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Tang Band W5-1138SMF 5-1/4" Paper Cone Subwoofer Speaker
Bio 4" 160 Watt 2-Way Car Speaker Set - CT Sounds – CT SOUNDS
BOSS Audio Systems BRS40 4 Inch Replacement Car Door Speakers - 50 Watts Max, Sold in Individually
4 Inch (102 mm) 8 Ohm, Midbass Woofer
4 Inch High-End Shielded Woofer: perfect for replacing/upgrading or building bookshelf, surround, sound bar speakers, or other diy speaker projects.
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GHXAMP 4 inch 40W Round Subwoofer Speaker Woofer High power BASS Home Theater 2.1 Subwoofer Unit Crossover Louspeakers DIY 1PC - AliExpress