Bowers & Wilkins Active closed-box subwoofer system

ASW 700 This versatile subwoofer is compact enough not to physically dominate the smaller room, but powerful enough to fill the larger room with powerful, deep bass from either music or movie based sources. The 250mm (10 in) driver, with its composite paper-Kevlar® cone, large magnet and high-power voice coil, can move large volumes of air with exquisite control for accurate low-frequency output. To ensure the driver can perform in the relatively compact cabinet, the subwoofer features a powerful 500W amplifier to apply the necessary equalisation. Equipped with audiophile full-range Class-D circuitry and a switch mode power supply, the amplifier is extremely efficient and operates reliably cool.