Pyle PLPW6D 6In 600W Dual 4 Ohm Car Audio Stereo Speaker Subwoofer, Black - Walmart.com
Pyle Power Series Dual-voice-coil 4-ohm Subwoofer (6.5", 600-Watt) in the Mobile Audio department at Lowes.com
Amazon.com: Gravity 2X 6.5 Inch 600 Watt Car Audio Subwoofer w/ 4 Ohm DVC 6.5" Sub Pair - Feature Dual Voice Coil, Thick Magnet, Design for Car, ATV, Van, High Performance Car Show : Electronics
PYLE 6 in. 600-Watt Max Dual Voice Coil 4-Ohm Car Stereo Audio Power Subwoofer (3-Pack) 3 x PLPW6D - The Home Depot
DS18 ZXI6.4D High Excursion 6.5" Car Audio Subwoofer 600W Watts DVC 4-Ohm Quad Stacked Magnets
6.5 Inch 50W at 4 Ohm High Performance 2 Way Speaker with Crossover Dual Voice Coil and Dual Tweeter - China Dual Voice Coil and Dual Tweeter and Smart Home Ceiling Speaker