(2) Alpine S-SB12V Loaded 12" 600w S-W12D4 Subw...

2 Alpine S-SB12V 12" Halo Series Linkable Ported Vented Loaded Subwoofer Enclosure  Alpine S-SB...

2 Alpine S-SB12V 12" Halo Series Linkable Ported Vented Loaded Subwoofer Enclosure  Alpine S-SB12V Pre-Loaded S-Series 12-inch Subwoofer Enclosure UNIQUE PROLINK™ DESIGNWhen you want to make a noticeable impact in your sound system, add a subwoofer to 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 build your bass with Alpine's new ProLink™ technolo...