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Amazon.com: Earthquake Sound X84SWS 8-inch Shallow Woofer System Under-the-Seat Subwoofers with Gaskets, 4-Ohm (Pair) : Electronics
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Amazon.com: Earthquake Sound SWS-8X 8-Inch Shallow Woofer System Under-the-Seat Subwoofer, 4-Ohm (Single) : Electronics
DIY: Earthquake SWS-8Xi Under Seat Subwoofer Install - BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
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