The internal amp is very good
If you hear direct from the line out , you can here the pure sound from the sabre Dac chip .
And from the coax out has excellent SQ too .
That's why the pure sound from the line out is much better than from headphone out .
Please try it by your self than you can understand what I mean better SQ
I understand that you think the internal amp is very good. On the other hand you have earlier stated that the DAP sounds better with external amps, which means that the output from the onboard amp isn't as good. What I am getting at is: Why do you think it is so?