Alpine W12S4 12" Subwoofer Bass you can feel!Alpine understands the importance of bass for the car audio enthusiast while keeping it budget-friendly at the same time. Overview:12-inch single 4Ω subwooferPolypropylene and mica cone with poly-foam surround250W RMS750W peak power handling5-5/16-inch mounting depthRecommended Sealed box volume: 1.09 cu. Ft.Recommended Ported box volume: 1.91 cu. ft Bass For AllThe 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 BassAn optimized magnet circuit allows more focused magnetism in the gap which results in improved efficiency. This means tighter bass control and more output!