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Sd (cone area) isn't the ACTUAL surface area of the cone or the volume of the cone. It's the area of the cone based on its diameter plus about 1/3-1/2 of the surround.
If I have a 6.5” driver that has a flat cone and a 6.5” driver with a deep cone (that’s the best way I can describe what I have in my head LOL) do I actually get more effective cone area? I know the SD will be the same but what about real world performance (let’s just pretend all other variables were the same)
 
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