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Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package

Passive in-wall subwoofer with matching external amplifier and back-box

Item # 700ISW4SA

This package lets you enjoy the satisfying punch of great bass without a traditional sub taking up space on your floor.

This package lets you enjoy the satisfying punch of great bass without a traditional sub taking up space on your floor.

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Item # 700ISW4SA

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About the Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package

High-performance hideaway bass from Bowers & Wilkins

In my book, high-quality bass is an important component of any great-sounding stereo or home theater system. But not all rooms call for a big, boxy subwoofer taking up a large chunk of valuable floor space. Cue the Bowers & Wilkins ISW4 — a passive in-wall sub that delivers high-quality bass while hiding completely out of sight.

High-performance hideaway bass from Bowers & Wilkins

In my book, high-quality bass is an important component of any great-sounding stereo or home theater system. But not all rooms call for a big, boxy subwoofer taking up a large chunk of valuable floor space. Cue the Bowers & Wilkins ISW4 — a passive in-wall sub that delivers high-quality bass while hiding completely out of sight.

This package includes the ISW4 in-wall subwoofer, a matching external power amp, and an in-wall back-box — all the pieces you need for unobtrusive bass. 

Bowers & Wilkins ISW4 in-wall passive subwoofer

The ISW4 lets you enjoy high-quality bass without sacrificing floor space (shown as part of a Bowers & Wilkins in-wall home theater system).

Twin built-in woofers offer tight, responsive bass

The old adage of "two is better than one" can be applied to subwoofers. I personally prefer the performance of two smaller drivers that combine to move more air than a single larger woofer on its own. The resulting bass is tight and responsive — terrific for music and movies alike.

The ISW4 employs two 8" hybrid paper/aramid fiber cones to deliver deep, accurate bass all the way down to 21 Hz. It's an excellent choice for your in-wall home theater or stereo music system in a medium- or large-sized room. 

Contain and improve performance

This package comes with a back-box that mounts inside your wall prior to the sub's installation. It creates a sealed acoustic chamber, which focuses and directs bass output into your listening area while reducing the amount of sound that bleeds into the adjacent room.

Matching amplification included

The ISW4 gets its power from the bundled Bowers & Wilkins SA250 Mk2 — an external, rack-mountable amplifier designed specifically for the company's in-wall subs. The amp connects to your home theater receiver or preamp/processor via a subwoofer cable, and to the ISW4 subwoofer via in-wall speaker wire.

A rich history of audio excellence

Founded in England in the 1960s, Bowers & Wilkins is known worldwide for their innovative hi-fi speaker designs and their premium headphones. Crutchfield is proud to offer a diverse selection of products from this legendary audio brand.

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Product highlights:

  • in-wall subwoofer with back-box and matching external amplifier
  • ideal for a discreet home theater or stereo music system
ISW4 passive subwoofer:
  • dual 8" hybrid paper/aramid fiber woofers
  • frequency response: 21-200 Hz (±3 dB)
  • impedance: 8 ohms
  • includes non-resonant back-box to focus sound into your room
  • paintable grille to match your décor
  • installs between two 16" on-center wall studs
  • includes mounting bracket and hardware
  • dimensions with back-box: 13-5/8"W x 55-7/16"H x 3-7/16"D
  • weight with back-box: 35.3 lbs.
  • warranty: 2 years
SA250 Mk2 mono subwoofer amplifier:
  • 250-watt Class D amplifier
  • rack-mountable with included hardware
  • front-panel volume, phase, crossover, bass extension, and EQ controls
  • balanced XLR input and output
  • unbalanced stereo line-level RCA inputs and outputs
  • binding post speaker outputs
  • signal-sensing auto on/off mode
  • 3.5mm 12-volt trigger inputs for power-on and movie/music mode
  • 16-15/16"W x 3-15/16"H x 12-3/4"D (rack spaces: 2U)
  • warranty: 2 years
  • Our 60-day money-back guarantee
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More details on the Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package

Stacey B.

Features & specs

Features
Quantity in Package Single
Tweeter ---
Aimable Tweeter No
Woofer Composition Paper/Aramid fiber
Woofer Surround ---
Moisture-resistant No
Connector Type ---
Bi-Amp Inputs ---
Built-in Back-box Yes
Specs
Tweeter Size ---
Midrange Size ---
Woofer Size 8
Cutout Size ---
Power Range (Watts) ---
Sensitivity ---
Impedance (Ohms) 8
Frequency Response 21-200Hz
Parts Warranty 2 years
Labor Warranty 2 years

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