SA-250 Mk2

The SA250 Mk2 subwoofer amplifier is specifically designed for use with the Custom Installation Series In-wall subwoofers, the ISW-3 and ISW-4. Deceptively slim it provides 250 Watts of power. The SA250 Mk2’s equalisation is custom tailored to the In-wall subwoofers, with a two position EQ switch to select between the ISW-3 and ISW-4.

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250W rack-mount amplifier with built-in subwoofer equalisation

Front panel:

  • Rotary volume (line in)
  • Rotary low-pass filter frequency (4th-order Linkwitz, 40Hz – 140Hz)
  • Low-pass filter defeat 2-posn switch
  • Phase 0º/180º 2-position switch
  • Bass extension 3-position switch
  • Movie/music EQ 2-position switch
  • On/auto/s

Rear panel:
Model select 2-position switch (ISW-3/ISW-4)

Amplifier inputs

  • 2x RCA Phono socket, line in
  • 2x RCA Phono socket, link out
  • 1x XLR socket, line in
  • 1x XLR socket, link out
  • 3.5mm jack – 12V trigger on/standby (overrides manual standby setting)
  • 3.5mm jack – 12V trigger equalisation movie/music

Amplifier outputs

  • 1x Neutrik® Speakon® 4-pole speaker socket
  • 2x pairs of Binding Posts

Amplifier power output

Input impedance

Signal / noise

Rated power consumption

  • 95W – 1/8 full power
  • 30W – Idling
  • <1W – Standby


  • Height: 100mm
  • Width: 430mm
  • Depth: 322mm
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