[Galaxy Note II Q&A, Help & Troubleshooting] danba:
A list of stock Android-powered devices reportedly interworking with standard USB DAC:

stock Android device > digital USB audio out >> USB OTG cable >> standard USB DAC >> amp >> headphones

. Acer Iconia Tab A200 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/03/15/acer-iconia-tab-a200-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Acer Iconia Tab A500 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2011/04/26/acer-iconia-tab-a500-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Archos G9 (tablet):

http://www.anandtech.com/show/5802/the-archos-g9-tablet-reviews-fast-enough

http://xdaforums.com/showthread.php?t=1539576

. Asus Transformer Pad TF300 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/04/22/asus-transformer-pad-tf300-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Asus Transformer Pad Infinity TF700 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/06/25/asus-transformer-pad-infinity-tf700-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Asus Transformer Prime using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2011/12/01/asus-eee-pad-transformer-prime-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Google Galaxy Nexus using USB Audio Recorder PRO (smartphone):

http://www.theverge.com/products/galaxy-nexus-gsm/2946

http://xdaforums.com/showpost.php?p=35484769&postcount=52

. Google Nexus 7 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/06/28/nexus-7-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Google Nexus 10 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/11/02/nexus-10-review/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1110#post_8973836

. Huawei MediaPad using USB Audio Recorder PRO (tablet):

http://www.androidnz.net/2012/09/rapid-review-huawei-mediapadt-mobile.html

http://www.extreamsd.com/USBAudioRecorderPRO/

. Meizu MX Quad-Core using USB Audio Recorder PRO (smartphone):

http://www.xda-developers.com/android/meizu-mx-quad-core-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Motorola Xoom using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2011/02/23/motorola-xoom-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Samsung Galaxy Note II (smartphone):

http://www.engadget.com/2012/10/08/samsung-galaxy-note-ii-review/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs

. Samsung Galaxy Note 10.1 (tablet):

http://phandroid.com/samsung-galaxy-note-10-1/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/645#post_8814831

. Samsung Galaxy S III (smartphone):

http://www.theverge.com/2012/5/25/3042640/samsung-galaxy-s-iii-review

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs

. Samsung Galaxy Tab 2 7.0 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/04/11/samsung-galaxy-tab-2-7-0-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Samsung Galaxy Tab 2 10.1 using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/05/15/samsung-galaxy-tab-2-10-1-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Sony Xperia S using USB Audio Recorder PRO (smartphone):

http://www.engadget.com/2012/03/08/sony-xperia-s-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

. Sony Xperia Tablet S using USB Audio Recorder PRO (tablet):

http://www.engadget.com/2012/09/24/sony-xperia-tablet-s-review/

http://www.extreamsd.com/USBAudioRecorderPRO/

A list of standard USB DAC reportedly interworking with the Android-powered smartphone Samsung Galaxy Note II:

stock Galaxy Note II > digital USB audio out >> USB OTG cable (micro-A plug inserted in the Note II) >> standard USB DAC >> amp >> headphones

. Apex Glacier (USB DAC/amp):

http://www.head-fi.org/t/632019/apex-glacier-amp-dac-review-and-appreciation-thread

http://www.head-fi.org/t/632019/apex-glacier-amp-dac-review-and-appreciation-thread/165#post_8924724

. Audio-gd NFB-16 (USB DAC/amp):

http://www.audio-gd.com/Pro/Headphoneamp/NFB16/NFB16EN.htm

http://www.head-fi.org/t/625054/samsung-galaxy-note-2/120#post_8943120

. AudioQuest DragonFly using USB Audio Recorder PRO:

http://www.head-fi.org/t/617241/audioquest-dragonfly-review-affordable-outstanding-tiny-dac-amp

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1035#post_8959237

. CEntrance DACport LX using USB Audio Recorder PRO:

http://www.headfonia.com/cheaper-better-the-centrance-dacport-lx/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1065#post_8968468

. FiiO E07K Andes (USB DAC/amp): to be confirmed

http://www.headphiles.org/index.php?t=msg&goto=253249&

http://www.head-fi.org/t/638910/new-fiio-e07k-andes-information-and-impressions/15#post_8924515

http://www.head-fi.org/t/628254/fiio-e18/15#post_8973799

. GoVibe Magnum (USB DAC/amp):

http://www.head-fi.org/t/324577/review-govibe-magnum-usb-dac-amp

http://www.head-fi.org/t/633201/con...xy-s3-international-us-or-note-2#post_8809248

