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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.

Created an aggregated device with both monitor speakers using Audio MIDI Setup

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

Volume HUD saying I cannot change the volume

Is it possible to have the volume play out of both monitor speakers? If so, what do I need to do?

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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'.

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  • So basically you can’t use multiple speakers in this case AND use the system volume?
    – RyDev
    Dec 17 '19 at 8:07

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