Bowers & Wilkins SA250 Mk2 Subwoofer Amplifier

SA250 Mk2 Subwoofer Amplifier

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 at 3.5inches, and weighing 11.9lb, 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.


Model SA250 Mk2
Description 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
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 250W
Input impedance 33kΩ
Signal / noise >80dB
Rated power consumption

95W - 1/8 full power

30W - Idling

<1W - Standby

Height 100mm (3.9 in) [88.5mm (3.5 in) plus feet]
Width 430mm (16.9in)
Depth 322mm (12.7in)
Front panel height 2U 88.1mm (3.5in)
Net weight 5.4kg (11.9lb)
Finish Black