6.5 in. 400-Watt Car Audio Midrange/Mid Bass Poly Woofers Speakers 2 x W64 - The Home Depot
Sound Storm Cg8d 8 Inch 800 Watt 400 Watt Rms 4 Ohm Dual Voice Coil Car Audio Stereo Subwoofer With Polypropylene Cone And Foam Surround : Target
Dual Subwoofer Box System - 8'' 400-Watt Slim Mount Truck Audio Subwoofer Box - Rear Vented Design with Built-in Illuminating LED Lights, 2x400 Watts Max Power - Walmart.com
Massive Audio GTX Series 8-Inch 400-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com
Pyle 11.5-in 400-Watt Bluetooth Compatibility Outdoor Party Speaker in the Speakers department at Lowes.com
Pioneer 400 Watt Subwoofer, 10" - Walmart.com
55 Series 10" 2Ω Dual Voice Coil Subwoofer | MTX Audio - Serious About Sound®
Sundown Audio SD-4 8" inch DVC Dual 4 Ohm (SD-4 Series) Car Subwoofer 600 Watts RMS