Dual XNBP12D Bandpass enclosure with two 12" woofers at Crutchfield
Dual PB-1000 Pro – SVS
Pyle 10" Dual Subwoofer Box System-Rear Vented Design W/ Santoprene Surround 2x 800 Watts Max Power - Walmart.com
MTX 12 in. 1200-Watt Dual Loaded Car Subwoofer Audio Sub plus Box plus Amplifier plus Amp Kit TNP212D2 + AKS8 - The Home Depot
10" Dual Series Vented Subwoofer Enclosure for Car Audio - High Powered Sub Woofer Speaker with a 10 Inch Silver Paper Cone and Built-in Illuminating LED Lights - 2x500 Watt Max Power -