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 RDV12M Dual 12" 3.98 cu.ft. MDF Dual Chamber Subwoofer Enclosure Box
Designed For 12" Subwoofers
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 perfectly with high powered subs
Designed to give the best sound quality
Tuning frequency: 41Hz

• 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 RDV12M Dual 12" 3.98 cu.ft. MDF Dual Chamber Subwoofer Enclosure Box . Designed For 12" Subwoofers. 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 perfectly with high powered subs. Designed to give the best sound quality. Tuning frequency: 41Hz.  

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