<Two Sheets, 43Hz Folded Horn

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Hello EPA. I see your comment and think the sim is really good, but am having trouble understanding how the throat chamber is modeled. I have it as 25l rear chamber and 4000cc throat, 531.00 ATC. How could I appropriate this in modeling software? I had it at 866.69 before because that would equate to a circle cut in the baffle for the driver. Is it just a much deeper cylinder now? Would I subtract the volume of the circle cutout to the VTC when building it?
 
Actually, in order for the ATC to reflect the cutout of the driver, it has to be 620.16 sq cm (assuming ATC is a circle), so that would make VTC 1116.00 to equal 18mm (assuming the driver is perfectly flat). And doesn't using using PEQ reduce delay? Or am I misunderstanding this?
 
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