The cylindrical driver unit under the horn contained the diaphragm which was vibrated by the voice coil and sent to a flaring horn, which produced far more sound power from a given amplifier than a cone speaker.
The cylindrical driver unit under the horn contained the diaphragm. This diaphragm was vibrated by the voice coil. This diaphragm was sent to a flaring horn. A flaring horn produced far more sound power from a given amplifier than a cone speaker.