As has been mentioned several times in this forum, the "ideal" frequency response of loudspeakers at the listening position is never flat. Studies by Harmon, B&K (see Fig 5: https://www.bksv.com/media/doc/17-197.pdf) and many other have shown this quite clearly. What is rather surprising is that it seemed to have taken Alon Wolf quite a while to figure this out and voice his speakers accordingly. The graph below superimposes the Valin M Pro response with an approximation of the "ideal" loudspeaker response advocated by B&K. It's not surprising that all Magico speakers post M Pro have a far more attractive sound to most listeners than their earlier work, which strived for a technically flatter response thus yielding a sound that was brighter and less balanced.
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Thanks for posting this. It is exactly how Apogee voiced their speakers. 10 dB down from low to high freq. This is something most modern speaker designers ignore.