The simplest PA system consists of a microphone, an amplifier and one or more speakers. Whenever you have those three components, you have the potential for feedback. Feedback happens when the sound from the speakers makes it back into the microphone and is re-amplified and sent through the speakers again, like this:
Home SparkNotes â History Study Guides â The Great Depression (1920â1940) â The Roaring Twenties and the Jazz Age: 1920â1929.
Herbert Hoover Born August 10, 1874 (West Branch, Iowa)Died October 20, 1964 (New York, New York) U.S. president Herbert Hoover began the Roaring Twenties as secretary of commerce under President Warr...Read more.erbert Hoover Born August 10, 1874 (West Branch, Iowa)Died October 20, 1964 (New York, New York) U.S. president Herbert Hoover began the Roaring Twenties as secretary of commerce under President Warr... Read more.