[Difference between output plugins]

the second one is more like a ''pure output''. 

Note that if you're using something like DSP manager or Viper4android, like Nicklst said, it will bypass it. 

I did a lot of tuning with ATHM50 headphone and viper4droid, with a nice convolver driver, and subjectively, I like more the sound from viper4droid, even if my phone is compatible with HD output and I run FLAC files.  

[List of Android Devices with Hi-Res Audio Support (Internal DAC)]

what makes it work or not? 

people have reported that OnePlus One and Oneplus 3t its working. 

But not on OnePlus 5 (stock OOS 8.1, snapdragon 835)  nor OnePlus 6.

 

On my OPO5, stuck at ''actual : 48khz'', slected 192khz'', and sound is cutting when enabled. 

 

 

edit  : nm, viper4android was overtaking it.