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Help getting the correct audio out of my Logitech z906 speakers

Sohaib

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Dec 9, 2024
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Hello all, new user here.
So i recently build a new pc and i am having trouble getting surround sound from my system. Using my old system when connecting with Toslink from my motherboard to subwoofer i was getting 5.1 but on my new PC when i connect from motherboard's toslink to woofer the option of configuring speakers are greyed out. I have tried installing/reinstalling drivers multiple times without any success so i assume my motherboard can only send stereo via toslink. Another thing is that i also can't use DTS:X because it doesn't appear in spatial audio even though it is licensed and installed. Again it worked without any issue on my previous motherboard which was an Asrock x570 Creator.

My motherboard is: Asus Strix x870e-e:
This board only has 1 Optical S/PDIF out port and 1 Line Out Port.

My speaker system:

Looking at motherboard specs it specifically says "The LINE OUT port on the rear panel does not support spatial audio" so i take it connecting from 3.5mm to RCA will also only provide 2 channels right? Now I am at a loss here and trying to troubleshoot myself for over a week i am willing to spend some money to get an external DAC. I was looking at Toppings D10s or Toppings DC3 Pro+ for ~200$ options, will any of those help me get proper audio to all my speakers or is there some better and cheaper alternate available?
 
Just to verify, you are installing the audio driver from Asus listed here, right?

If you just need something to bridge USB out from your PC to Toslink, you can just use something like this. Or a full on external DAC like the Toppings will work too, just overkill IMO.
 
I have tried installing from Asus directly, used Asus DriverHub and also tried directly from Realtek here:

 
Yeah it's weird. The manual clearly shows the optical out but completely ignores it in the audio connections section.

I would just use the previously linked USB to Toslink adapter, as if you've checked all the settings then it's hard to conclude anything other than that Asus hobbled their Toslink port for some reason.
 
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