Amazon.com: DS18 SLC12S Car Subwoofer Audio Speaker - 12" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 500W MAX Power and Foam Surround for Vehicle Stereo
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SLCMD12 DS18 MD12 Car Subwoofer Audio Speaker - 12" in. Polypropylene Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 1000W
Power Acoustik MOFO-152X 15" 3000 Watt / 1700w RMS Car Subwoofer Sub MOFO152X - Walmart.com