The Blaupunkt 12″  Subwoofer (GTX12D) provides the perfect base tone for your car audio. Made with the highest technical quality to ensure maximum reliability and durability, the GTX12D 12″ car audio subwoofer features a high-quality polypropylene woofer cone and a 2″ high-temperature aluminum voice coil for the best audio, as well as a high-density foam surround to prevent vibrations to surrounding materials.