Matthew Buckett wrote:
That is not a headphone socket -- it is a line-level socket.Ok, not being an audio person, what is the differnce between a line level socket and a headphones socket?
Different voltage, different impedance.
Is a headphone socket for devices without build in amplifiers? and a line level socket the opposite?
Somewhat like that, yes.
Presumably using headphones isn't the cause of the very poor sound on the line level socket?
It is one cause -- but if it sounds differently in MacOS and in Linux, there's another problem, too. Segher