Jack Hammer series is loaded with features that make them rock. The product features rubber surround, the sewn directly onto the cone on the strength and voice coil that is wound 428 • High temperature wire, to ensure that the strokes of the categories, the roads are as long as you want to hammer. And it also has its own Spider MTX plateau ventilation, which push the hot air from the voice coil and bring the cool air helps by improving the reliability of the subwoofer and keep it cool even the hottest of the cars. Jack Hammer subwoofer have a number of asymmetrical linear drive to other subwoofers MTX that the flat progressive spider with an extended pole to smooth, linear movement for incredibly sharp, clear sound reproduction presented combined.