Win10, Spotify active "Specified audio output device".

Support Windows 10 ONLY.

Instructions:
1. Quit Spotify if it is currently running.
2. Create a shortcut to Spotify on your desktop.
3. Right-click the shortcut and choose "Properties".

4. In the "Target" text field, add a space and then --enable-audio-graph after Spotify.exe.
It should look like this:
C:\Users\<username>\AppData\Roaming\Spotify\Spotify.exe --enable-audio-graph

5. Start Spotify by double-clicking the shortcut.
6. Choose "SHOW ADVANCED SETTINGS" on bottom of Settings.

6. You can now find a setting for "Playback device" in the advances settings in the "Preferences" view (Edit -> Preferences / Ctrl + P).