Infinity Kappa 120.3se 12" 4-ohm Component Subwoofer at Crutchfield
Infinity 102.7w Kappa 10" subwoofer with selectable 1- or 4-ohm impedance at Crutchfield
Amazon.com: Infinity KAPPA-1200W KAPPA 12 Inch Subwoofer with SSI (Selectable Smart Impedance) : Electronics
Infinity Kappa 123WDSSI Kappa Series 12" subwoofer with selectable 2- or 4-ohm impedance at Crutchfield
2x Infinity 10" High-Performance 1800W Peak Power Car Audio Subwoofers (Bulk Packaging) Bundle Combo with JBL Compact Class D Car Audio Mono Subwoofer Amplifier, Complete Amp Wiring Kit - Road Entertainment
Amazon.com: Infinity Kappa 800W 8" 800 Watt Car Audio Subwoofer & Metra 82-8148 6" to 6-3/4" Speaker Adapter for Select Toyota/Lexus/Scion 1998-Up Vehicles, Black : Electronics