Thank you very very much.

I will contact with Zoom and ask for that you advise me but in the past they didn't answer my mail.

Thank you for your explanation and
when I recorded Moxf it was
max on 3/10 = 30% Gain on input 1 and 2 on Zoom Q8
and 75% slider on Moxf
I check Q8 and input 1 was set to 0db and input 2 the same 0db
Camera mics were off by buttons
Phantom power was Off
but I didn't use Q8 headphone port.
I listened by speakers on this recording or headphones in the Moxf on other recordings

Pan left and right was centered in Q8:

If input 1 is left channel and input 2 is right channel I must input 1 hard pan = 100% left and input 2 hard pan = 100 % right in Zoom Q8?

That's correct?

Moxf output was +6db