For many years, the DT 109 has been the standard headphone/microphone combination for remote broadcasting, studio, film, TV and language laboratory application.
The headphone transducers offer tailored frequency response to improve speech intelligibility coupled with excellent isolation from ambient noise. The adjustable, noise-cancelling microphone provides clear and audible speech transmission for either live commentary or talkback applications.
Neat and stylish Western Electric 'Bell System' cameraman's headset rig. Used throughout USA television from the late 1940s. Our example, from ABC-TV, Hollywood.