Can't Direct Audio Ouput

I'm in resolve 16.2.7 on a 2017 iMac and don't understand how to direct the audio to my preferred speakers. I don't see a setting in Resolve itself ( though I'm still new to the program) and No matter what output I choose in the IMac audio volume menu item I always get playback from one of my 2 imac apple monitors. If I play a Youtube video or itunes song then the audio goes to whatever destination I choose.

Well as is often the case I figured it out myself.
Preferences> Video and Audio I/O> Speaker Setup>Use System Setting