MTX Thunder5500 T5512-04 12" 4-ohm subwoofer at Crutchfield
MTX AUDIO TNE212D 12 in. 1200-Watt Car Audio Dual Loaded Subwoofer Box Enclosure TNE212D - The Home Depot
MTX Audio Boat Subwoofer RTS12-04 | 12 Inch 4-ohms 250W
Amazon.com: MTX Audio TNP212D2 Terminator Power Pack Subwoofer System - Set of 2,BLACK : Electronics
Amazon.com: MTX TN12-04 12 Inch Single Voice Coil 400 Watt Car Audio Bass Subwoofer and Q Power 12 Inch Single Heavy Duty Vented Subwoofer Enclosure : Electronics
MTX Thunder8000 T8124A 12" 4-ohm Component Subwoofer at Crutchfield