Focal Sub 12 Dual 12" Subwoofer, Dual 4-ohm 300w Rms - 600 W Max : Target
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
Kenwood Road Series 12" Single-Voice-Coil 4-Ohm Subwoofer Black KFC-W120SVC - Best Buy
JBL Stadium 122SSI Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
TXX-BDC4-12 Subwoofer - Quad Stack | Audiopipe
Terminator 12" Series 4Ω Subwoofer | MTX Audio - Serious About Sound®