Dayton Audio UM12-22 12" Ultimax DVC Subwoofer 2 ohms Per Coil Thick, one-piece Nomex honeycomb covered cone with woven heavy-duty glass-fiber Tall-boy rubber surround for extra-long linear excursion without reducing cone surface area 600 watts RMS power handling Copper shorting rings and cap reduce distortion due to inductance variations Dual 2 ohm, 2-layer copper voice coils