. GoVibe Martini-U (USB DAC/amp):

http://jaben-bandung.com/index.php?route=product/product&product_id=196

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/990#post_8942287

. GoVibe Vulcan (USB DAC/amp):

http://www.head-fi.org/t/386127/go-vibe-vulcan

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/960#post_8929084

. HRT HeadStreamer Mobile (USB DAC/amp):

http://highresolutiontechnologies.com/headstreamer-mobile

http://www.computeraudiophile.com/f...-note-2-while-using-usb-dac-how-please-14029/

. HeadAmp Pico (USB DAC/amp): (via USB 2.0 hub)

http://www.headfonia.com/headamp-pico/

http://www.head-fi.org/t/625054/samsung-galaxy-note-2/30#post_8774905

. Headstage Lyrix Pro USB total (USB DAC/amp):

http://www.headphonia.com/Amps/Headstage-Lyrix-Pro-USB-total::10071.html

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/795#post_8854850

. iBasso D-Zero (USB DAC/amp):

http://www.headfonia.com/fiio-e7-meet-your-rival-the-ibasso-d-zero/

http://www.head-fi.org/t/625054/samsung-galaxy-note-2/120#post_8943120

. iBasso D12 (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=63

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/405#post_8750862

. Leckerton UHA-6S MKII (USB DAC/amp):

http://www.innerfidelity.com/content/leckerton-uha-6s-mkii-portable-headphone-amplifier

http://www.head-fi.org/t/625054/samsung-galaxy-note-2/30#post_8777791

. MyST 1866 PortaDAC (USB DAC/amp):

http://www.musicaacoustics.com/wp/amplifiers/myst-1866/

http://player.ru/showthread.php?t=74459&page=34&p=1084707&viewfull=1#post1084707

. Objective DAC (ODAC):

http://epiphany-acoustics.co.uk/our-products/e-dac-24bit-miniature-usb-dac/

http://www.jdslabs.com/item.php?fetchitem=46

http://www.headnhifi.com/index.php/shop/objective/odac

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/435#post_8758515

. ODAC+O2 (USB DAC/amp):

http://epiphany-acoustics.co.uk/our...ure-desktop-headphone-amplifier-with-usb-dac/

http://www.jdslabs.com/item.php?fetchitem=48

http://www.headnhifi.com/index.php/shop/objective/o2120527192048

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/435#post_8758515

. RSA Intruder (USB DAC/amp):

http://www.innerfidelity.com/conten...ruder-balanced-portable-headphone-amp-and-dac

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/660#post_8819856

. RSA Predator (USB DAC/amp):

http://www.6moons.com/audioreviews/predator/predator_2.html

http://www.head-fi.org/t/625054/samsung-galaxy-note-2/120#post_8960049

. Sony PHA-1 (USB DAC/amp):

http://www.touchmyapps.com/2012/10/09/sony-pha-1-idevice-dac-and-headphone-amp-in-review/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/465#post_8769593

. Stoner Acoustics UD100:

http://www.head-fi.org/t/626632/tiny-dac-big-sound-impression-of-stoner-acoustics-ud100-vs-odac

http://forum.lowyat.net/index.php?showtopic=2449848&st=220&p=56352256&#entry56352256

. VentureCraft Go-Dap X (USB DAC/amp):

http://www.head-fi.org/t/609906/new-venturecraft-go-dap-x-for-both-idevices-and-pcs

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/465#post_8769593

. Zoom H4 using USB Audio Recorder PRO (USB recorder):

http://en.wikipedia.org/wiki/Zoom_H4_Handy_Recorder

http://xdaforums.com/showpost.php?p=35472432&postcount=23

So far, like the quad-core Exynos powered Galaxy S III, the new quad-core Exynos powered Samsung Galaxy Note II can work with the FiiO E7, the iBasso D12, Leckerton UHA-6S MKII, the ODAC, … ; has some issue with the HeadAmp Pico; and doesn’t work with the FiiO E17 using the stock USB audio.

So, in regard to the USB protocol, the behaviour of the Galaxy Note II is likely identical to the behaviour of the Galaxy S III.

