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I am using the Asus Phoebus sound card with a Schiit stack (Gungnir/Mjolnir) to power my Sennheiser hd800's. 


The last thread I made, someone recommended I use a toslink cable to use my Gungnir and Phoebus together instead of a USB solution. I purchased these cables:


Also, here is the online manual for the Phoebus and Gungnir:



Once I connected the cable to my Gungnir, and used the adapter provided by the Phoebus, I get no sound. None at all. I've tried playing with all the settings, all my drivers are up to date. I am out of ideas and it seems like I have to just go back to the USB.