page_title: Hammond organ
section_title: Leslie speaker
hierarchical_section_title: Hammond organ / Speakers / Leslie speaker
caption_attribution_description: A Leslie speaker, with the cabinet made out of a clear acrylic plastic. Speaker owned by Chris Fischer, Boulder Colorado - keyboardist for Funkiphino
context_page_description: The Hammond organ is an electric organ invented by Laurens Hammond and John M. Hanert and first manufactured in 1935. Various models have been produced, most of which use sliding drawbars to vary sounds. Until 1975, Hammond organs generated sound by creating an electric current from rotating a metal tonewheel near an electromagnetic pickup, and then strengthening the signal with an amplifier to drive a speaker cabinet. The organ is commonly used with the Leslie speaker.
  Around two million Hammond organs have been manufactured. The organ was originally marketed by the Hammond Organ Company to churches as a lower-cost alternative to the wind-driven pipe organ, or instead of a piano. It quickly became popular with professional jazz musicians in organ trios, small groups centered on the Hammond organ. Jazz club owners found that organ trios were cheaper than hiring a big band. Jimmy Smith's use of the Hammond B-3, with its additional harmonic percussion feature, inspired a generation of organ players, and its use became more widespread in the 1960s and 1970s in rhythm and blues, rock, reggae, and progressive rock.
context_section_description: Many players prefer to play the Hammond through a rotating speaker cabinet known, after several name changes, as a Leslie speaker, after its inventor Donald J. Leslie. The typical Leslie system is an integrated speaker/amplifier combination in which sound is emitted by a rotating horn over a stationary treble compression driver, and a rotating baffle beneath a stationary bass woofer. This creates a characteristic sound because of the constantly changing pitch shifts that result from the Doppler effect created by the moving sound sources.
  The Leslie was originally designed to mimic the complex tones and constantly shifting sources of sound emanating from a large group of ranks in a pipe organ. The effect varies depending on the speed of the rotors, which can be toggled between fast (tremolo) and slow (chorale) using a console half-moon or pedal switch, with the most distinctive effect occurring as the speaker rotation speed changes. The most popular Leslies were the 122, which accepted a balanced signal suitable for console organs, and the 147, which accepted an unbalanced signal and could be used for spinet organs with a suitable adapter. The Pro-Line series of Leslies which were made to be portable for gigging bands using solid-state amps were popular during the 1970s.
  Leslie initially tried to sell his invention to Hammond, but Laurens Hammond was unimpressed and declined to purchase it. Hammond modified their interface connectors to be "Leslie-proof", but Leslie quickly engineered a workaround. The Leslie company was sold to CBS in 1965 and was finally bought by Hammond in 1980. Hammond-Suzuki acquired the rights to Leslie in 1992; the company currently markets a variety of speakers under this name. As well as faithful reissues of the original 122 speaker, the company announced in 2013 that they would start manufacturing a standalone Leslie simulator in a stomp box.
caption: A Leslie speaker with a transparent case
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