A list of standard USB DAC reportedly interworking with the Android-powered smartphone Samsung Galaxy S III:

stock Samsung Galaxy S III > digital USB audio out >> USB OTG cable (micro-A plug inserted in the S III) >> standard USB DAC >> amp >> headphones

. AMB Gamma 1:

http://www.amb.org/audio/gamma1/

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/780#post_8750043

. AMB Gamma 2:

http://www.amb.org/audio/gamma2/

http://xdaforums.com/showpost.php?p=27247705&postcount=279

. Apex Glacier (USB DAC/amp):

http://www.ttvjaudio.com/Apex_High_Fi_Audio_Glacier_portable_headphone_amp_p/aaa0000010.htm

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/825#post_8776449

. Asus Xonar U3 (USB DAC/amp):

http://www.asus.com/Multimedia/Audio_Cards/Xonar_U3/

http://mybroadband.co.za/vb/showthread.php/429589-Samsung-Galaxy-S3?p=8551119&viewfull=1#post8551119

. Atoll DAC 100:

http://www.6moons.com/audioreviews/atoll2/atoll.html

http://xdaforums.com/showpost.php?p=35266076&postcount=17

. Audio-gd Sparrow Version A (USB DAC/amp):

http://www.audio-gd.com/Pro/Headphoneamp/Sparrow/SparrowEN.htm

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/915#post_8907415

. Behringer UCA202 (USB DAC/amp):

http://www.behringer.com/EN/Products/UCA202.aspx

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/240#post_8654226

. Behringer UCA222 (USB DAC/amp):

http://www.behringer.com/en/Products/UCA222.aspx

http://www.computeraudiophile.com/f...owered-samsung-galaxy-s-iii-12338/#post171651

. Beresford Caiman:

http://www.techradar.com/reviews/au...fi-accessories/beresford-caiman-673787/review

http://www.computeraudiophile.com/f...owered-samsung-galaxy-s-iii-12338/#post171651

. C-Media chipset-based sound card Dynamode 7 channel USB 2.0 (USB DAC/amp):

http://www.chinacomputerparts.com/d-p1140199199635616900-cables/

http://xdaforums.com/showpost.php?p=27604946&postcount=449

. Cakewalk Sonar SPS 25:

https://www.cakewalk.com/support/kb/reader.aspx/2007013101

http://www.computeraudiophile.com/f...owered-samsung-galaxy-s-iii-12338/#post171651

. Cambridge Audio DacMagic:

http://www.headfonia.com/cambridge-dacmagic-review/

http://www.head-fi.org/t/631855/galaxy-s3-and-ca-dacmagic-plus#post_8899779

. Corsair HS1 Gaming headset (USB DAC/amp/headphones):

http://www.anandtech.com/show/3989/corsair-hs1-gaming-headset

http://xdaforums.com/showthread.php?p=27238117#post27238117

. Dared MP 5 or ALO JV5 (USB DAC/amp):

http://www.positive-feedback.com/Issue24/dared_mp5.htm

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/990#post_8948190

. FiiO E7 (USB DAC/amp):

http://www.headfonia.com/fiio-e7-portable-dac/

http://www.androidnz.net/2012/07/galaxy-s-iii-real-user-review-part-2.html

. FiiO E07K Andes (USB DAC/amp): to be confirmed

http://headfonics.com/2012/12/fiio-e07k-the-andes/

http://www.head-fi.org/t/638910/new-fiio-e07k-andes-information-and-impressions/15#post_8924515

http://www.head-fi.org/t/628254/fiio-e18/15#post_8973799

. FiiO E17 (USB DAC/amp) using USB Audio Recorder PRO:

http://www.headfonia.com/the-upgrade-fiio-e17-alpen/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1020#post_8958018

. Furutech ADL Cruise (USB DAC/amp):

http://www.furutech.com/a2008/product2.asp?prodNo=399

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/585#post_8567838

. GoVibe DAC:

http://jaben.net/forums/index.php?topic=2824.0

http://forum.lowyat.net/index.php?showtopic=2440879&st=500&p=53317360&#entry53317360

. GoVibe Mini USB DAC:

http://www.jaben.com.au/collections/go-vibe/products/govibe-minidac

http://www.head-fi.org/t/614111/finally-digital-out-for-galaxy-siii/15#post_8525675

