kodi 17 dts does not work, ok with kodi 16

Hello,
I can not get the DTS output that is displayed on my amp onkio with kodi 17. I handed the same thing as my kodi 16 which was showing me DTS.
It’s just written “multichannel” but never DTS then I have enabled passthrough
Thank you

Ps: the systeme is Qnap Ts-253A