Audiovisual introductions in 1924

thumb|upright|Hi-fi speaker system for home use with three types of dynamic drivers The hole below the lowest woofer is a port for a bass reflex system.

thumb|right thumb|Moviola Model D (1927) with a microscope attachment (left) by Gaertner Scientific Corporation from 1940 A Moviola () is a device that allows a film editor to view a film while editing. It was the first machine for motion picture editing when it was invented by Iwan Serrurier in 1924.