But again, using only one speaker will never produce perfect sound, even if it is a dual voice coil speaker.
Can I Use 6×9 Dual Voice Coil Speakers in My Car? What size speaker wire do I need to wire a subwoofer? A Dual Voice Coil subwoofer or dvc sub has four wiring terminal posts, two positve terminals and two negative terminals.
Wiring only one voice coil to a dvc is not bad for the sub, but it does indeed reduce power handling by half.
Subwoofers offer many other benefits.