Question / Help Problem when streaming

So here is my setup.

Turtle Beach X11
Xbox One/PS4/Xbox 360
Elgato HD
A powered dx11

So here is the deal. I am trying to hear my audio from my pc and my console (using the dx11 device that turns optical cable into the needed 3.5 mm out for the headset)

I use a cheap headset splitter to make is so the audio from my pc and the audio from the dx11 can go together to go into the turle beach I use. When i do this, there is a strong buzzing sound that is audible through my headset and my stream. Very low and annoying. I think it has a lot to do with the way the audio is powered from the dx11. is there something I am missing here?
 
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