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Just to be sure, my querry was about the response at the high frequency not looking ruler-flat as compared to the rest of the curve,


You have to take into context the scale of the graph.
A drop of 0.2-0.6 dB is essentially inaudible to the human ear. If the Y axis scale were set to values of 2dB increments or more, the curve would not even be visible.

They say you can do anything with statistics but i say the advertising marketers do far more magical wonders with graphs.

"Those who preach the myths of audio are ignorant of truth."