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Sony SA-SW3 optional subwoofer for HT-A9/A7000 provides dramatic sound with 200W of bass » Gadget Flow
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SONY 12" 1800 WATTS Subwoofer & Bass Box with Sony 2 Way 840 Watts 6x9 Speakers & Sony 1000 Watts 4 Channel Amp - Amp Kit Package
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Customer Reviews: Sony XS-AW8 Compact powered under-seat subwoofer enclosure: 75 watts and an 8" sub at Crutchfield
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