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Today the majority of compression drivers, either by inheritance or design, are based on the guidelines outlined by Smith. The suppression technique of Smith has been recently extended [7] using a more accurate analytical acoustical model of the compression driver geometry. From this work improved phase plug design guidelines have been deduced ...
The ring-radiator drivers are also known as "JBL bullets" because of their distinctive shape. The 375 was a re-invention of the Western Electric 594 driver but with an Alnico V magnet and a four-inch voice coil. The 375 shared the same basic magnet structure as the D-130 woofer. JBL engineers Ed May and Bart N. Locanthi created these designs. [4]