Please note our VIC/NSW stores are open for click and collect only and CLOSED Sat/Sun. SA store CLOSED Sat/Sun.

$215.00 per ea

Quantity Price
ea $215.00
2+ $195.00
per ea
All prices shown are (inc. GST)


This Balanced Microphone/Line Pre Amplifier accepts either a microphone or line input for conversion to a balanced high level signal. Mic input is via a balanced XLR whilst the line input is via 2 x RCA sockets or 3.5mm jack. The 3V output signal is carried via Cat5e cable (suitable for distribution up to 300m without interference) to the A 4928 Line Output box which provides a balanced high or low level output and an unbalanced Aux output signal to be fed into an amplifier. Power is supplied via the included 24V Plugpack which is connected to the A 4928 Line Output box. Power is provided through the Cat5e cable connection.

The A 4928 has a 24V DC switched output (limited to 120mA current draw) which activates when the VOX output of the Balanced Microphone/Line Pre Amplifier is active.

Compatibility with other Redback Products
This box is also part of the accessories for the following Redback Products:
A 4480B 8x8 Audio matrix system.
A 4928 Single output microphone/line hub (for stand alone use).
A 4432 4+4 Channel Mixer With Wallplate Source Control

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


  • Input Mic Level Sensitivity: 3mV
  • Input Line Level Sensitivity: 1V
  • Music Input Line Level Sensitivity: 200mV
  • Output Connector: RJ45 8P8C
  • Input Connectors (Audio): 3 pin XLR balanced, 2 x RCA, 3.5mm JACK
  • Dimensions: ~133W x 65D x 44H
  • Weight: ~0.2 kg
    • *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.

Accessories (Sold Separately)