Bowers & Wilkins
BOWERS & WILKINS In-wall Subwoofer System
Best in-wall subwoofer for homeowners seeking powerful, invisible home theater bass.
Experience powerful, audiophile-grade bass without compromising your room's aesthetics with the Bowers & Wilkins ISW 4 In-Wall Subwoofer. Designed to be hidden within your walls, this system features two long-throw 8-inch Paper/Kevlar® cone drivers capable of moving significant air for deep, impactful low-frequency output. It's powered by a separate, audiophile-standard 250W Class D amplifier, the SA250 Mk2, ensuring cool operation even during intense audio playback. Enjoy a seamless integration of stunning sound and discreet design.
$1200.00
Owner Satisfaction
4.6
/ 5
Category Rank
1643
/ 6668
#1643 in Speakers
Price vs Category Average
-18%
Below average
Drive units
28
/ x in Paper/Kevlar® cone
Who it's for
- Homeowners maximizing floor space in smaller media rooms
- Minimalists prioritizing a clean, clutter-free living space
- Audiophiles demanding cinematic, high-fidelity bass performance
Who should skip it
- Listeners needing flexible placement for optimal room acoustics
- Renters or homeowners avoiding permanent structural modifications
- Budget-conscious buyers seeking affordable audio solutions
Performance breakdown
Low Frequency Extension
Reaches down to 17Hz for deep, cinematic rumble in any room.
Aesthetic Integration
Discreet in-wall design keeps your living space clean and clutter-free.
Power Efficiency
Dedicated 250W Class D amplification ensures cool, reliable high-output performance.
Driver Precision
Dual Paper/Kevlar cones deliver tight, responsive bass without unwanted distortion.
Installation Complexity
Requires professional wall integration and back-box mounting for optimal results.
Build Durability
Robust construction backed by a generous five-year manufacturer warranty.
Key Specs
Drive units
2 x 8 in Paper/Kevlar® cone
Frequency response
±3dB 21Hz - 200Hz adjustable (EQ at A)
Bass extension
-6dB at 17Hz (position A)
Power Handling
200W 8Ω (minimum 6.3Ω)
Subwoofer Dimensions
Height: 19.5 in, Width: 10.4 in
Cut-out size
Height: 19 in, Width: 10 in
Back Box Dimensions
Height: 55.4 in, Width: 13.6 in, Depth: 3.4 in
Impedance
8 ohms
Features
- Discreet in-wall design for a clean aesthetic
- Dual long-throw drivers for powerful bass output
- Includes a dedicated 250W Class D amplifier
- High-quality low-frequency extension for immersive audio
- Paintable grille to match your décor
- Designed for audiophile-grade sound reproduction
- Ideal for discreet home theater or stereo systems
- Delivers tight, responsive bass
What customers say
Reviewers consistently praise the acoustic performance, noting the deep, articulate bass that remains musical despite the concealed design. The system excels at delivering powerful, room-filling low frequencies while maintaining signature B&W clarity, perfectly integrating into high-fidelity setups without disrupting interior aesthetics. The exceptional build quality supports the premium brand expectation. The primary considerations are the substantial financial investment and the complexity of installation, as optimal sound requires pairing with a proprietary external amplifier. For serious audiophiles prioritizing stealth and uncompromising sonic excellence, the unparalleled performance justifies the high entry barrier and specialized setup.
Know before you buy
Yes, the ISW 4 includes a dedicated SA250 Mk2 amplifier. This external 250W Class D unit is designed specifically to power the subwoofer, ensuring it receives the correct signal and power for optimal performance.
Absolutely. The grille is designed to be paintable, allowing you to blend the subwoofer seamlessly into your wall or ceiling for a discreet, custom look.
The back box requires a depth of 3.4 inches and measures 55.4 inches in height by 13.6 inches in width. You will need to ensure your wall cavity can accommodate these dimensions before installation.
Yes, the ISW 4 is engineered for audiophile-grade sound reproduction. Its dual 8-inch Paper/Kevlar drivers provide the tight, responsive bass necessary for high-fidelity music as well as the deep impact required for cinematic home theater experiences.
The subwoofer offers a frequency response of 21Hz to 200Hz, with bass extension reaching down to 17Hz at the -6dB point. This ensures a deep, immersive low-frequency output that adds significant weight to your audio system.
Yes, the ISW 4 is versatile and can be mounted in either a wall or a ceiling. However, you should consult with a professional installer to ensure your ceiling structure can support the weight and accommodate the back box dimensions.
Still have a question?
Ask Hayley anything about this product before you decide.