Sony SA-SW3 Wireless Powered Subwoofer for select Sony Sound Bars and A/V Receivers Boost the bass of your HT-A9 home theater system or HT-A3000, HT-A5000, or HT-A7000 soundbar with the Sony SA-SW3 6.3" 200W Wireless Subwoofer. It connects to your soundbar or system wirelessly for a quick, easy setup. The subwoofer uses Separated Notch Edge technology to control the stress along the edge of the driver's surround to allow for a uniform resonance of the driver, delivering clearer bass sound. Product Highlights: Wireless powered subwoofer for select Sony sound bars and receivers (sold separately) Works with compatible Sony A/V receivers Works with HT-A7000 and HT-A5000, and HT-A3000 sound bars Not compatible with other sound bars 200-watt built-in amplifier with Sigma Magnetic Circuit for powerful bass 6-3/8" woofer with front-firing ported (bass reflex) enclosure Separated Notch Edge technology mitigates stress on the sub's diaphragm for clear sound Dimensions: 7-15/16"W x 15-1/16"H x 16