b w isw 8High performance in wall subwoofer for custom installations Deep bass and high sound pressure, completely invisible The B&W ISW 8 is the most powerful passive in wall subwoofer in the Bowers & Wilkins Custom Install range, designed to deliver deep, controlled, high sound pressure low frequencies in dedicated home theater rooms and large spaces. Designed for in wall installation, it achieves a significant physical impact while maintaining a clean,