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Other than breaking in there and unplugging the connector, there is no way I know of other than to just switch the audio device to the other speakers.
 
Do you mean the alerts? The sound control panel in system preference allows to to send audio and alerts to different speakers and to control the volume independently. So you can turn alerts off, or set the volume to zero, if thats what you mean.
 
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Yes, my Bose Companion speakers are plugged into the headphone jack on the back of my Mac Studio.
The Studio speaker is still active along with the Bose. This degrades the sound of the Bose.
None of the available controls allow me to mute the Studio. Help
 
Have you tried using Apple's utility Audio Midi Setup to modify your speaker selection?
I use it in Aggregate Mode, which is the opposite of what your looking to do, but you should be able to
set it up to only run your external speakers.
 
It the jack fully inserted? When I plug in, the studio's internal speaker is disabled.
I always thought it was a physical disconnect so that when the jack goes in, the internal speaker is disconnected.
 
I'm not certainthey still use physical disconnects but, if it is, inserting the plug part way will send audio to both external and internal speakers.
 
I just experienced yesterday, using zoom, even though the HDMI output speakers were chosen in System Pref, the built-in speakers were chosen in zoom.
 
Have you tried using Apple's utility Audio Midi Setup to modify your speaker selection?
I use it in Aggregate Mode, which is the opposite of what your looking to do, but you should be able to
set it up to only run your external speakers.
Perfect, thanks for the tip. Had to uncheck the button under the Mu.. column in the primary line.

Thanks again!
 
I just experienced yesterday, using zoom, even though the HDMI output speakers were chosen in System Pref, the built-in speakers were chosen in zoom.
Zoom has its own preferences panel that lets you choose input and output devices independently of the system settings.

Perfect, thanks for the tip.
If it works, it works, but it should be unnecessary - plugging in headphones should turn off the internal speakers, so something odd seems to be going on.

As for the System->Preferences->Sound->Output "Select a device for sound output", on my Studio, as well as offering the various USB and DisplayPort devices I have connected, it normally just offers "Mac Studio Speakers" until I plug in headphones, and then an extra "External Headphones" option appears & is automatically selected in preference to "Mac Studio Speakers" you can switch between them.
 
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