@wlutke BlueSound has a pretty decent user forum, you might try poking around there to see if you can find more information about how to set up your specific devices.
As mofi said, if you're using the Qobuz app as opposed to connecting to Qobuz through the BluOS interface, you're probably connecting by Bluetooth. I don't think there's a way to connect using internet directly from the Qobuz app, however if you connect to Qobuz (or anything else) through the BluOS interface, it should be via the internet.
The Spotify app (outside of BluOS) will let you connect to devices on your network, but the Qobuz and Tidal apps won't to the best of my knowledge.
As mofi said, if you're using the Qobuz app as opposed to connecting to Qobuz through the BluOS interface, you're probably connecting by Bluetooth. I don't think there's a way to connect using internet directly from the Qobuz app, however if you connect to Qobuz (or anything else) through the BluOS interface, it should be via the internet.
The Spotify app (outside of BluOS) will let you connect to devices on your network, but the Qobuz and Tidal apps won't to the best of my knowledge.