<br /> <b>Matrix Mobilesound 15&quot; Dual Voice Coil Subwoofer:</b> <ul> <li>Custom tooled magnet cover and high-quality poly injection cone</li> <li>Oversize butyl rubber surround and dual high-temperature Kapton voice coils mix rugged durability with great sound</li> <li>1200w subwoofer has magnet structure with a custom-tooled magnet cover</li> </ul>