This problem persists on the same system with all the latest updates. I
did however notice that in the "hardware" part of the GUI there is no
longer a "2.1" option, so defaulting to analogue stereo output.
I tried connecting an external speaker ("headphone") and it sounded as
it should.
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https://bugs.launchpad.net/bugs/1903765
Title:
Subwoofer mapped incorrectly on Macbook 2.1
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