300 Watt Underseat 8 20cm Active Amplified Car Sub Bass Box Subwoofer. 8 900 Watt Super Slim Active Subwoofer. The 8 Super Slim Active Enclosure, boasts a massive 900 Watts of Power, enhancing your car audio system with crisp clear low frequency reproduction. The latest in design treatments ensure unparalleled bass performance and style.8 Under Seat Active Subwoofer with Bass Controller. Includes Bass Control Remote and Wiring Kit. Bass Controller & Wiring Kit. WxHxD 230mm x 340mm x 70mm. Our team is committed on dealing with enquiries quickly and efficiently.