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Abaca Audio 4 Inch High-End Shielded Woofer 4 ohm: perfect for replacing/upgrading or building bookshelf, surround, sound bar speakers, or other diy speaker projects.
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Aiyima 1pcs 4 Inch Subwoofer Speaker Unit Hifi 4 8 Ohm 100w Woofer Sound Speaker Home Theater Deep Bass Loudspeaeker - Speakers - AliExpress
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Ghxamp 4 Inch Woofer Subwoofer Speaker Unit Hifi 4ohm 40w Fiberglass Woven Basin Deep Bass Loudspeaekr Large Magnetic 1pc - Speakers - AliExpress
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5 Inch 130mm Car Audio Full Frequency Subwoofer 4 Ohm 60W Polyplastic Cap Paper Cone Red Bubble Edge Wood Box Modified Speaker| | - AliExpress
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TL3001A-4 Professional Speaker 12 Inch 325 Watt RMS Woofer 4 Ohm With and SPL of 91 dB | Mavin the Webstore
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