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Amazon.com: Skar Audio EVL-65 D4 6.5" 400 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
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Amazon.com: Alpine W12S4 12-inch Single 4 Ohm Subwoofer Bundle : Electronics
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Sundown Audio U-6.5SW-D4 6.5" Dual 4-Ohm 400W Subwoofer : Electronics - Amazon.com
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Amazon.com: CT Sounds OZONE-10-D4 1600 Watts Car Subwoofer Dual 4 Ohm : Electronics
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Amazon.com: JBL Club WS1200 - 12” Shallow mount subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm : Electronics
Amazon.com: DD Audio 1110-D4 10" 800W 4-Ohm Subwoofer : Electronics
