Caliber CALBC108US - 8" 20cm 500 Watts Under Seat Car Van Active Subwoofer With Wired Bass Remote ControlCaliber BC108US 8" 500 Watts Amplified Under Seat Active Car Sub Subwoofer Bass Box Tube (Comes with Separate Bass Controller) The compact design makes it easy to install anywhere space is limited. The unit can be installed either under the seat or in the boot area or even behind or under a panel. The solid construction ensures that the bass response is powerfull and will compliment any factory or upgraded audio system. Supplied with a subwoofer level