A2451 • 180W Active Subwoofer Amplifier


Cat. Page 105


  • $189.00
  • 2+ $179.00
  • 4+ $165.00
  • Price per each
  • Includes GST


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Last updated 23-10-19 03:20:10

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200mm (8") 70W Woofer Polypropylene Speaker


  • $59.00
  • 4+ $55.00
  • 10+ $49.00
  • Price per each
  • Overview
  • Specifications
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This completely self-contained amplifier module simply fits into the back of a sub-woofer cabinet. The unit will automatically spring into life from it's Standby mode once a signal is received. The Volume and Crossover Frequency Controls together with the Phase Correction Switch allows the sub-woofer to be set for a desired sound. Installation can be completed in just minutes, simply make a 235mmH x 175mmW cutout into the back of the enclosure and slip in the module. Overall depth is 100mm.


  • Auto power on/off with signal presence
  • High and low level inputs
  • High level outputs
  • Volume control
  • Short circuit output protection
  • Active crossover variable from 20Hz - 200Hz
  • Phase reversal switch

Recommended Project Idea:
Purchase an A 2451 and 2 x C 3088 8" Woofers. Ideal combination for a D-I-Y home theatre subwoofer. The 8" woofers employed result in a compact enclosure that could easily fit behind or next to a couch.

This project can be built to the following specifications:

40 litre enclosure
70mm diametre port
100mm port length

This results in a sub enclosure tuned to 45Hz.


  • Power Output: 180 Max @ 4Ω (0.5% THD)
  • Frequency Response(Variable): 20Hz - 200Hz
  • Roll Off Rate: 6dB/Octave
  • S/N Ratio: >64dB
  • Auto Turn On Sensitivity: 21mV
  • Auto Power Off Time: 15-20 Minutes
  • Input Impedance: (Line) 47k Ω, (Speaker) 200 Ω
  • Size of facia plate: 210 x 270mm.

*Specifications are subject to change without notice.

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