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Amazon.com: Yamaha 10" 100W Powered Subwoofer - Black (NS-SW100BL)
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Amazon.com : Cambridge Audio Minx X301 Powered Subwoofer Amplifier for Home Theater (Gloss Black) : Electronics
Amazon.com: Powered Subwoofer, Bestisan 6.5" Active Home Audio Subwoofer with Bluetooth in Compact Design, Opt/RCA/Bluetooth Input, Built-in Amplifier for Home Theater, Receiver, Speakers, Deep Bass in Black : Everything Else