There a several ways an Android phone can implement USB Audio. Depending on how much of the original framework is reused or replaced, you will get different results and a different impact on volume handling. Phone manufacturers are to a to a large extent bound to what their chip supplier has...

I believe you are confusing FLAC and WAV. FLAC is compressed and so must be decompressed, WAV is not. And I was not saying that the problem was due to processor load, I said it appears to be due to a recent software delivery. And with regards to root cause, I use the term as we usually do; but...

We have found an issue with FLAC files stuttering which appear to originate in a delivery from Qualcomm of FLAC decoding (though we have not done a thorough root-cause analysis). We managed to resolve this for Z2 and T2 but I am not sure how we did it. It could conceivably affect also other...

According to our expert, we cut off power and put up that message when the total current exceeds 500mA. This is in accordance with the USB 2.0 specification. 

Yes, as I wrote earlier today, the DragonFly does not work with any previous Xperia devices, only with Z2 and T2.   This afternoon we also confirmed my suspicion that this is due to the Dragonfly requiring 16-bit data to be padded to 24bits. I am not sure why some DAC's have that behaviour...

The DragonFly does not currently work with older Xperia products, and I have asked the team to investigate why.   With the new Z2 and T2 it "works" to the extent that we can play any supported sample rate and it sounds good. However, currently Android does not support volume control over USB...

The "Direct" output to USB should work with all media players which are using the "Player" component in the Android framework for music playback (basically, what this component does is opening a particular file upon request by the player app, and sending it to rest of the framework; when our...

  We do send out samples to journalists and reviewers just before product release, but that is usually handled by the local marketing organization. If we can agree about a few people which the forum trust to review thoroughly and fairly, then I will do what I can to convince our local marketers...

There are no changes in Android 4.4 which improves USB Audio, and Google has not gone public on any such improvements in the future. Basically, it is up to chip suppliers and OEM's to do such changes, which is difficult since the whole Android framework is buiot upon resampling into 48kHz/16...

You can also use a portable USB hub and a USB memory stick. I tested this today with an old 2-port hub, Dragonfly, and a 16GB Kingston stick. I tested the power consumption during 7 hours, at home and on a cartrip, and found that it consumes about 250-300mAh (overall power consumption with...

If you are at home, you can at least power the DAC through a powered hub. I just confirmed that the DragonFly and the Fiio E17 both works when connected through a powered hub (a 15 year old "MacSense" USB hub, no less). The DragonFly lights up even when the phone is not connected, and the Fiio...

There is a setting in the Fiio E17 which controls whether USB charging iscon or off. You can use that if you are in a situation where you could run out of power. When you ger home you can change it back and connect to a charger at the same time as you are charging your phone. If the DragonFly...