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 36 Hz for optimized sub-b. Alpine R-SB10V Pre-Loaded R-Series 10-inch Subwoofer Enclosure. Includes R-W10D4 wired in parallel. This enclosure is tuned to 36 Hz for optimized sub-bass performance.The item "Alpine R-SB10V Pre-Loaded R-Series 10-inch Subwoofer Enclosure" is in sale since Thursday, July 9, 2020. 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.