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The HPS 8Wi Horizon wireless subwoofer incorporates high-quality components that produce the famous Boston sound. It is ideally suited for use in a high-quality 5.1 channel home theater or stereo music system. The HPS 8Wi is capable of impressive deep bass and high output from a remarkably compact enclosure. In addition, it features BassTrac, a proprietary Boston-designed circuit that tracks the input signal to the subwoofer and prevents its amplifier from being driven into audible distortion. The benefit: the bass stays clean and strong at any listening level.