More on Amazon.com : http://www.amazon.com/gp/product/B004H669KS?tag=purrfectcatdi-20

OSD Audio S-12 12-inch High Powered Home Theatre 150-Watt Subwoofer Black

Speaker Type 12 High Performance Powered Subwoofer
Amplifier Power Output 150Watts RMS
Frequency Response 50Hz - 250Hz
Impedance 8 ohms
Dimensions H x W x D 16 14 x 13 x 15
Shipping This item does not ship outside the US