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Amazon.com: Earthquake Sound SWS-8Xi 8-inch Shallow Woofer System Under-the-Seat Subwoofer, 2-Ohm (Single) : Electronics
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Amazon.com: Earthquake Sound SWS-10X Shallow Woofer System 10-inch Car 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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