JVC drvn DR Series 4-Ohm Subwoofer (12 Inch) in the Mobile Audio department at Lowes.com
Amazon.com: JVC CS-DR421 4" Inch Car Speakers, 220 Watts of Power, 110 Watts Each, 2-Way Coaxial, Built Tough, Perfect Factory OEM Replacements, Sold in Pairs : Electronics
JVC KS-DR2004D drvn Series compact 4-channel marine amplifier — 50 watts RMS x 4 at Crutchfield