5.1 surround sound
- A surround sound system providing six channels, which are the left front, left rear, center, right front, and right rear channels, plus the subwoofer. Since the bandwidth of the subwoofer is reduced, it is considered as the .1 portion. Its abbreviation is 5.1 surround, or 5.1. Also called 5.1 channel surround, or 5.1 channel surround sound.
- synonym5.1 channel surround