Well I can confirm that the WMC-NWH10 cable does allow the use of digital line out from the ZX300 to an external DAC. I just tried it with a Modi 3 and it works flawlessly connected to the USB input. I was powering the Modi with the included power supply, so not sure it will work with portable dacs that rely on the source for power through USB.
I'm thinking about getting this cable to try with an RME ADI-2 dac, does the digital line out work when the ZX300 is in bluetooth receiver mode do you know?
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