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</ref> They devised a plug placed in front of a radiating diaphragm to control the transition from compression cavity to horn throat. They found that the bandwidth of the transducer could be extended to higher frequencies using their [[phase plug]]. They also outlined criteria for the design of the channels in the plug and suggested a path-length based design approach to maximize the bandwidth. Significantly, their plug moves the coupling point between the cavity and horn away from the axis of rotation. This change significantly improves the transducer response as the effect of the acoustical resonances in compression cavity is reduced. The paper described the first generation compression driver with a field coil magnet and phase plug, It used an aluminum diaphragm with an edge wound aluminum ribbon voice coil.<ref>{{Cite web |last=Dunker |first=Thomas |title=More references on horn loudspeakers |url=http://invalid.ed.ntnu.no/~dunker/refs02.html |url-status=dead |archive-url=https://web.archive.org/web/20181211003245/http://invalid.ed.ntnu.no/~dunker/refs02.html |archive-date=Dec 11, 2018}}</ref>
The first commercial compression driver was introduced 1933 when Bell Labs added a Western Electric No. 555 compression driver as a mid-range driver to their two-way "divided range" loudspeaker which was developed in 1931.<ref>{{Cite web |last=Plummer |first=Gregg |date=May 2, 2007 |title=The Short History of Audio/Video Technology |url=
In 1953 Bob Smith made the most significant contribution to modern phase-plug, and hence compression driver design, with his paper published in the Journal of the Acoustical Society of America<ref>
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