Realtek is one of the best Windows HD audio managers out there. ... Mostly, if the audio drivers have issues, there will be no sound from the Realtek Digital Output.

They are taking digital audio and converting it to analog for the headset. In effect the USB speakers have a built in sound card. Also, I notice you have the RealTek digital output set as default.

My gaming PC has been running Windows 10 x64 since the alpha stage. It is now running a fully updated, non-insider programme Anniversary update build. Over ...