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Amazon.com: Infinity - Two Kappa 12" (300mm) 500 Watt RMS, High-Performance Subwoofers, Switchable 2 OR 4 OHM : Electronics
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Infinity Kappa K600 - Mono subwoofer amplifier — 600 watts RMS x 1 at 2 ohms - Mono block, 1 channel bass amplifiers - Custom Sounds & Tint
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Infinity Kappa 123WDSSI Kappa Series 12" subwoofer with selectable 2- or 4-ohm impedance at Crutchfield
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