I just purchased a Node 2i and I have an optical link to the Krell S-1200, this is the DAC. I can play radio so I know the connection is working.
Next I installed ROON using the Node 2i as an end point. Here is where the fun begins. When a digital device is connected to the Krell S1200 and is sending PCM to the unit the display will show the rate of the input. So if I connect a SACD player to the Krell it will display 88.2 kHz, this way you know the sampling rate and that the device is acting as the DAC. When I connect the Node 2i select external DAC the DAC displays Stereo, this is the signal it is receiving. So no PCM to the DAC from what I can see.
Next ROON fails to play, I have to change the zone Max Sample rate to 96kHz (Max Sample Rate) and then Node 2i works. This is confusing I thought the Node 2i would support a max of 192kHz but it appears that is not so. The ROON interface is converting the 192kHz to 92kHz and then sending it to the device. If I set the MAX Sample rate to 192kHz it does not play.
I don't think your device can do what i though it could, it can't handle anything above 96kHz. I will wait for your answer but I think I will be returning the device.
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