Alpine R-SB12V Pre-Loaded R-Series 12-inch Subwoofer Enclosure Unique to Alpine, the subwoofer 10-inch and 12-inch enclosures are available as a single or linked format with an optional mounting bracket. This innovative design allows the sound consumer the option to easily add more bass to their system. The silver enclosure trim matches the steel bracketing and Halo display trim for a synergized look. The ported enclosure design delivers a higher total sound output for deep, powerful bass, reliable sound reproduction and overall great sound quality. This enclosure is tuned to 35 Hz for optimized sub-bass pe.Alpine R-SB12V Pre-Loaded R-Series 12-inch Subwoofer Enclosure. Includes preloaded R-W12D4 12 R-Series subwoofer. 12 Gauge OFC Speaker Box Wire. This enclosure is tuned to 35 Hz for optimized sub-bass performance. The item "Alpine R-SB12V Pre-Loaded R-Series 12-inch Subwoofer Enclosure" is in sale since Monday, May 24, 2021. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Car Subwoofers". The seller is "creative-car-audio" and is located in Springfield, Missouri. This item can be shipped to United States.