Dear friend,FiiO's marketing is confusing. On the official M11 Plus ESS page it says the ESS9068AS supports DSD512 and 768 kHz (note the asterisk). But the actual specs for the DAP are DSD256 and 384 kHz. I think we are all pretty sure that the M11 Plus II you see on the one French site is actually the M11 Plus ESS.
Also see this:
https://www.head-fi.org/threads/fii...ted-at-2022-12-28.956910/page-9#post-16372048
Local playback: supports up to 384kHz-32bit/DSD256
USB Audio:768kHz-32bit/DSD512(Native)
So when connecting the M11Plus to the USB DAC which supports DSD512, you could play DSD512 file in the player at that time.
Best regards
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