A two-speaker sound system is commonly referred to as a stereo. Stereos are audio systems that use two or more speakers to produce sound. They are typically used for listening to music, but can also be used for other audio applications such as home theater systems. Stereos are designed to create a realistic sound experience by creating a sense of space and depth. This is achieved by having two speakers that are placed in different locations in the room, allowing sound to travel from one speaker to the other.