I believe because the Xmos chip only works with usb out. Just use a regular USB C OTG cable, no big deal. I'm assuming you're trying to feed it to use the tube modes. I don’t know why anyone would use this as a transport.
As I wrote earlier on, It Is Just because I own a proprietary cable from Cayin that did wonders on other devices. Since the implementation of USB C to coax was an "historical" feature from them, I expected to be more interesting than that. I use the same cable with the xduoo XT II and It goes up to every frequency.
It Is to me interesting in order to be able to use i.e. Mojo when feeding High impedence cans, and I hoped this way to simplify my rig, getting rid of the xduoo. At the same time Mojo Is known to have a less than perfect USB implementation, hence the Need for classical coax. Hope the scenario Is more clear now.
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