external DAC & HiRes

[vesics]

Hi, two questions:

I have a Samsung S8

1) I connect an external DAC (E1DA 9038D) and it's recognized by APP, then 3.5mm to headphone, but the volume is low, even at Max. I tried two headphones.

2) I connect a Sony headphone on BT, APP says that the Hires driver is on; is the Hires decoded signal transmitted to the headphone or not because it's BT connected ?

[dwrae]

1) Does it read software volume or hardware volume underneath the slider in the volume dialog?

2) The app sends the HiRes audio into layers of the Android audio system. What happens exactly is unknown and differs for each Android device.