Spring reverb is a classic type of reverb effect that uses a spring (or multiple springs) inside a unit to create reverberation. When the signal is sent through the spring, it vibrates the coils, creating a natural echo-like sound that mimics the acoustics of a large room or hall. This type of reverb became famous in the 1960s, especially in guitar amplifiers, and is known for its wet, metallic sound.

Spring reverb has a distinctive character, often adding a vintage, surf-rock vibe to the tone. It’s typically found in older amps or as a standalone effect in modern pedals. Although digital reverbs can simulate the spring sound, the real mechanical springs have a unique, organic quality, with some players using it for its warmth and charm.