Works good with Inew I6000 but only with "USB audio player PRO"
I got this for my HTC One X (circa 2012). Naively, I just plugged in a pair of Creative 630s directly into the DAC. It wasn't nice. Then a few months later I read that you need an Amp. It so happens I had an old Total AirHead Crossfeed Amp.
Ladies and Gentlemen, through an Amp this little DAC sounds unbelievably spacious, punchy and sweet trebled. I've never had such a huge jump in HiFi quality since the advent of the digital era. A mighty thanks to all involved in developing this wonderful product.
By using a different USB reveiver then the very basic adaptive PCM2706 chip, a higher bitdepth (24bit) and higher samplerates would be possible.
For best sound: There are Android player apps supporting bit transparent playback btw. . These bypass the internal mixer. Checkout "USB Player pro".
Tried to make it work, but is unfortunately not compatible with the Samsung Galaxy S4 mini.. Seems to be because the mini variant of the S4 does not support USB host mode. Works (and sounds) like a charm however (pnp) on the normal Galaxy S4.
Works great with my LG G2 (D802). I'm using this with O2 headphone amp and Beyerdynamics DT880-600/Shure SE215 SPE. Awesome audio quality! If we can get a self-powered version of this USB DAC, that will be perfect!