How to use dual speakers in macOS I am using macOS Catalina; there are 2 LG UltraFine displays with speakers in them. I can use one or the other fine, but it would be nice if I could use both speakers at the same time.

I tried making an aggregated device with the Audio MIDI Setup app as per the instruction of this Apple Support Article.



Whenever I try to change the volume, macOS says that I can't (it shows the volume HUD with a no sign).



Is it possible to have the volume play out of both monitor speakers? If so, what do I need to do?
You should create a 'Multi-Output Device' instead of 'Aggregate'.

You cannot control the volume with system control anyway. You could adjust volume in 'Audio MIDI Setup'.