Features:

Alpine W12S4 12" 750 Watt Peak 250 Watt RMS 4-Ohm Car Audio Subwoofer
12" 4-ohm subwoofer
Polypropylene and mica cone with poly-foam surround
Stamped steel frame
Power handling: 50-250 watts RMS
Peak power: 750 watts
Sensitivity: 87.9 dB
Frequency response: 22-200 Hz
Top-mount depth: 5-5/16"
Sealed box volume: 1.09 cu. ft.
Ported box volume: 1.91 cu. ft.
Rockville RSV12XL Single 12" 1.6 cu. ft. MDF Vented Subwoofer Enclosure
Extra Large Enclosure For Large and Powerful Subwoofers
Single 12" Vented Enclosure
Machine precision cut mounting holes
¾" USA Heavy Duty MDF Construction
Top of the line Glue for extra durable adhesion
High quality GOLD spring loaded terminals
Designed, tested, and engineered to work with most of today's popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system.
Designed to give the best sound quality
Tuning frequency: 40Hz

• Alpine W12S4 12" 750 Watt Peak 250 Watt RMS 4-Ohm Car Audio Subwoofer. 12" 4-ohm subwoofer. Polypropylene and mica cone with poly-foam surround. Stamped steel frame. Power handling: 50-250 watts RMS.
• Peak power: 750 watts. Sensitivity: 87.9 dB. Frequency response: 22-200 Hz. Top-mount depth: 5-5/16". Sealed box volume: 1.09 cu. ft.. Ported box volume: 1.91 cu. ft..  
• Rockville RSV12XL Single 12" 1.6 cu. ft. MDF Vented Subwoofer Enclosure . Extra Large Enclosure For Large and Powerful Subwoofers. Single 12" Vented Enclosure. Machine precision cut mounting holes . ¾" USA Heavy Duty MDF Construction.
• Top of the line Glue for extra durable adhesion. High quality GOLD spring loaded terminals. Designed, tested, and engineered to work with most of today's popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system.. Designed to give the best sound quality. Tuning frequency: 40Hz.  
• The RSV12XL single 12" vented speaker box is made in the USA with Grade "A" ¾" MDF wood. This enclosure is made with precision cutting machinery by industry experts that have been making these enclosures in the USA for over 20 years. All Rockville enclosures come with a customized enhanced glue that is unmatched by any other manufacturer. That means that the carpet will stay in place and not rip or tear

Alpine W12S4 12" 750 Watt Peak 250 Watt RMS 4-Ohm Car Audio Subwoofer. 12" 4-ohm subwoofer. Polypropylene and mica cone with poly-foam surround. Stamped steel frame. Power handling: 50-250 watts RMS.Alpine