Bowers & Wilkins ISW4

The ISW-4 is a passive subwoofer, meaning it requires the included SA250 Class D amplifier to function. This external unit provides the necessary 250W of power to drive the dual 8-inch drivers effectively.

The ISW-4 is designed with a robust, integrated back box specifically to minimize sound leakage. This enclosure helps contain the bass energy within your listening space while providing the structural stability needed for clean, accurate low-frequency reproduction.

While it is designed for in-wall mounting, the ISW-4 is best suited for new construction or major renovations. Because it requires a specific back box installation to ensure performance and sound isolation, retrofitting into an existing finished wall can be complex and often requires professional installation.

The two 200mm long-throw drivers are engineered to move a significant amount of air, which allows the system to produce deep, impactful bass despite its discreet profile. This dual-driver configuration ensures that you get high-quality, room-filling sound without needing a bulky floor-standing subwoofer.

Yes, the ISW-4 is versatile enough for both applications. Its audiophile-grade Class D amplification and long-throw drivers provide the precision needed for music and the power required for cinematic home theater effects.