Hello Gizmo, Audio channels refer to the number and type of speakers used in a sound system to create surround sound. The format is usually written as X.Y.Z, where X is the number of regular speakers around you (like front, center, and surround), Y is the subwoofer for bass (the “.1”), and Z is the number of height speakers used for 3D sound effects, like in Dolby Atmos. For example, a 5.1 system has five speakers and one subwoofer, while a 7.1.2 system adds two more surround speakers and two overhead ones for a more immersive experience. More channels generally mean a more realistic and immersive sound, especially for movies and games. ~ Samsung Solutions