It is interesting that it comes right at the same place as the higher peak. I don't remember seeing that any any measurement I've done.
Maybe it's a phase cancellation with the port. What happens if you mask the port or move the mic a little bit?
BTW, is that your new impedance plot with the current port? I see that the second peak is higher than the first.



I have wooden beams across the ceiling every 2 feet, could this play a role?


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