Dolby Atmos is a popular surround sound format, a competitor to DTS:X, and it's found in everything from the biggest commercial cinemas to the smallest of home theaters. The "immersive" format is also being used as a new way to experience music from the likes of the Beatles to Ariana Grande on both mobile phones and speakers. While the biggest change from previous formats is the addition of height channels, Atmos soundtracks will work with a traditional five-speaker-and-subwoofer (5.1) system or as many (or few) speakers as you have.