Leslie Effect

The Leslie Effect is based on the sound of a loudspeaker cabinet containing a rotary reflector above a fixed loudspeaker unit and a rotating horn assembly that together creates a swirling and pitch-shifting sound. Further, the speed of rotation can be shifted between a slow and a faster mode. The Leslie cabinet is named after the inventor, the American audio engineer Donald James Leslie (1911-2004), who in the 1940s designed this cabinet in his search for enhancement of the sound of the Hammond (B3) organ.