Alpine W12S4 12-inch Single 4 Ohm Subwoofer Overview: 12-inch single 4Ω subwoofer Polypropylene and mica cone with poly-foam surround 250W RMS 750W peak power handling Frequency Response: 32Hz-200Hz 5-5/16-inch mounting depth Recommended Sealed box volume: 1.09 cu. Ft. Recommended Ported box volume: 1.91 cu. ft Bass For All The 2017 BASS subwoofers are engineered to be fun and loud in a budget friendly category by combining retro styling with enough efficiency to run on 250W RMS. Performance: Efficiency & Tight Bass An optimized magnet circuit allows more focused magnetism in the gap which results in improved efficiency. This means tighter bass control and more output!