Good Morning Andrew, Simon, and Rafal,
Andrew, that was going to be my next step in troubleshooting - eliminating the OS out of the equation.
I am not looking forward to it if the issue can't be resolved by software!
And yes, its like the amp is driving the speaker to clipping and making the sound very, very tinny.
The normal ping sound you get when you adjust the volume level doesn't sound right at all - regardless of volume.
Simon, I did see someone mention online about audio enhancements.
I believe I found the setting and it made no difference.
Rafal, it so happens that they both worth in our Technology workshop.
One is wood and the other metal and I do recall finding a little tiny bit of metal shavings near the hinge for one of the two devices.
We have a second wood teacher who has yet to experience the issue.
I'll have a look at them internally shortly, luckily I have purchased a set of plastic shims and pry tools to ensure no marring on the case.
I wish they still had the easy to remove covers or just rely on screws to marry the shell up!