A Legend Was Born
Don Leslie created his spinning speaker cabinet to capitalize on a principle called the "Doppler Effect," the same principle that makes a train horn seem to go down in pitch when it passes you. The spinning horn creates an effect that is commonly referred to as tremulant: vibrato, tremolo, and a little "whoosh" of air all put together.
What Leslie probably never realized at the time was that he was creating a sound that would become legendary in popular music across many styles, and an amplifier technology that would be experimented with by countless musicians using a variety of instruments. Since that time, the Leslie name has become synonymous with not only rotating speaker technology, but with high quality instrument amplification in general.
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