Bowers & Wilkins
Bowers & Wilkins Dual 8” Passive Subwoofer
Best in-wall subwoofer for audiophiles seeking powerful, hidden home theater bass.
Experience powerful, hidden bass with the Bowers & Wilkins ISW-4 in-wall subwoofer. Designed for custom installations, this subwoofer delivers deep, audiophile-quality low frequencies without being visible. It features two long-throw 200mm drivers capable of moving significant air for impactful sound. The ISW-4 is powered by a separate 250W Class D amplifier, the CDA-4D, ensuring it remains cool under pressure, making it ideal for intense movie scenes or music. Its semi-matte white finish allows for easy customization to blend seamlessly into any room.Experience deep, resonant bass with the Bowers & Wilkins Dual 8” Passive Subwoofer in sleek black. Designed to complement your home audio system, this subwoofer delivers powerful low-frequency sound reproduction. Its dual 8-inch drivers are engineered for clarity and impact, ensuring you feel every beat and rumble. Ideal for enhancing movie soundtracks and music, this passive subwoofer integrates seamlessly with your existing amplifier to create an immersive listening environment. Elevate your audio experience with the precision and depth that only Bowers & Wilkins can provide.Experience powerful, hidden bass with the Bowers & Wilkins ISW-4 in-wall subwoofer. Designed for audiophiles who desire impactful low-frequency output without visible speakers, this subwoofer features two long-throw 200mm (8-inch) drivers. It moves ample air for high-quality sound, all while being discreetly installed within your wall. The system is powered by a separate 250W Class D amplifier, the SA250 Mk2, ensuring it remains cool even during intense audio playback, making it ideal for music and movie enthusiasts.
$1200.00
Owner Satisfaction
4.5
/ 5
Category Rank
2811
/ 7250
#2811 in Speakers
Price vs Category Average
-18%
Below average
Drive units
22008
/ x mm ( in) Paper/Kevlar® cone
Who it's for
- System builders wanting custom power and sonic control
- Design-conscious listeners valuing long-term build quality
- Audiophiles seeking precise and textured low-frequency performance
Who should skip it
- Budget-focused buyers avoiding extra hardware costs
- Minimalists preferring simple, all-in-one audio solutions
- Casual listeners intimidated by complex component matching
Performance breakdown
Low Frequency Extension
Reaches down to 17Hz for deep, cinematic rumble in any room.
Installation Versatility
Designed specifically for seamless, hidden integration into custom wall cavities.
Aesthetic Integration
Paintable finish allows the unit to vanish completely into your decor.
Driver Performance
Dual 8-inch Paper/Kevlar cones move significant air for impactful bass response.
Amplification Efficiency
Dedicated Class D power ensures cool, reliable operation under heavy loads.
Build Quality
Robust construction provides the structural rigidity needed for high-output audio.
Key Specs
Drive units
2 x 200mm (8 in) Paper/Kevlar® cone
Frequency range
-6dB at 17Hz and 290Hz adjustable (EQ at A)
Frequency response
±3dB 21Hz - 200Hz adjustable (EQ at A)
Bass extension
-6dB at 17Hz (position A)
Power Handling
200W 8Ω (minimum 6.3Ω)
Dimensions
494mm (19.5 in) Height x 264mm (10.4 in) Width x 99mm (3.9 in) Depth
Cut-out size
485mm (19.9 in) Height x 255mm (10 in) Width
Net weight
6.4kg (14.1lb)
Features
- Discreet in-wall design for a clean aesthetic
- Dual long-throw drivers for powerful bass output
- Includes a dedicated 250W Class D amplifier (CDA-4D)
- Suitable for custom installation projects
- High-quality low-frequency reproduction
- Designed to move large volumes of air for impactful sound
- Semi-matte white finish for easy painting and integration
- Discreet in-wall design for seamless integration
- Dual long-throw drivers for extended bass response
- Flexible installation options
What customers say
Customers consistently praise the Bowers & Wilkins Dual 8” Passive Subwoofer for its exceptional sound quality and premium build. Users frequently highlight its ability to deliver deep, articulate bass that seamlessly integrates into existing audio systems, enhancing the overall listening experience without overpowering other frequencies. The design is often described as elegant and substantial, reflecting the brand's commitment to high end aesthetics. While acknowledging its premium investment, many find the sonic performance and robust construction justify the cost, viewing it as a significant upgrade for serious audiophiles seeking precise, powerful low frequency reproduction.
Know before you buy
Yes, the ISW-4 is a passive subwoofer and requires the included external 250W Class D amplifier to function. This setup ensures the subwoofer remains cool and performs efficiently even during demanding audio playback.
Yes, the ISW-4 features a semi-matte white finish specifically designed to be painted. This allows you to customize the exterior to blend seamlessly into your room's decor.
The ISW-4 is designed for custom in-wall installations and includes a pre-mount kit for new construction projects. It is best suited for standard stud-wall cavities, but you should consult with a professional installer to ensure your wall structure can accommodate the 99mm mounting depth.
Despite its discreet design, the dual 8-inch drivers provide impressive low-frequency performance with a frequency response down to 21Hz. It is engineered to move significant air, delivering the deep, resonant bass typically associated with much larger, freestanding subwoofers.
Absolutely. The dual long-throw drivers are designed to handle both the subtle nuances of music and the high-impact requirements of movie soundtracks, providing a balanced and immersive audio experience.
You will need a cut-out space measuring 485mm (19.9 inches) in height and 255mm (10 inches) in width. The unit itself has a depth of 99mm (3.9 inches), so ensure your wall cavity provides sufficient clearance for the housing.
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