This is a nice quality Aiwa TS-W35U Subwoofer. It features an impedance of 8 ohms.
Indoor/Outdoor 170 watt multi purpose speakers utilize dual 3-5/8" woofers with a 5/8" ferrofluid midrange and a 5/8" piezoelectric mylar dome tweeter to provide outstanding sound in any environment. Can be used in a tabletop or wall mounted installation. Can be used vertically, horizontally or free standing with included brackets and hardware. Weatherized for outdoor use,