From towing to travel, you depend on your truck to get you where you want to go, but can you rely on getting the best performance from your sound system? Now you can add deep, accurate bass in your truck without compromising valuable cabin space with the new R2-DB8V-TRK Dual 8 Alpine Halo R-Series Preloaded Truck Subwoofer Enclosure with ProLink.Alpine R2-DB8V-TRK Dual 8 Alpine Halo R-Series Preloaded Truck Subwoofer Enclosure. Designed for Trucks - These enclosures were designed to fit under the back seat of most full-size trucks. Two 8" subwoofers are preloaded into the compact enclosure and linked with a ProLinkT bracket that can be adjusted from 40" to 51 for a wide range of applications. Next-Gen Performance - The ported subwoofer enclosures feature the next generation 8 R2-Series Subwoofers with a more powerful motor that creates deeper, more accurate bass. Alpine Halo Design - The enclosure pulls design cues from the Alpine Halo Display with unique, curved edges outlined by a silver trim and a front link bracket cover with an Alpine logo badge.