How to Passthrough Audio on HIMEDIA Box?

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Hello everyone.

I'm selling Android box in Vietnam, and i really prefer HIMEDIA box. My website is xxxxxxxxxxxx
But anyone know how to use Android Box HIMEDIA to passthrough Audio to DAC?
i Know that HIMEDIA is perfect to passthrough DTS, DTS HD Video audio but can not passthrough Audio Lossless to DAC?
pls give me advise, i really appreciate.

Thanks

[looun]

himedia box not support USB dac , only nvidia shield support  USB dac
You can use only  SPDIF or  HDMI  DAC