Lowyat.NET: Latest topics by DanBa

Lowyat.NET: Latest topics by DanBa http://forum.lowyat.net/ Sun, 28 Jun 2026 17:00:05 +0800 FeedCreator 1.7.2 Enable USB audio on any Android 4.X device http://forum.lowyat.net/topic/2222840 If you want the USB audio enabled on any Android 4.X device via official firmware/kernel, please vote (aka star) here:<br /><a href='http://code.google.com/p/android/issues/detail?id=24614&sort=-stars&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars' target='_blank'>http://code.google.com/p/android/issues/de...Summary%20Stars</a><br /><br />Star: Vote by clicking on the star<br /><br /><br /><br />According to Android specifications, Android 4.X devices could support the USB audio feature, i.e. Android 4.X devices and USB_CLASS_AUDIO compliant devices like standard USB DAC could interoperate:<br /><a href='http://developer.android.com/guide/topics/usb/index.html' target='_blank'>http://developer.android.com/guide/topics/usb/index.html</a><br /><a href='http://developer.android.com/reference/android/hardware/usb/UsbConstants.html' target='_blank'>http://developer.android.com/reference/and...bConstants.html</a><br /><br />USB_CLASS_AUDIO compliant devices like standard USB DAC don’t need a special USB device driver. Instead, they use an operating system standard driver. <br />The Android standard USB audio driver is the generic USB Audio Driver for ALSA (Advanced Linux Sound Architecture).<br />And the latest Android 4.X includes “card.c“, the USB Audio Driver for ALSA which should be compliant with USB audio class 2 devices allowing for 24 bits / 192 kHz.<br /><a href='https://bitbucket.org/paulobrien/android_kernel_galaxynexus/src/bc4f9b72a51d/sound/usb/card.c' target='_blank'>https://bitbucket.org/paulobrien/android_ke...ound/usb/card.c</a><br /><br /><img src='http://farm6.static.flickr.com/5253/5534201226_7e7d2d90eb_b.jpg' border='0' alt='user posted image' /><br /><br />Android relies on Linux version 2.6 for core system services such as security, memory management, process management, network stack, and driver model. The Linux kernel also acts as an abstraction layer between the hardware and the rest of the software stack.<br />Thus Android handles all the things that Linux is really good at such as a vast array of device drivers, which take the pain out of interfacing to peripheral hardware.<br /><br /><br />Most USB DAC work without special USB device driver on PC, Mac and hopefully Android 4.X devices with USB audio enabled.<br /><br />Some USB DAC:<br /><br />. Portable FiiO USB DAC/amp: <br /><a href='http://www.fiio.com.cn/product/' target='_blank'>http://www.fiio.com.cn/product/</a><br /><br />. Portable iBasso USB DAC/amp: <br /><a href='http://www.ibasso.com/en/products/' target='_blank'>http://www.ibasso.com/en/products/</a><br /><br />. Portable RSA USB DAC/amp:<br /><a href='http://www.raysamuelsaudio.com/products/predator' target='_blank'>http://www.raysamuelsaudio.com/products/predator</a><br /><br />. Portable HeadAmp USB DAC/amp:<br /><a href='http://www.headamp.com/pico/pico_dac_amp/index.htm' target='_blank'>http://www.headamp.com/pico/pico_dac_amp/index.htm</a><br /><br />. Portable GoVibe USB DAC/amp:<br /><a href='http://jaben.net/shopping2/Porta-Tube_Plus.html' target='_blank'>http://jaben.net/shopping2/Porta-Tube_Plus.html</a><br /><br />. Desktop CEntrance USB DAC/amp:<br /><a href='http://centrance.com/products/' target='_blank'>http://centrance.com/products/</a><br /><br />. Desktop USB DAC MSB DAC IV:<br /><a href='http://www.msbtech.com/products/platinumHome.php' target='_blank'>http://www.msbtech.com/products/platinumHome.php</a><br /><br />....<br /><br /><br /><br />About external USB DAC/Amp<br /><br />A digital audio system is composed of:<br /> <br /><img src='http://www.head-fi.org/content/type/61/id/685142/width/500/height/1000/flags/LL.jpg' border='0' alt='user posted image' /><br /> <br />. A storage module: Music is stored in file as a series of bits 0 & 1 with different encoding formats (MP3, WAV, FLAC…).<br />. A player: The player decodes the bits 0 & 1 to PCM digital audio signals.