5.1 and 7.1 sound mixing are audio formats used to create immersive sound experiences in films, music, and gaming. 5.1 Sound Mixing: Utilizes six channels, including front, rear, and a subwoofer, to provide a three-dimensional audio experience. 7.1 Sound Mixing: Expands on 5.1 by adding two rear surround channels for even more precise and enveloping sound, ideal for larger home theaters.