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Speakerplans.com
Pair of Unloaded X1 - 18" Dual Bandbass Subwoofer Cabinets - Birch Ply | #531945953
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2014 x1 adding subwoofer - XBimmers | BMW X1 Forum
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BMW 1 Series F20/21, X1 E84 »FLAT-Line« WOOFER System - Jehnert Sound Design Automotive
