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Amazon.com: Passive Subwoofer, 150W High Power Passive Subwoofer, Home Audio Subwoofers, with 40mm Machine Base, for Home Theater Stereo System, 6.5 Inch, Black : Electronics
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12" Dual Loaded Compact Active Subwoofer System, 1200W Audio Bass Subwoofer Sub, 150W RMS Subwoofer Enclosure with Integrated Amplifier, Powered Subwoofer Box Compact Sealed Design for Car - Walmart.com