What's the difference between dual voice coil and single voice coil subs?

A dual voice coil (DVC) sub has two separate coils, giving you more flexibility to wire for different impedance loads so you can better match your amplifier. The Skar EVL-12 D2 in this list is a dual 2-ohm design aimed at enthusiasts who want wiring options for SPL builds. Single voice coil subs are simpler to wire but less flexible. For most first-time installers, the wiring flexibility of DVC matters less than picking an amp that matches the sub's RMS rating.