This is a nice quality Aiwa TS-W35U Subwoofer. It features an impedance of 8 ohms.
Coustic subwoofers are designed to deliver high performance power at an unbeatable price. Polypropylene cone with excellent stiffness to weight ratio allows for high efficiency and high SPL. Large foam surround increases efficiency by further reducing weight. The all new Coustic subwoofers offer a solution for any enthusiast at an extreme value.
SubCasts allow you to make up to two subwoofers wireless. No programming, no assigning IP addresses, just plug Sub "out" into SubCast transmitter and power it up, then plug receiver module into subwoofer inputs and power it up. Subwoofers can now be placed anywhere in the room.