I have a pair of 27" Cinema Displays attached to a Mac Pro running OS X El Capitan 10.11.3.
The displays have speakers. I'd like to play iTunes (or whatever else) through both sets of speakers at the same time and ideally, set the balance on the left hand display all the way to the left and the balance on the right display all the way to the right to give me a larger stereo sound stage.
System Preferences >> Sound only let's me select one Display Audio at a time.
Does anyway inherently or by third party exist to accomplish this?