A4172 • PA Amplifier Stereo 2x500W


Discontinued product
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Bridgeable “PA Series”. This monster Biema produces a massive 1500W into 8 ohms in Bridge mode, 750W per channel into 4 ohms or 500W per channel into 8 ohms. The massive power capacity together with enhanced engineering and design facilitates ultra service reliability, ensuring it is the perfect choice for both hire applications and for permanent installations. It performs tirelessly even in the most demanding applications and is ideal for nightclubs, sporting complexes, cinemas, mobile DJ’s, pub and club PA’s and bands. Engineered with two extra large heatsink tunnels cooled with thermally cued fans which reduce their speed at standby or low level inputs. To ensure superior reliability, the amplifier includes a host of protection circuitry permitting operation under the most demanding applications. Features include over-temperature shut down, short circuit protection and output limiting. Each channel includes its own recessed front mounted volume control, rear panel mounted XLR and 6.35mm jack balanced inputs with selectable sensitivity of 0.77V, 1.4V and 3.5V. Enabling input signals from a wide variety of source equipment. Speaker connections are made via heavy duty binding posts or industry standard heavy duty speaker connectors.


  • Rugged heavy duty construction
  • 19” rack mount
  • Stylish cosmetics
  • 3 modes of operation - stereo, parallel and bridged
  • Selectable input sensitivity
  • Soft start limiter
  • Earth lift switch
  • Limiter on/off switch
  • XLR & 6.35mm balanced inputs
  • Binding post & industry standard heavy duty output speaker connectors
  • Front & rear carry handles
  • Clipping & overload/overdrive protect indicators
  • Recessed detent volume controls for each channel
  • Thermally cued fan forced cooling


  • Output power (RMS): 2 x 500W (8Ω)
  • tested at 1kHz at <0.1% THD: 2 x 750W (4Ω), 1 x 1500W (Bridged 8Ω)
  • Freq. Response: 10Hz - 50kHz (-1.5dB)
  • Input sensitivity: 0.77V
  • Signal to noise ratio: >90dB
  • Dimensions (mm): ≈ 482W x 506D x 88H
  • Weight: 22kg
  • Note: Close up internal shot shown is for A 4180, however internals for both of these amplifiers look the same.

*Specifications are subject to change without notice.

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