I bought a divisive cable Kjell o Co who share a USB female to two USB males, covered over the two +/- power supply lines from The laptop and connected to a storage battery of 2600mA that is enough to play for 20 hours, but the difference in sound even against the taking usb power is incredible, the next improvement will be to add a couple of plastic film and electrolytes over uSB battery to help the battery with his little sticky chemical electron hiking. this is my first DAC when I'm done, I will go around the shops and see if there is anyone regardless of price range as this jacket. only then will I upgrade. I forgot running apps foobar2000 and JRiver this is important to circumvent the computer's destructive influence on the sound.
ps speaking of cables to the phone as I drive this micro-USB3 cable Samsung phone, see below no glitches.
I have mine connected to a LG G3 via an angled OTG cable from Kjell & co. Micro-USB connector of the cable is no longer making it unstable vickig because it does not go all the way. A OTG cable from Audio Quest will be on the road which is probably better. If the phone rings at the headphone listening crackle bad, which I'm a little afraid to have the unstable plug making.
The sound? Listen Tidal HIFI and FLAC files stored on your phone via the B & W P7. At first I thought the difference was small compared to the phone's DAC. Although the details were there so it was like a deafness pressed the sound evenly across all registers. The son tested it on their computer but heard no noticeable improvement over the built-in sound card. Ominous. And it played low, quite sufficient for extended listening, but not if you want to hit the lots of a single song. Hmm.
Played anyway in two or three days and then suddenly it was as if a veil is lifted and the sound was there. It seemed to be a little better for each hour of listening. Now I might just concluded a total of 12 hours, so I hope for continued improvement. Having no experience of such a marked difference recording of electronics. Either way, it sounds very detailed, tight and fine, but the laxity, blurring and lack of shade you can imagine through the phone's built-in DAC. Had concerns about a sharp treble but I think it feels pretty soft, almost restrained, a little to the Marantz-direction.
Marked improvement in sound, yet without a WOW experience in large letters (= a star away)
The play is not really high, although slightly run B & W P7 (= a star away).
Does not excessive battery.
Does not heat.
Small, slim and stylish. Cool? Easily fits in your back pocket next to the handset.
There is no turning back now.
OK, now everything has worked out. Full pot for the DAC. The solution is called USB Audio Player Pro. Turns out that Android fuckar up the sound, and not send it out via OTG unspoiled. Perhaps there is something else tweak that fixes this, but nothing I've found. The app costs 61 SEK. and they may play in the Tidal. Wonderfully!