Infinity Kappa Perfect 12.1D - Car subwoofer driver - 350 Watt - 12" Maximized for performance in small sealed, vented, and bandpass enclosures. Perfect truly bridges the gap between subwoofers intended for SPL and those intended for sound quality. A huge flared, polished and vented polepiece is used to provide optimum cooling of the voice coil and minimize turbulence. If you're looking for a subwoofer that sounds great and hits hard, look no further