Item Type: Passive Subwoofer. Maximum Power: 100W. 1 x Subwoofer. This device is a pure subwoofer and requires your amplifier or TV to support pure low frequency output. Enhanced Bass Surround Effect: Utilizes ground low pass filter effects to purify low frequencies and reduce their directivity, boosting the surround feel of the bass for a more enveloping sound experience.
eBay