You often see 18, 16, or 14 gauge wire used for connecting a speaker to an amplifier. For car audio, 14 gauge speaker wire stands out as a top choice, especially if your system uses an amplifier or higher power. Many factory setups use 16 or 18 gauge, which can work for low-power speakers but may limit your sound quality as power increases. Choosing the right speaker wire gauge ensures your speaker receives full power and crisp sound.