Amazon.com: Pair of Gravity G5 12 Inch 6000 Watt Package Car Audio Subwoofer w/ 4 Ohm DVC Power (2 Woofers) : Electronics
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
JBL P1224 Power Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
JBL 428F Professional High-Power Dual 18" 1600W Passive 4281F
JBL Power Series P1222 at Onlinecarstereo.com
JBL 1600 WATT POWER SERIES SPEAKERS for Sale in Oklahoma City, OK - OfferUp
JBL P1222 (P-1222) 12" Dual 2 ohm Power Car Subwoofer
Amazon.com: JBL Professional SRX812 Portable 2-Way Bass Reflex Passive System Speaker, 12-Inch, Black : Everything Else