I have a new M80 v4 and I can't see any writing on the speakers other than the Axiom around the front bezel. I don't know if you were talking about something on the back of the speaker driver.

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5