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Amazon.com: Earthquake Sound SWS-6.5X 6.5-inch Shallow Woofer System Subwoofers, 4-Ohm (Pair) : Electronics
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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 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-8Xi 8-inch Shallow Woofer System Under-the-Seat Subwoofer, 2-Ohm (Single) : Electronics
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