40Hz – 10kHz, ±3dB
Speaker Outputs: 100V (330Ω) (floating) or 8 – 16Ω (0V referenced)
Noise Level: All volume controls min: Typically 76dB below rated output (All inputs display same signal to noise ratio)
Dimensions: ≈ 300W x 220D x 80H mm
Weight: ≈ 4.1kg
Colour: Black
Accessories: IEC Mains Lead

Output Connectors
Speakers: Screw Terminals
Tape Output: RCA Stereo Socket

Input Sensitivity
Mic 1: 2.6mV Balanced or 3.2mV Unbalanced
Mic 2: 2.6mV Balanced
Mic 3: 2.6mV Balanced
Aux 1: 150mV
Aux 2: 150mV
Aux 3: 150mV

PTT Via Microphone
Switch Contacts
or Optional VOX Muting
-79dB below rated output

Input Connectors
Mic 1: 5 pin DIN balanced or 3 pin XLR balanced or 6.35mm jack unbalanced
Mic 2: 3 pin XLR balanced
Mic 3: 3 pin XLR balanced
Aux 1: RCA Stereo Socket
Aux 2: RCA Stereo Socket
Aux 3: RCA Stereo Socket
240V AC Power: IEC Type Chassis Socket

Input 1 (Mic 1 / Aux 1): Volume
Input 2 (Mic 2 / Aux 2): Volume
Input 3 (Mic 3 / Aux 3): Volume
Bass: ±10dB @ 100Hz
Treble: ±13dB @ 10kHz
Power: On/Off Switch
Power Supply: 240V AC
Indicators: Power on LED
Protection: AC Fuse 0.5A, DC Fuse 2 x 3A (internal)

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