More on Amazon.com : http://www.amazon.com/gp/product/B00ADR2DC8?tag=purrfectcatdi-20 <br /> <br />Dayton Audio UM12-22 12 Ultimax DVC Subwoofer 2 ohms Per Coil <br /> <br />Thick one-piece Nomex honeycomb covered cone with woven heavy-duty glass-fiber <br />Tall-boy rubber surround for extra-long linear excursion without reducing cone surface area <br />600 watts RMS power handling <br />Copper shorting rings and cap reduce distortion due to inductance variations <br />Dual 2 ohm 2-layer copper voice coils