. GoVibe Petite (USB DAC/amp):

http://www.head-fi.org/t/290711/govibe-petite-dac-amp-appreciation-thread-pics-little-update

http://www.head-fi.org/t/595071/and...-issues-priority-with-google/195#post_8552452

. HRT HeadStreamer (USB DAC/amp):

http://www.headfonia.com/hrt-headstreamer-review/

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/750#post_8677483

. HRT Music Streamer II:

http://highresolutiontechnologies.com/music-streamer-ii

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/465#post_8534856

. HeadAmp Pico (USB DAC/amp): (Exynos-based S III connected to Pico via USB 2.0 hub)

http://www.headamp.com/pico/pico_dac_amp/index.htm

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/480#post_8539705

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/750#post_8688938

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/720#post_8638606

. HeadRoom Total BitHead (USB DAC/amp):

http://www.headphone.com/learning-center/bithead-faq.php

http://www.head-fi.org/t/595071/and...-issues-priority-with-google/135#post_8527516

. HeadStage USB DAC cable:

http://www.inearmatters.net/2010/04/short-review-headstage-usb-dac-cable.html

http://www.headphiles.org/index.php/topic,4452.msg241979.html#msg241979

. HiFiMan Express HM-101:

http://www.head-fi.org/t/571330/hifiman-express-brand-and-hm-101-portable-usb-dac

http://xdaforums.com/showpost.php?p=27284184&postcount=291

. iBasso D-Zero (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=73

http://neutronmp.com/forum/viewtopic.php?f=4&t=314&start=20#p1636

. iBasso D2 Boa (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=30

http://www.head-fi.org/t/552014/pictures-of-your-portable-rig-part-xv/5535#post_8509186

. iBasso D2+ Boa (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=42

http://www.computeraudiophile.com/f...owered-samsung-galaxy-s-iii-12338/#post171651

. iBasso D5 (USB DAC/amp):

http://www.head-fi.org/t/556490/ibasso-d5-hj-yet-another-usb-dac-amp

http://www.head-fi.org/t/614111/finally-digital-out-for-galaxy-siii#post_8462693

. iBasso D6 using USB Audio Recorder PRO (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=69

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1170#post_8980613

. iBasso D10 (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=39

http://www.head-fi.org/t/628374/sam...-usb-micro-b-male-to-mini-b-male#post_8735134

. iBasso D12 (USB DAC/amp):

http://www.ibasso.com/en/products/show.asp?ID=63

http://xdaforums.com/showpost.php?p=29069294&postcount=924

. iBasso DB2 using USB Audio Recorder PRO:

http://www.ibasso.com/en/products/show.asp?ID=71

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1035#post_8959039

. iQube v2 (USB DAC/amp):

http://www.i-qube.nl/index.php?id=24

http://xdaforums.com/showpost.php?p=31207282&postcount=1268

. JH Audio JH-3A (USB DSP/DAC/amp/JH16 CIEM):

http://www.jhaudio.com/product/jh-3a-dsp-amp-jh16-pro-custom-ear-monitor

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/585#post_8799910

. Jabra GN 5035 (USB headset):

http://reviews.cnet.com/headsets/jabra-gn5035-headset/4505-13831_7-32462996.html

http://xdaforums.com/showpost.php?p=33203364&postcount=1368

. KingRex UD-01:

http://www.kingrex.co.uk/dac.html

https://www.facebook.com/headfonia/posts/352787358128700

. Leckerton UHA-4 (USB DAC/amp):

http://www.leckertonaudio.com/products/uha-4/

http://www.head-fi.org/t/536982/leckerton-audio-slimline-uha-4/1020#post_8773152

. Leckerton UHA-6S MKII (USB DAC/amp):

http://www.leckertonaudio.com/products/uha-6s-mkii/

http://www.head-fi.org/t/602493/new...essions-added-july-20th-2012/435#post_8698006

