Audio development 1900 - 2020

1900 - Mono radio

Mono radio 1900

Mono tube radio 1950

Portable transistor radio 1960

Portable transistor radio 1960

Stereo set 1970

Stereo set 1970

Stereo set 1980

Stereo set 1980

Surround stereo set 2010

Surround mulit speaker system 2000

String speaker