[bangdomarkin]

staff, a doubt. The battery of the devices will work distinctly, ie, the smartphone will have battery depletion by their common use of music playback and a DAC / AMP for their common use, or DAC / AMP will also make use of battery causing smartphone spend more than if you were playing music directly to the headphone jack? 
Sorry for bad english, I need the help of google translate.

 

[DanBa]

It depends on the type of USB DAC: bus-powered USB DAC or self-powered USB DAC.
Some USB DAC like the Apex Glacier can be operated in bus-powered mode or in self-powered mode.
 
 
USB powering [The basics]
http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/5310#post_10854839
 

 
A portable rig: Samsung Galaxy S III smartphone + Apex Glacier USB DAC/amp + JH Audio JH 13 Pro IEM
 
 

 
When the Android device is in USB host mode, it acts as a USB host and powers the bus, i.e. a bus-powered USB DAC/amp like an Apex Glacier in bus-powered mode.
 
 

 
The Apex Glacier can also be configured in self-powered mode: it draws power from its own batteries.
 
 

 
There could be a new type of self-powered USB DAC, the so-called "Charging USB DAC", which can power Android smartphones implementing the USB OTG - ACA (Accessory Charger Adapter) feature like Samsung flagship smartphones.
http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/2235#post_9403679
http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/2625#post_9614980

 

[DanBa]

RAVPower Filehub: wireless Samba-compliant network access storage server
http://www.ravpower.com/filehub-external-battery-charger-sd-reader-media-wireless-share.html
http://www.head-fi.org/t/633511/pictures-of-your-portable-rig-part-xvi/13695#post_10855950
 
music files stored on a 2TB USB hard disk drive connected to a RAVPower RP-WD01 Filehub >> Wi-Fi link >> Samsung Galaxy S3 using USB Audio Player PRO >> iFi nano iDSD USB DAC/amp >> headphones
 
 
 
 

 

 
 

 

[indieman]

Just got a galaxy s4 as a work phone. Does usb audio out work with apps besides usb audio player pro? Like Google Music all access?

 

[iron2k]

  Just got a galaxy s4 as a work phone. Does usb audio out work with apps besides usb audio player pro? Like Google Music all access?

Yes, it works with Spotify for example.
 
This is what I use:
Phone: Samsung Galaxy S4  (Android 4.4.2)
DAC/Amp: Total Bithead
Headphones: Grado SR325e

 

[vomvos]

I have the Ifi Nano idsd dac and have bought UAPP app from the Play Store to hear flac files BUT my Samsung Galaxy Nexus gives me sound full of skips and pops. I am in the quest for a new android phone. Nexus 5 and Moto G are in the top of my list. I want to ask you based to YOUR EXPERIENCE, and not what you read in the internet, if these compinations work flawlessly. If I use a micro-SD card in the 4g Moto X will the flacs play? Any recommendations for the Ifi based on your experience except Samsung?  

 

[greenkomodo1]

Is UAPP through the normal jack any good quality?

 

[SV_huMMer]

  Is UAPP through the normal jack any good quality?

As good, as any other decent player, cause the quality is determined by your phone's sound API and hardware. Which is usually.... well.... you know...

 

[thomascrown]

I guess the question was related to the issues vomvos had, probably to see if it's maybe the DAC and not the phone, part of the problem. In my experience my n5 can play flacs through uapp and my external DAC with no pops or noises, but anyway i wouldn't use it as source due the lack of storage.

 

[DanBa]

CyanogenMod USB audio & Google Nexus 5:
http://www.head-fi.org/t/627659/impression-tube-amp-bl-2-portable-miniature-tube-amp-from-china
https://forums.oneplus.net/threads/importance-of-the-audio-chip-any-audiophiles-here.147/page-5#post-28625
 
Nexus 5 running CM11 >> AudioQuest DragonFly USB DAC >> Tube Amp BL-2 >> AKG K701 headphones
 

 

[Driftbum]

Details on cables used? 

 

[h1f1add1cted]

iFi Audio I-DSD, samsung galaxy s3, USB Audio player pro.

 
Can you please tell me what cable you are using here? Would this cable do the same job on another Android phone (like the Motorola Moto E) with USB Audio player pro and the iDSD? Thanks

 

[dynacampjim]

h1f1add1cted:

Can you please tell me what cable you are using here? Would this cable do the same job on another Android phone (like the Motorola Moto E) with USB Audio player pro and the iDSD? Thanks 

Hi, I don't know about the cable but I have a Moto E and it will not work with that phone because it does not have OTG.

 

[DanBa]

   
Can you please tell me what cable you are using here? Would this cable do the same job on another Android phone (like the Motorola Moto E) with USB Audio player pro and the iDSD? Thanks

 
It is a micro USB OTG plug-to-standard USB plug cable from Forza AudioWorks:
http://forzaaudioworks.com/en/product.php?id_product=55
 
Apparently, the Moto E doesn't support USB OTG: it cannot switch to USB host mode, able to interwork with a USB peripheral device like the iFi nano IDSD, in accordance with the legacy master-to-slave or USB host-to-USB peripheral communication model.
https://forums.motorola.com/posts/d89af03a15
 
There is a list of USB Audio Player PRO-compatible Android devices (i.e. at least USB host-capable Android devices).
http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/5310#post_10854839

 

[DanBa]

  Details on cables used? 

 
The DragonFly has a standard USB plug, to be usually inserted into a standard USB receptacle of a PC / Mac.
 

 

 
 
An Android smartphone has a micro USB receptacle.
 

 
 
A micro USB plug-to-a standard USB receptacle adapter / cable is required to connect an Android phone with a micro USB receptacle to a DragonFly with a standard USB plug.
 
A special micro USB plug, i.e. micro USB OTG plug, with "pin 4 / ID connected to pin 5 / Ground" (or "ID pin grounded"), when inserted into a micro USB receptacle of a USB OTG-featured Android phone, will switch this phone to USB host mode, able to interwork with a USB peripheral device like the DragonFly, in accordance with the legacy master-to-slave or USB host-to-USB peripheral communication model.
Such a micro USB OTG plug-to-standard USB receptacle adapter or adapter cable is usually called USB OTG adapter or USB OTG adapter cable.
 

 

 

 
 
A list of USB OTG cables:
http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/5310#post_10854839
 
". USB OTG adapter (ID pin grounded)
 
Android device > digital USB audio out >> USB OTG adapter (i.e. micro USB OTG (ID pin grounded) plug to standard USB receptacle) + regular USB cable usually provided by the USB DAC maker (i.e. standard USB plug to standard / mini / micro USB plug cable) >> USB DAC >> amp >> headphones
 
http://bit.ly/JAFjGr
http://bit.ly/JBIJIT
http://amzn.to/1cZsGMN
http://m.dckina.com/mobile.php?main_page=product_info&products_id=1522
..."