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Dange, again I don't really understand your point. 'Only' a frequency response graph? Let's remember the original question was quite specific, a 15dB dip around 135Hz, that seems like a frequency response question to me. The third octave test showed no change in the area of interest. Windowing of the FM measurements and Lupo's can show almost anything one wants to see, include a graph which indicates that the dip is worse with the panel.
Regarding the overall story of floors. I have seen it written elsewhere that we are very used to floor reflections so we can put up with them easier than a low ceiling. I wonder.
An important overlooked point of interest. I have carpet with underlay!
Seems like I am lucky, this should alleviate some of the higher frequency combing.
Final detail, being very fair and honest I placed a glass picture on the floor to get a clear reflection for my test.
DD
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