Hi Thought Police.
There would be multiple ways to do this.
However, the easiest way would be to do just as you – as I assume – do now with your Homepods…….use Airplay.
Properly setup and configured you will be able to reach the 28’s directly from the Airplay menu of the Mac.
P.S.
May I ask, if you have concidered to have the 28’s in the ‘home theatre’ instead of the Homepod combo….assuming that those would be used for your tv?
They indeed would be great for movies etc.
MM
