Description: The KICKER® CompVR® Subwoofer gives you incredible bang for the buck. Emphasis on bang! 12" CompVR 4 Ohm The reengineered CompVR 12-Inch Subwoofer is a 4Ω dual voice coil design, built for easy wiring. This subwoofer uses a large-diameter, progressive-roll spider and a Santoprene surround for truly linear cone movement. All this technology creates outstanding bass in a subwoofer built to make the mirrors shake. The CompVR Subwoofer works best with a sealed or ported enclosure for its substantial power handling. Specifications: SIZE [in, cm]: 12, 30 IMPEDANCE [Ohms]: 4 DVC Recommended Amplifier Power (watts RMS): 225-450 Peak Power (watts, per ANSI/CTA-2031-A): 900 SENSITIVITY [dB 1w/1m]: 86.9 MOUNTING DEPTH [in, cm]: 6-3/8, 16.2 MOUNTING DIAMETER [in, cm]: 11, 27.9 MIN SEALED BOX VOL [cu. ft, L]: 1, 28.3 MAX SEALED BOX VOL [cu. ft, L]: 4.6, 130 MIN VENTED BOX VOL [cu. ft, L]: 1.75, 49.6 MAX VENTED BOX VOL [cu. ft, L]: 2.25, 63.7