When you’re looking to make a noticeable impact in your sound system, you add a subwoofer that will bring out the low ends of your music. But what if you already have a single subwoofer and still crave more bass? You could throw out your single enclosure and purchase a new dual enclosure or you can build your bass with Alpine's new ProLink™ technology. The KTX-H12 Linking Kit features ProLink™ technology and allows you to link two Single 12” Alpine Halo Preloaded Subwoofer Enclosures together to create a dual subwoofer-enclosure. Now you have the flexibility in power and price to use a single subwoofer or add another subwoofer when more bass is desired.