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.
The 1920s have long been remembered as the Roaring '20s, an era of unprecedented affluence best remembered through the cultural artifacts generated by its new mass-consumption economy: a Ford Model T in every driveway. Amos 'n' Andy on the radio. the first talking motion pictures at the cinema.