$625.00 MSRP inc.GST

Redback – A 4157 – Amplifier Power – 2 x 250 Watt – 8 Ohm

This new series dubbed the “Apple” range have been completely redesigned by Biema to offer vastly improved cooling, efficiency and circuit protection. This range is designed to function as a high power stereo (non-bridgeable) amplifier for use in foreground sound reinforcement ie: pubs, clubs, cinemas and multi-function venues. The variable speed cooling fan and ‘T’ shaped heatsink tunnel ensure the amplifier performs well even in demanding conditions.
The protection circuitry employed ensures the integrity of the amplifier during overload condition, output terminal short circuit and output clipping. Each channel is fitted with a recessed front mounted volume level. Inputs are via balanced 3 pin XLR or unbalanced 6.35mm jack. Output connections are made via binding post or heavy duty Speakon connector.


  • Rugged heavy duty construction
  • 19” rack mount
  • Earth lift switch
  • 3 pin XLR and 6.35mm inputs.
  • Short circuit protection with indicator
  • Overload protection with indicator
  • Clipping prevention circuitry with indicator
  • Variable speed fan forced cooling
  • Muting circuit for switch on/off