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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Faital PRO 12RS1066 12 Inch Long Excursion Neo Subwoofer 4inch VC 2000 – SpeakerAddict
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Sundown Audio SAv2 10" inch DVC Dual 4 Ohm (SA Series) Car Subwoofer 1000 Watts RMS