DESC: An aluminum woofer cone is used, mounted to a precision die-cast aluminum basket using a high- roll butyl surround. The basket is vented to provide additional cooling of the motor structure. Maximized for performance in small sealed, vented, and bandpass enclosures. Check out the Box and Parameter Sheet available for download. Kappa Perfect truly bridges the gap between subwoofers intended for SPL and those intended for sound quality. If you're looking for a subwoofer that sounds great and hits hard, look no further. A huge flared, polished and vented polepiece is used to provide optimum cooling of the voice coil and minimize turbulence.14mm linear one-way excursion makes the Perfect10.1 ideal for high output applications.