Tip # 1: Select the audio output
Back in the old days (in other words, the last release of macOS, El Capitan) it wasn’t quite straightforward how to direct the audio on the Mac to somewhere other than the built-in speakers. In that release, assuming you set the preference to show the volume control in the menu bar, you could option-click and get a menu of choices such as AirPlay-compatible speakers.
No More! With the release of Sierra, Apple has decided to unhide the destination menu and bring it front and center. If you don’t have the volume control icon in your menu bar see the instructions below. If you do simply click on it and choose your destination.
If you don’t have the volume icon in your menu bar…
If you want to display the volume icon in your menu bar it’s easy to find. Open System Preferences and click on the Sound icon:
There is a checkbox at the bottom of that preferences panel to show the volume control in the menu bar. Click that and you’re good to go: