I repaired a broken JII xover board a while back and at the time drew a schematic. Most of the component values are there but some couldn't be measured withought dissecting it.
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Would you email me a copy? Would be great, even though I've recently learned that the components and component values could and do often vary from speaker to speaker, depending upon what the company had available. At any rate, if you're game you can reach me at firstname.lastname@example.org