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Amazon.com: Infinity KAPPA-800W Kappa 8 Inch Subwoofer with SSI (Selectable Smart Impedance) : Electronics
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Infinity Kappa 83WDSSI Kappa Series 8" subwoofer with selectable 2- or 4-ohm impedance at Crutchfield
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Amazon.com: Infinity Primus 1200 12" Inch 1200W Max Power Car Audio Subwoofer High Performance 4 Ohm : Electronics
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