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Amazon.com: Infinity - Two KAPPA 10" (250mm) 450Watt RMS High-Performance Subwoofers, Switchable 2 OR 4 OHM : Electronics
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Infinity Kappa 1000W 10" Subwoofer with Selectable Smart Impedance 2 or 4 ohm 50667371326 | eBay
Infinity Reference-1270am Reference 12 Inch Subwoofer With Ssi (selectable Smart Impedance) : Target
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