I tried this with my IEMs, and they sounded muddy and lacking treble. For those, I recommend the 9018D. I think the problem is that the impedance on this is too high for IEMs. So it stayed in my closet unused for like a year, and out of curiosity I tried it with my HD800 -- now it was clear, the highs were there -- and the bass was POWERFUL. I'll be using this when I want to hear pounding bass with my HD800!
Just make sure your headphone has a high enough impedance!
Works a treat with my Asus Zenfone 2. No issue with the volume level control, which works independantly from the jack output.
Sound signal is cleaner and a bit more detailled than with the jack. Tested on Spotify HQ, with 3 headsets : Sennheiser PX-100 (great), Yamaha HPH-200 (greater!), and Asus intras which are not bad at all !
The sound quality is excellent ! The battery drain is OK,
It works great on my GALAXY S5.
The only problem I'll point out: The cable is too short and too stiff. It puts too much strain on the USB port of the phone. After a few month, the connection between the phone and the USB DAC became too loose, and I have a lot of 'USB disconnected' message on my phone.
Even the metal part at the end of the USB tip start to move inside the plastic jacket.
So be careful with it and everything will be fine.
I've had this over a long weekend and I really like the sound. I am using it with a Motorola moto g, 1st
generation, which I thought, had a great sounding headphone out jack. This is at least 20 percent better sounding. Maybe more. I am piping the signal to a fiio e12 mont blanc amp, then out to my headphones, either my AKG K240 studio or hifiman RE-400. Both sound noticeably better. I am streaming Tidal flac with no problems. No driver download, just plug and play. Nice.
Not a good experience for me. I received my unit badly scratched and blemished--it clearly had belonged to someone else before me. It may have been one returned previously, I'm not sure. Improvement in sound quality was negligible to undiscernible going from an S3 straight to headphones. While I was evaluating the product and weighing the pros and cons of returning it (having to ship back to China), the "generous" 7 day window for returns had elapsed. Not recommended.
Hifime reply: We are actually not that strict on the 7 day return window and we plan to change it to 14 days. Contact us if you'd like to return it. We can also receive returns to UK and Oregon, USA.
We get the cases we use for the DAC's from a supplier in China and they arrive like this, they all have minor marks and scratches unfortunately.