AKG started making headphones in 1949. AKG K120 DYN was the company's first headphone set. Many popular models followed later and AKG discontinued the film equipment business to focus completely on developing and producing audio transducers for microphones, headphones, and other audio products. In the 60's AKG introduced many interesting headphones models, such as the K141 and K240 studio headphones, and the K58 lightweight headphones. In the 70's one of the most innovative of all AKG headphones was introduced: K340, the world's first dynamic/electrostatic headphones. Only the K1000, that was introduced much latter, was more daring from an engineering perspective.