This issue goes back to one of the Win10 updates last year in which I lost my 5.1 sound on a SB Xi-Fi sound card. Afters days of reading, trying this driver & that, trying fixes reported here & elsewhere nothing fixed the problem. So, I then removed the
SB card & tried using the Realtek ALC892 5.1 onboard sound. Again no success & that was after, again days of reading & trying different drivers & various fixes.
So, I put up with just having 3 of the 6 speakers working & thought I'll get a newer sound card with Win10 drivers when I get around to it.
I bought an ASUS Xonar DGX & not to my surprise I still can't get 5.1 sound, again I have sound through only 3 speakers. Connected via analog not optical.
I have checked that the Microlab amp works on a friends Win7 system & it is fine, all the speakers work which I'd already tested way back last year, when this first happened.
The problem is Win 10. It became an issue with one of the builds & has just continued to be an issue. There is no DDL, DTS live, no enhancements tabs, or supported formats test, so Microsoft constantly giving us advice on updating your sound drivers etc
isn't going to help in many cases.
I can't roll back the Win10 updates either & have even done a system format & clean install, but that didn't help either.
I really do like Win10, but this is just beyond a joke, regular updates come through & yet this 5.1 Surround sound issue continues to plague a lot people. Think it's time to go back to Win7 & not recommend anyone to upgrade to 10.