This is a nice quality Aiwa TS-W35U Subwoofer. It features an impedance of 8 ohms.
Optoma DK-SW50 50W Subwoofer. This Dolcen Kreiling 50W subwoofer is the perfect compliment to your home theater system. Featuring Digital Dynamic Bass Boost and up to 200 Hz response bandwidth, this subwoofer takes audio to another level.