About the Alpine KTX-LK12 When it comes to bass, two is always better than one. Alpine's KTX-LK12 linking kit allows you to connect two Alpine S2-SB12 12" subwoofer enclosures to double your bass. The kit includes heavy-duty steel front and rear linking brackets to securely connect the enclosures as well as all the hardware you'll need. The front bracket's silver finish is made to coordinate with the enclosures' design, while the silver Alpine badge adds a touch of style. Warranty: 1 year. What's in the box: If you need assistance accessing this owner's manual, please give us a call. Front link Rear link plate 21" 3-Pin connection cable Four M5x25mm screws Four M5x12mm screws 4mm Allen key Installation instructions Other info: MFR # KTX-LK12 Item # 500KTXLK12 Features Overview: The Alpine KTX-LK12 Linking Kit lets you attach two Alpine S2-SB12 series loaded subwoofer enclosures (sold separately) in a side-by-side fashion. Installation: The KTX-LK12 includes a steel rear link-plate that bolts into pre-tapped screw holes on the back of each subwoofer enclosure. A front link brace supports the front of the enclosures while adding attractive cosmetics to the front of the assembly. Mounting hardware is included for installing the rear link-plate and the front brace. Linking Cable: A 21" 3-pin linking cable is provided that can attach to the Out port on one enclosure and the In port on the second enclosure, letting you power both subwoofers from one input connection. Compatibility: The Alpine KTX-LK12 Linking Kit is designed specifically for mounting two Alpine S2-SB12 PrismaLink subwoofer enclosures together.