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Amazon.com: JBL S2-1224 - 12” Subwoofer with enclosure and SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm, Black (S2-1224SS) : Electronics
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JBL - Two STADIUM122SSI 12" High Performance Automotive Audio Subwoofers with Selectable Impedance - Creative Audio
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