Amazon.com: H YANKA 12 Inch Subwoofer - 12 Inch Paper Cone Subwoofer Car Audio, Black Steel Basket, Dual Voice Coil 4 Ohm Impedance 12 subwoofer, 1600W MAX Power 12 inch Competition Subwoofer : Electronics
Sony Xplod 12" XS-GTX 120LW Subwoofer 1200 Watt Max 4-ohm RATED POWER 350W | eBay
THW12D4 Hifonics ZEUS THETA 12 Inch 4 Ohm DVC Subwoofer | Hifonics
JBL Stadium 122SSI Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield