Alpine W12S4 12-inch Single 4 Ohm Subwoofer • 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! Bundle also includes one Alpine KTE-12PG 12" Grill Compatible with Bass Line Subwoofers, one Creative Audio Coozy, and one 4- Piece Car Door Trim Panel Dash Stereo Radio Installer Removal Pry Kit.