![]() The model 122 speaker is typically connected to a Hammond B or C series organ console. Gets started at the same time, because of the mass differences, each accelerates to its final speed at its own rate,Īnd when the motors are shut off, each decelerates at its own rate. There is no attempt made to synchronize the rotation of the two moving systems (their masses are different). There is a particular sound imparted as the rotors accelerate, and this is often used to good effect. Sometimes they are just pulsed on and off, left to coast to a stop, etc. The motors are not just turned on and left, rather, they areīy the musician, to control their speed via duty cycle The motors are underĬontrol of the musician, and controlled together. Some of the motors are two speed, but the majority found are single speed. Shaded pole AC motors drive the rotors, with a separate motor for each unit. A simple 2-pole (12-dB/octave)Ĭrossover divides the signals to the two loudspeakers. To rotate the 15" speaker, it is mounted above a rotating drum having an angled baffle that "sprays" the sound in a 360-degree arc when the drum is rotating. They differ in size as well as in the amplifier configuration.īoth use the same speaker components, a 15" speaker of no particular provenance, and a phenolic dome compression driver fitted to a rotatable horn. There are two basic Leslie Speakers (Leslie) found in common use today: The model 122 and the model 147. Ultimately the Leslie Speaker becameĪ product of CBS (the same folks who brought you the silver-faced Fender amps). November 29, 1949, uses the Doppler effect via a rotating loudspeaker horn or baffle to impart a tremulant effect to its input signal. Leslie, named for its inventor, Donald J. The Leslie Speaker, most commonly found attached to a Hammond Organ, has come to be used as an effect as well as the ultimate expressive device for the Hammond. Interfacing to a Leslie Speaker | Uneeda Audio ![]()
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