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Amazon.com: Yamaha HS8 Studio Subwoofer with $50 Amazon.com Gift Card : Musical Instruments
Kanto SUB6 6-inch Powered Subwoofer, Matte Black : Electronics
Sony SACS9 10-Inch Active Subwoofer,Black : Everything Else
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Amazon.com: Polk Audio PSW10 10" Powered Subwoofer - Power Port Technology, Up to 100 Watts, Big Bass in Compact Design, Easy Setup with Home Theater Systems Black : Clothing, Shoes & Jewelry
Monoprice 60-Watt Powered Subwoofer - 8 Inch With Auto-On Function, For Studio And Home Theater Black : Everything Else
Amazon.com: BESTISAN 60Watts Powered Subwoofer, Bestisan Home Audio Subwoofers, Sub Woofer for Bookshelf Speakers/Sound Bar/Receiver, Subwoofer with Deep Bass(LFE/Stereo Line Input/Audio Output), : Electronics
Amazon.com : Cambridge Audio Minx X301 Powered Subwoofer Amplifier for Home Theater (Gloss Black) : Electronics
Amazon.com: Edifier T5 Powered Subwoofer - 70w RMS Active Woofer with 8 inch Driver and Low Pass Filter : Electronics