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.
By the middle of the decade, prosperity was widespread, with the second half of the decade known, especially in Germany, as the Golden Twenties. The spirit of the Roaring Twenties was marked by a general feeling of novelty associated with modernity and a break with traditions.