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Bowers & Wilkins ISW-3 In-wall Subwoofer System

This ISW-3 In-Wall Subwoofer System consists of the ISW-3 In-wall Subwoofer and a SA250 MK2 Subwoofer Amplifier.


IMS-4 In-Wall Subwoofer

Their range of in ceiling, in-wall and outdoor speakers follow this design philosophy and often incorporate truly innovative quirks and features

Both music and movies benefit greatly from extended bass performance, but a conventional subwoofer can compromise the decor of your room - step up to the B&W ISW-3 in-wall subwoofer and matching SA250 Mk2 amplifier and enjoy tight, tuneful bass without any visible subwoofer in your home.

B&W ISW3 features twin 165mm paper/ Kevlar cone drivers in a balanced design to eliminate vibrations, giving a frequency range of 21Hz to 222Hz, adjustable via the 250W class D rack mounting SA250 Mk2 amplifier.

SA250 MK2 Subwoofer Amplifier

The SA250 Mk 2 is a rack-mountable Class D amplifier, designed specifically to power and enhance Bowers & Wilkins' in-wall subwoofer models. This subwoofer is required when using either the ISW-4 or ISW-3 in-wall subs and will provide them with an incredibly powerful, yet stable response, allowing these subwoofers to reproduce bass to a superlative level of accuracy and control.

The SA250 Mk 2 can power two in-wall subwoofers at once.


Drive units 2 x 165mm (6.5in) Paper/Aramid Fibre cone
Frequency range -6dB at 21Hz and 222Hz adjustable (EQ at A)
Frequency response ±3dB 27Hz - 120Hz adjustable (EQ at A)
Bass extension -6dB at 21Hz (position A)
-6dB at 25Hz (position B)
-6dB at 29Hz (position C)
Maximun Amp Power 250W
Impedance Nominal 8Ω (minimum 6.3Ω)
Dimensions Width: 330mm (12.9in)
Length: 470mm (18.5in)
Depth: 237mm (9.3in)
Net weight 12.5kg

SA250 MK2 Subwoofer Amplifier

Description 250W rack-mount amplifier with built-in subwoofer equalisation
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
Dimensions Height: 100mm (3.9 in) [88.5mm (3.5 in) plus feet]
Width: 430mm (16.9 in)
Depth: 322mm (12.7 in) Front panel Height: 2U 88.1mm/3.5 in
Net weight 5.4kg (11.9 lb)
Finish Black