I hooked up my Samsung Note 2 to an OTG and hooked it up to my headstage USB DAC hooked to a heastage arrow 3 amp-->Sennheiser 650s. I ran both poweramp and rocketplayer. I have to say the sound was disappointing. Not nearly as detailed as when the same rig is hooked up to my old ipod mini using line out. Am I doing something wrong here? The headstage USB DAC hooked up to any computer sounds incredible on the same setup. Is the Android messing with the files before hitting the DAC? I don't get it. I was very disappointed but realize that I am a newb to Android. Love the phone, can't even look at the tiny iphones anymore!!!!
Most USB DACs that are reported working here have been reported to sound the same as via a desktop/laptop to users here (including myself).
I wonder whether they is an issue of insufficient power supply, if you have access to a powered hub it would be worthwhile to try trouble-shooting that.