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Alpine PWD-X5 Compact powered 8" subwoofer with digital signal processor and 5-channel amp (25 watts RMS x 4 + 165 watts RMS x 1) at Crutchfield
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Amazon.com: JINGERL 5.25 Inch Subwoofer Speaker 4 8 Ohm 60W Woofer Audio Modification Deep Bass Bookshelf Loudspeaker for Home Theater DIY 1P (Color : 4 Ohm, Woofer Size/Full-Range Size : 5.25") : Electronics
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Amazon.com: 5 CORE Car Subwoofer Audio Speaker - 8 inch 4 Ohm, 1000 Watt Power, Foam Surround for Vehicle Stereo Sound System 90mm Magnet Loudspeaker Woofer Replacement Black WF 8"-890 1 PC : Electronics
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5 Inch Speaker 5.25 Inch Subwoofer Speaker 134mm Woofer Strong Bass Concave Bowl 8ohm 40w 56hz-4.5khz 1pcs - Speakers - AliExpress
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