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Amazon.com: JBL Club 1224 - 12” Subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm, Black : Electronics
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JBL STADIUM122SSI 12” High Performance 1350 Watts Peak Power Selectable Impedance Car Audio Subwoofer Bundle Combo with Class D 1500 Watts Peak Power Car Audio Mono Amplifier and Amp Wiring Kit - Road Entertainment
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JBL Stadium 122SSI Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
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Amazon.com: JBL Club 1224 - 12” Subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm (Renewed) : Electronics
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