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Dange, thanks for going to the trouble of doing those calcs and graphs.
I have pointed out in my Room Analysis Primer V2, specifically that the frequencies on some software graphs are not accurate at all. They are not even intended to be.
What got my attention here was the frequency of the dip changing with listener distance. I was initially wrong in my comment on that. On reflection :-) I reckon that changing frequency suggests that this dip is caused by the floor bounce.
We are of course ignoring the wall and the ceiling.
Could you take a look at the original posters diagram and calculations please.
If 110Hz is simply wrong then perhaps this is a wall or ceiling bounce. In that case a thick panel, with FRK on the back, facing an equal depth airgap, would be a very viable solution. Such a solution would have the double whammy of being part of the RFZ.
That would be a great result, a collaborative and helpful one, normal, untainted. The best side of GS activity.
DD
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