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Bill Thomas did not end his association with the aeronautical industry with his departure from Marquardt Aircraft in 1949. During his tenure as owner of JBL, he kept ownership and operation of Kittle-Muffler and established a new subsidiary, Kittle-Lacy Inc., which was instrumental in the development of jet engine silencers. Thomas bridged his involvement in both the aeronautical and loudspeaker industries with the establishment of a fully owned subsidiary of JBL called Transducers Inc. in the 1950s.

This subsidiary was primarily known for developing test facilities to simulate high intensity noise and vibration conditions for the design of missile components. The above picture illustrates such a facility. The drivers shown are believed to be Transducers Inc. 375H compression drivers and 150H low-frequency drivers, designed and built by JBL. The 150H bore no relation to the 150-4C of 1953, or obviously, the 150-4H of 1985. It consisted of the chassis from a 130A with a cone derived from the LE15A. The heavier cone of the LE15A was essential in this application since the lighter cones of JBL#8217;s other 15#8221; drivers would not have withstood the high power levels. The 375H was a modified version of the JBL 375 using a stainless steel diaphragm that was considerably heavier, but more rugged than the standard aluminum diaphragm.

JBL established numerous facilities similar to that pictured above throughout the aeronautical industry, some of which remained in operation as late as 2000.

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E den till för att ta död på folk?

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