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I have 5.1 audio with my windows but Spotify only uses the 2 front speakers, how do I get it to use ALL of the speakers?
Speaker fill makes NO DIFFERENCE!
Spotify doesn't support 5.1 out of box, like most other programs it outputs stereo audio.
However there are a few different methods on how to make Spotify play audio on 5.1.
Voicemeeter is one way to get it work - see this post on how to use it.
Another user also made it work by adding a specific line with quotation marks to spotify startup icon:
as seen here:
Let me know how you get on 🙂