Powered subwoofer for MSP speakers, 180 watts, 10 Inch woofer
This is a nice quality Aiwa TS-W35U Subwoofer. It features an impedance of 8 ohms.
Railtones subwoofer provides additional bass support. Plugs into the wall and connects wirelessly to the railtones transmitter. Includes 4" driver. Railtones remote will also control volume on the subwoofer.