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So if I researched right the Sony XBR-55X900B is a TV. This is what I found - The speakers are already more powerful than your average HDTV sound system, and you can further expand your audio capabilities with the optional SWF-BR1000 wireless subwoofer. It is wireless and you can find videos on youtube. The SACS9 subwoofer goes with the Sony Core Sound System. Not sure if this will work with the TV.
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