. M-Audio Duo USB Audio Interface:

http://www.soundonsound.com/sos/oct02/articles/maudio.asp

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/540#post_8788814

. Matrix Mini-i (USB DAC/amp):

http://www.headfonia.com/matrix-mini-i-balanced-dac/

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/465#post_8768166

. Meier Audio Cantate.2 (USB DAC/amp):

http://www.head-fi.org/products/meier-audio-corda-cantate-2

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/660#post_8820899

. Microsoft Philips Digital Sound System 80 (USB DAC/amp/speakers):

http://en.wikipedia.org/wiki/Digital_Sound_System_80

http://xdaforums.com/showthread.php?t=1703218

. Microsoft LifeChat LX-3000 (USB headset):

http://www.microsoft.com/hardware/en-au/p/lifechat-lx-3000/JUG-00003

http://xdaforums.com/showpost.php?p=32899845&postcount=1355

. MyST 1866 PortaDAC (USB DAC/amp):

http://www.head-fi.org/t/616889/mys...xial-usb-dac-headphone-amp-impressions-thread

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/795#post_8852573

. NuForce Icon HDP (USB DAC/amp):

http://www.nuforce.com/hp/products/iconhdp/index.php

http://www.head-fi.org/t/608535/wolfson-dac-confirmed-for-galaxy-s3/585#post_8567838

. NuForce Icon Mobile (USB DAC/amp):

http://www.6moons.com/audioreviews/nuforce10/mobile.html

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/435#post_8759826

. NuForce Icon uDAC-2 (USB DAC/amp):

http://www.digitaltrends.com/headphone-amplifier-reviews/nuforce-icon-udac-2-review/

http://xdaforums.com/showpost.php?p=35266076&postcount=17

. Objective DAC (ODAC):

http://epiphany-acoustics.co.uk/our-products/e-dac-24bit-miniature-usb-dac/

http://www.jdslabs.com/item.php?fetchitem=46

http://www.headnhifi.com/index.php/shop/objective/odac

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/315#post_8707637

. ODAC+O2 (USB DAC/amp):

http://epiphany-acoustics.co.uk/our...ure-desktop-headphone-amplifier-with-usb-dac/

http://www.jdslabs.com/item.php?fetchitem=48

http://www.headnhifi.com/index.php/shop/objective/o2120527192048

http://www.facebook.com/permalink.php?story_fbid=410941392302962&id=164588276945555

. Ordnance .25 (USB DAC/amp):

http://jaben.net/forums/index.php?topic=9984.0

http://www.head-fi.org/t/614111/finally-digital-out-for-galaxy-siii#post_8462693

. RSA Intruder (USB DAC/amp):

http://www.raysamuelsaudio.com/products/intruder

http://www.head-fi.org/t/627080/new-balanced-portable-amp-from-rsa-w-dac/30#post_8781567

. RSA Predator (USB DAC/amp):

http://www.raysamuelsaudio.com/products/predator

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/150#post_8538933

. Stoner Acoustics UD100:

http://stoneracoustics.blogspot.fr/

http://forum.lowyat.net/index.php?showtopic=2452730&st=160&p=54596977&#entry54596977

. Syba SD-AUD20101:

http://www.sybausa.com/productInfo.php?iid=1191

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/375#post_8736082

. Topping D1 Mark 2 (USB DAC/amp):

http://www.head-fi.org/t/636606/topping-d1-mark-2-review

http://xdaforums.com/showpost.php?p=28673076&postcount=871

. Topping D2 (USB DAC/amp):

http://www.mightybigword.com/tnt/2012/03/topping-d2-dac-review/

http://xdaforums.com/showpost.php?p=32920194&postcount=1357

. Topping TP30 (USB DAC/amp):

http://news.cnet.com/8300-5_3-0.html?keyword=Topping+TP-30

http://www.androidnz.net/2012/05/samsung-galaxy-s-iii-usb-audio.html

. Turtle Beach Audio Advantage Micro II:

http://linkai8424.blogspot.fr/2011/03/turtle-beach-audio-advantage-micro-ii.html

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1155#post_8978516

. Unique Melody PP6 (USB DSP/DAC/amp/CIEM) using USB Audio Recorder PRO:

http://www.theheadphonecompany.co.u...lody-unique-melody-platform-pure-6-um-pp6.php

http://www.head-fi.org/t/613417/uni...ion-appreciation-tour-thread/360#post_8965862

. VentureCraft Go-Dap X (USB DAC/amp):

http://venturecraft.jp/gadget_en/gdx.php

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/315#post_8708233

. xDuoo XP-1 (USB DAC/amp):

http://www.xduoo.com/xduoo/ProductShow.asp?ID=47

http://www.erji.net/read.php?tid=1320392&fpage=0&toread=&page=1