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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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==Compression driver protection==
In some [[Sound reinforcement system|sound reinforcement]] and [[studio monitor]]s the high frequency drivers are protected from damage by current sensing self-resetting circuit breakers. When too much power is dissipated by the driver, the circuit breaker interrupts the flow of electric current. The circuit breaker resets itself after a brief interval. An older circuit protection technique used by [[Electro-Voice]], [[Community Professional Loudspeakers|Community]], [[UREI]], [[Cerwin Vega]] and others is a light bulb placed in series with the driver to act as a variable resistor. The resistance of the bulb filament is proportional to its temperature which increases as current flow through the filament increases. The net effect is that as the power increases the filament consumes an increasing share of the total power thus limiting the power available to the compression driver.<ref>{{cite web |url=http://www.audioxpress.com/magsdirx/voxcoil/addenda/media/seaandland.pdf |title=Sea & Land's Speaker Protection Devices |accessdate=2009-01-17 |url-status=dead |archiveurl=https://web.archive.org/web/20090407131736/http://www.audioxpress.com/magsdirx/voxcoil/addenda/media/seaandland.pdf |archivedate=2009-04-07
==References==
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