I asked one of the engineers behind the M2 project directly and he confirmed the different versions of the D2430k is the same, but those for M2 is just cherrypicked for frequency response. I suppose I have non-M2 drivers because the two samples differs some in frequency response. A measurement microphone and some EQ solves that problem.
Unless one of them is wired incorrectly, of course. I feel the need to check..

One other thing that I found strange was the frequency response with Pos' Minidsp/Rephase settings. Here is the near field of the tweeter with his settings compared to tweaked settings I did with Hypex DLCP. Pos in blue;

Name:  pos vs tweaked.jpg
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