Sundown Audio Xv3 12" inch DVC Dual 1 Ohm (X Series) Car Subwoofer 2000 Watts RMS
Amazon.com: Bose Sub 1 Powered Bass Module for L1 PRO Systems and powered loudspeakers - Powered Subwoofer for Loudspeakers, Black : Musical Instruments
How to Wire Two Single 2 ohm Subwoofers to a 1 ohm Final Impedance | Parallel Wiring | Car Audio 101 - YouTube
Mtx 12 Inch Car Audio Dual Loaded Subwoofer Box, Crunch 2 Channel A/b Class Amplifier, & Soundstorm 8 Gauge Car Amplifier Wiring Kit W/ Rca : Target