The Beginings of the Infamous White PA

This was the first PA system I built from plans I had designed in college 6 years prior. My reference source for this design had come from a book on loudspeaker design by William Cohen and If I remember right it was published sometime in the 1950's. There was math involved in the design of the horn but that was still in the area of 'cut and try'. I believe I constructed the W box sub from particle board. I still use that book today for passive filter design's. This was built around 1979.