I believe thase were built by Fat Julian in Atlanta. Try Julian's Audio in Roswell GA if it is still there.
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Multi dynamic driver (cones and domes) series crossover network "panel" speaker (infinite baffle style) for midrange and treble with seperate bass reflex woofer cabinets, typically with woofer facing room corner to load up the bass output. I heard them at Audio Art in Richmond VA back in the early 80's. Great "you-are there" sound! I don't think John made too many pairs because of their size and cost. I have a print-out of one of the patents John obtained for the series network crossover that provides details about the Model 9.