Ok so I have a quick question.
Galaxy S4 -> USB OTG -> Sabre Tiny DAC -> JDS C5 -> T-Peos H-200
Why am I able to change the volume from my Android device using PowerAmp? Is this considered true line out quality or is it the same as using the headphone out? Should I leave the volume on the Android device at 100% and control the volume through my amp?
This is normal.. it's just like using WASAPI out w/ your PC and still being able to control the volume of the digital output. keep your S4's volume at 100%.