The loudspeaker is essentially useless its so quiet and crappy.
That’s actually a pure software bug.
I noticed that if the system is put some kind of quiet mode by an app, and the app exits, it sometimes fails to become loud again.
(By “quiet mode” I mean something similar to the music muting while more important stuff is played back.)
It is a pretty persistent problem, but I remember that at least once, I got it to be loud again.
I think it was not via that sound “improvement” settings thing, that is known to amplify the sound to clipping. I think it was a combination of changing audio profiles until one differed in one thing that toggled that “quiet mode”. Plus maybe some restarting and being sure before it all, that some services wouldn’t run.
I’m unsure about it, but because it once came and went away again, I’m certain it is a software thing.