Infinity Kappa 122.7W 12" 1400 Watt Subwoofer From DVB Car Audio. 

These completely redesigned Kappa series subwoofers feature innovative woven glass-fibre cones for unmatched stiffness and damping ability. Coloration and distortion due to cone breakup is dramatically reduced the only thing you’ll hear is tight bass that plays through loud and clear.

The neodymium magnet assembly features an integrated heatsink for greater power handling and reduced mounting depth requirements. A flat progressive spider provides tight control at maximum excursion while the polished and vented pole piece maintains integrity when things start to heat up. Butyl rubber surround offers excellent cone-edge suspension and will not break down due to moisture or UV exposure.

The innovative pro-style wire terminals feature an integrated switch to easily choose between 1-ohm or 4-ohm impedance