My comment was relating to the Russian Black model of the TH900 MK1 (non detachable cable). The new Onyx Black MK2 I would assume would have the Anniversary tuning, similar to all of the other recent color variations since the Sapphire but I do not know for certain.Per qua2k in this Reddit thread, the Onyx cans are the same as the red and green.
https://www.reddit.com/r/headphones/s/B4BMHWhaq2
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