Hey so my PC started making this weird sound after clean installing windows. Sound system is Logitech Z906 and optical cable from ASUS Maximus VIII HERO motherboard. Windows 10 latest build (1709). I tested, the sound system isnt the issue, as in MacOS ive never had this issue, only windows. In windows im using DTS 5.1 option for sound. Link to video https://www.youtube.com/watch?v=ut-K9OpSIFo&feature=youtu.be