Stereo refers to an audio setup that uses two separate channels, left and right, to create a sense of width, space, and direction in sound. By sending slightly different signals to each channel, stereo allows effects and instruments to feel more immersive and three-dimensional compared to a single mono signal.

In guitar and audio equipment, stereo is commonly used with delays, reverbs, modulation effects, and multi-amp rigs to enhance depth and movement. Stereo setups can make a sound feel wider and more spacious, especially in recording or live environments where separation between speakers can be clearly heard.