| Although Hammond designed its own set of speakers, 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 (1913 - 2004). |
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| The Leslie system is an integrated speaker / amplifier combo |
| in which sound is emitted by a rotating horn over a stationary |
| trebel 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. It 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 |
| or pedal switch, with the most distinctive sound occurring as the |
| speaker rotation speed changes. |
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