A type of electromechanical reverb device.It produces a reverb effect by inducing sound vibrations at one end of a long wire (which is coiled into a spring shape to reduce the amount of space it takes up, hence the name). Another transducer at the far end picks up the vibrations.As the waves reflect back and forth from one end of the spring to the other, and back, a reverb effect is produced. Spring reverbs are often criticized for their harsh, trebly sound (and susceptibility to external vibration), but they are inexpensive to build and have been used in the past in many highly regarded keyboards such as the Hammond organ B3 organ and the ARP 2600 synthesizer.

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