Horn focal point question

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Greetings,

I am cutting this from pvc billet to make a resin cast mold from. (it will be attached to a BMS 4591 driver)

I have the math of the radius and horn, no problem. After looking thru many horn design posts, and many diagrams, I am stuck on where the focal point of the horn would be?

Is it 'A' or 'B' in this diagram?

Thanks for any help...

An externally hosted image should be here but it was not working when we last tested it.
 
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