Many other applications, for example softphones, can choose output individually from available sound output sources, from OS X 10.8 also airplay outputs. Suggestion for spotify is to have a controller for output next to volume slider, so spotify can use another output than the system default. This is even more important in Spotify Business, where a user interaction in another application never shall effect the music connected to a speaker system in a store or similar.
I'm sure this idea already exists, but I've searched and couldn't find this simple solution.
Hello and thanks for the feedback!
Any news regarding this request will be announced in the original idea topic here:
Please add your kudos and comments there, if you haven't already. 😉