Everything looks ok and signal path is perfect and the midi settings shows 24/192 but no sound. Should it not support 24/192 through the headphone jack?
On late 2013 Macbook Pro 192/24 output seems to be supported, and so shows OP’s screenshot. But the receiving Onkyo doesn’t support it, and therefore no sound.
It’s Toslink optical output, not USB. Roon signal path will never show what’s downstream from the Mac’s digital out. I know well because I am using Toslink output to a DAC of mine, and that doesn’t show up, either. The user is supposed to configure the Toslink-connected DAC’s capabilities manually in the device setup. Roon can’t know what’s downstream…
FWIF, this is my signal path, with a Toslink-connected external DAC.
Yes, and this is supported on Ethernet and maybe USB. Have a look into the device’s manual. On Coaxial or Toslink digital inputs, your Onkyo only supports up to 96/24.
Yes and there are models where optical digital output is not supported. I happen to have a late 2103 MacBook Pro like the OP, but I don’t have a DAC to check 192/24 output over Toslink.
This is normal if you have set up your output device in Roon with exclusive access. In my case it looks the same, even if currently playing music from the optical digital output of my Mac:
Try to play 96/24 or have Roon downsample your 192/24 content to 96/24, to make sure your optical output is working fine.
You could probably connect your Topping DAC via USB to the MacBook, and going with the analog output of the DAC to one of the analog inputs of your receiver. In this case I would make sure the receiver isn’t going to digitize your analog input again… I don’t have experience with that device, but your manual should have that information for you.
If it were me, I would configure Roon to downsample to 96/24. This would very probably give you the best sound. And I bet you wouldn’t be able to hear any difference between 192/24 and 96/24, anyway.