When I use USB DAC using the new ESS 9280/9281C chipset USB audio dongles, the volume on the earphones come out too low even at max volume on s20 ultra. The same dongles and earphones sound tested with Note 9 running android 10, and windows 10 computers, sound output levels were correct.
When connected to S20ultra, sound volume is less than half of what it should be compared to when using note 9 on android 10 or windows machines.
Tested USB dongles where this happened:
Hilidac Atom Pro ESS9281C Pro
Zorloo Ztello ESS9281C Pro
And generic ESS9280 DAC earphones.