Infinity 120.9w Kappa Series 12" subwoofer with selectable 2- or 4-ohm impedance at Crutchfield
Amazon.com: Infinity - Two Kappa 12" (300mm) 500 Watt RMS, High-Performance Subwoofers, Switchable 2 OR 4 OHM : Electronics
Kenwood P-XRW1202WB 12" Subwoofer in a Sealed Wedge Enclosure with a X502-1 eXcelon Series 1000W Max Power Class D Mono Amplifier with a KCA-RC01A Wired Remote Level Control - Creative Audio
12 inch Eminence Professional Series Replacement Speaker – Eminence Speaker, LLC