Greetings everyone.
I have run across some early JBL speakers. They have an N500 crossover and include the original cabinet build plans, but they do not mention the driver compliment. The plans refer to a model 55060 using an N1200 crossover and a 55080 using an N500 crossover. On the plans, they are also referred to as Folded Horn Theatre System Furniture model.
In searching, I can find no references to such models, so am hoping someone here can point me in the right direction.