In Reply to: I think you're mistaken posted by Alpha Al on May 21, 2012 at 16:07:27:
I agree. The early Lansing large format drivers 284, 285, 284B etc. used a 2.5", 16 TPI threaded coupling to the horn and a 1.5" exit diameter. These dimensions were borrowed directly from the Fletcher Horn System built at Bell Labs in 1932. When Jim Lansing converted his driver to the three stud mount in about 1940 (model 287) the exit path was shortened a bit with the removal of the threaded portion and the exit then measured 1.4", as it has remained ever since.
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Follow Ups
- RE: I think you're mistaken - Steve Schell 19:04:42 05/23/12 (0)