Subwoofer Wiring Diagrams | the12volt This subwoofer wiring application includes diagrams for Single Voice Coil (SVC) and Dual Voice Coil (DVC) speakers. A SVC speaker has one voice coil and one set of terminals, one positive (+) and one negative (-). A DVC speaker has two voice coils, each with its own set of terminals. Because of this Subwoofer Wiring Diagrams | Sonic Electronix knowledgecelectronix›ToolsSep 29, 2014Using a subwoofer wiring diagram will ensure that the impedance between the subwoofer and amplifier match. Then you can make sure that the RMS power handling is in line. Failure to properly match impedances and power handling recommendations can void warranties and potentially damage the audio equipment.