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JBL - GX Series 12" Single-Voice-Coil 4-Ohm Subwoofer GX-1200 Black #221 z38/2 | eBay
Amazon.com: JBL Club WS1200 12" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics