Their reputation for developing the most reliable products is legendary. The BassLine product line is their quest to give customers a quality product that won't break the bank. Surround and wattage match made in heaven.The 250 watts of continuous power that the W12S4 handles complements the poly-foam surround that Alpine went with. Polypropylene and mica cone with poly-foam surround. Recommended power range: 50W - 250W RMS. Recommended Sealed box volume: 1.09 Cu. Recommended Ported box volume: 1.91 Cu. Recommended Box Volume: 0.5-1.5 Cu. Frequency Response: 22 - 200Hz. 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! What's in the W12S4 package. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Other Car Audio". The seller is "nvdc-19" and is located in this country: US. This item can be shipped to United States.