In the 1920’s US companies, Bell Labs & Western Electric did most of the pioneering work behind the development of microphones, amplifiers and principles to do with the reproduction of sound.
In the period shortly after the Second World War, wartime developments created conditions for a major improvement of home-audio quality. New amplifier and loudspeaker designs were developed, featuring higher output power, improved frequency response and reduced distortion levels. These were coupled to similar improvements in loudspeakers which saw the emergence of separate tweeter and woofers interconnected by a crossover network.
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