Radius RK-LCH61 USB DAC/amp & Ne PLAYER:
Sony Xperia Z2 >> Radius RK-LCH61 >> Audio Technica ATH-MSR7 headphones
Ne PLAYER: another music player which includes its own USB audio user space / soft driver like USB Audio Player PRO or HibyMusic?
Anyway, it can play high resolution audio music files and output high resolution USB audio streams towards an external USB DAC (a generic music player like Neutron / Poweramp / Spotify / etc. has to interface with the Android media player framework which can only output 48kHz USB audio streams for the time being) https://play.google.com/store/apps/details?id=jp.co.radius.neplayer_ver2 http://bit.ly/1sLAHDq
96 kHz music file >> Ne PLAYER running on Xperia Z2 phone > 96 kHz PCM stream >> Radius RK-LCH61 USB DAC