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Amazon.com: H YANKA 12 Inch Subwoofer - 12 Inch Paper Cone Subwoofer Car Audio, Black Steel Basket, Dual Voice Coil 4 Ohm Impedance 12 subwoofer, 1600W MAX Power 12 inch Competition Subwoofer : Electronics
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V154DV2 - 15 Inch Dual 4-ohm High-Performance 550W RMS / 1500W MAX Power Handling Subwoofer - Cerwin Vega
DS18 EXL-XX15.2DHE High Excursion 15" Subwoofer 4000 Watts Max 2-Ohms DVC audio subwoofers