Xover point for OB mid

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I have Altec 416s and Heil AMT dipoles from the 70s and want to add some drivers for the lower mids because I want more dynamics.
I have a pair of Ampex 692 suitcase speakers that supposedly were made by JBL. They are 8" FR that are supposed to go to 15K I guess starting just under 100 Hz or so. Bottom cross will be at 1000 Hz.
I don't know where I should cross from the 8" to the AMT and I don't know what kind of shape I should make the OB except that I have to have a shelf for the AMT and a base to brace the shelf to.
Please give me some ideas on what I should do.
Thank You,
Thatch
 
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