<br />. A DAC (Digital to Analog Converter): The DAC converts the PCM digital audio signals to the original analog audio signals.<br />. An amplifier: The amplifier amplifies the analog audio signals.<br />. A speaker: The speaker restitutes the music.<br /> <br /> <br />Like a PC or a Mac, an Android phone is a digital audio system.<br /> <br /><img src='http://www.head-fi.org/content/type/61/id/685143/width/500/height/1000/flags/LL.jpg' border='0' alt='user posted image' /><br /> <br /> <br />Hopefully, the Android phone, running on a kernel with a USB audio driver, can output the PCM digital audio stream to an external standard USB DAC & amplifier & headphone, much more efficient than the internal DAC & amplifier & speakerphone.<br /> <br /><img src='http://www.head-fi.org/content/type/61/id/685144/width/500/height/1000/flags/LL.jpg' border='0' alt='user posted image' /><br /><br /><br /><br /><br />A list of stock Android-powered devices reportedly interworking with standard USB DAC:<br /><br />stock Android device > digital USB audio out >> standard USB DAC >> amp >> headphones<br /><br />. Acer Iconia Tab A200 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/03/15/acer-iconia-tab-a200-review/' target='_blank'>http://www.engadget.com/2012/03/15/acer-ic...ab-a200-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Acer Iconia Tab A500 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2011/04/26/acer-iconia-tab-a500-review/' target='_blank'>http://www.engadget.com/2011/04/26/acer-ic...ab-a500-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Archos G9 (tablet):<br /><a href='http://www.anandtech.com/show/5802/the-archos-g9-tablet-reviews-fast-enough' target='_blank'>http://www.anandtech.com/show/5802/the-arc...ews-fast-enough</a><br /><a href='http://forum.xda-developers.com/showthread.php?t=1539576' target='_blank'>http://forum.xda-developers.com/showthread.php?t=1539576</a><br /><br />. Asus TF101 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2011/04/18/asus-eee-pad-transformer-uk-edition-review/' target='_blank'>http://www.engadget.com/2011/04/18/asus-ee...edition-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Asus TF201 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.tomshardware.com/reviews/transformer-prime-tf201-tablet-review,3175.html' target='_blank'>http://www.tomshardware.com/reviews/transf...eview,3175.html</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Asus TF300 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/04/22/asus-transformer-pad-tf300-review/' target='_blank'>http://www.engadget.com/2012/04/22/asus-tr...d-tf300-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Asus TF700 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/06/25/asus-transformer-pad-infinity-tf700-review/' target='_blank'>http://www.engadget.com/2012/06/25/asus-tr...y-tf700-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Asus Transformer Prime using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2011/12/01/asus-eee-pad-transformer-prime-review/' target='_blank'>http://www.engadget.com/2011/12/01/asus-ee...r-prime-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Google Galaxy Nexus using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.theverge.com/products/galaxy-nexus-gsm/2946' target='_blank'>http://www.theverge.com/products/galaxy-nexus-gsm/2946</a><br /><a href='http://forum.xda-developers.com/showpost.php?p=35484769&postcount=52' target='_blank'>http://forum.xda-developers.com/showpost.p...69&postcount=52</a><br /><br />. Google Nexus 7 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/06/28/nexus-7-review/' target='_blank'>http://www.engadget.com/2012/06/28/nexus-7-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Google Nexus 10 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/11/02/nexus-10-review/' target='_blank'>http://www.engadget.com/2012/11/02/nexus-10-review/</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1110#post_8973836' target='_blank'>http://www.head-fi.org/t/595071/android-ph...10#post_8973836</a><br /><br />. HTC Butterfly / HTC Droid DNA / HTC J Butterfly (smartphone):<br /><a href='http://www.htc.com/www/smartphones/htc-butterfly/' target='_blank'>http://www.htc.com/www/smartphones/htc-butterfly/</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1425#post_9082851' target='_blank'>http://www.head-fi.org/t/595071/android-ph...25#post_9082851</a><br /><br />. HTC One X (smartphone):<br /><a href='http://www.engadget.com/2012/04/02/htc-one-x-review/' target='_blank'>http://www.engadget.com/2012/04/02/htc-one-x-review/</a><br /><a href='http://forum.lowyat.net/index.php?showtopic=2222840&st=60&p=57944246&#entry57944246' target='_blank'>http://forum.lowyat.net/index.php?showtopi...&#entry57944246</a><br /><br />. Huawei Ascend D1 Quad XL using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.engadget.com/2012/10/20/huawei-ascend-d1-quad-xl-review/' target='_blank'>http://www.engadget.com/2012/10/20/huawei-...quad-xl-review/</a><br /><a href='http://www.head-fi.org/t/628254/fiio-e18/15#post_8988466' target='_blank'>http://www.head-fi.org/t/628254/fiio-e18/15#post_8988466</a><br /><br />. Huawei MediaPad using USB Audio Recorder PRO (tablet):<br /><a href='http://www.androidnz.net/2012/09/rapid-review-huawei-mediapadt-mobile.html' target='_blank'>http://www.androidnz.net/2012/09/rapid-rev...adt-mobile.html</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. iMito MX1 (mini PC):<br /><a href='http://www.squidoo.com/imito-mx1-android-mini-pc-bluetooth' target='_blank'>http://www.squidoo.com/imito-mx1-android-mini-pc-bluetooth</a><br /><a href='http://www.armtvtech.com/armtvtechforum/viewtopic.php?f=81&t=669&start=10' target='_blank'>http://www.armtvtech.com/armtvtechforum/vi...&t=669&start=10</a><br /><br />. MK808 / MK808B (mini PC):<br /><a href='http://www.squidoo.com/mk808-dual-core-android-mini-pc-review' target='_blank'>http://www.squidoo.com/mk808-dual-core-and...-mini-pc-review</a><br /><a href='http://tabletrepublic.com/forum/android-mini-pc/uhost2-mk808-supports-audio-usb-dongle-3092.html' target='_blank'>http://tabletrepublic.com/forum/android-mi...ongle-3092.html</a><br /><br />. Meizu MX Quad-Core using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.xda-developers.com/android/meizu-mx-quad-core-review/' target='_blank'>http://www.xda-developers.com/android/meiz...ad-core-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Minix Neo G4 (mini PC):<br /><a href='http://www.squidoo.com/minix-neo-g4-review' target='_blank'>http://www.squidoo.com/minix-neo-g4-review</a><br /><a href='http://www.facebook.com/minixtech/posts/466648763397297' target='_blank'>http://www.facebook.com/minixtech/posts/466648763397297</a><br /><br />. Minix Neo X5 (mini PC):<br /><a href='http://tabletrepublic.com/forum/android-mini-pc/minix-neo-x5-google-tv-box-16gb-android-4-1-bluetooth-review-3241.html' target='_blank'>http://tabletrepublic.com/forum/android-mi...eview-3241.html</a><br /><a href='http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1358382120&openflup&5&4' target='_blank'>http://forum.audiogon.com/cgi-bin/fr.pl?dd...20&openflup&5&4</a><br /><br />. Motorola Razr Maxx HD using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.engadget.com/2012/10/19/droid-razr-hd-and-razr-maxx-hd-review/' target='_blank'>http://www.engadget.com/2012/10/19/droid-r...maxx-hd-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Motorola Xoom using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2011/02/23/motorola-xoom-review/' target='_blank'>http://www.engadget.com/2011/02/23/motorola-xoom-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Samsung Galaxy Camera (camera):<br /><a href='http://www.digitaltrends.com/digital-camera-reviews/samsung-galaxy-camera-ek-gc100-review/' target='_blank'>http://www.digitaltrends.com/digital-camer...k-gc100-review/</a><br /><a href='http://www.sogi.com.tw/android/article_list.aspx?OsId=1&topic_ID=6205384' target='_blank'>http://www.sogi.com.tw/android/article_lis...opic_ID=6205384</a><br /><br />. Samsung Galaxy Note II (smartphone):<br /><a href='http://www.engadget.com/2012/10/08/samsung-galaxy-note-ii-review/' target='_blank'>http://www.engadget.com/2012/10/08/samsung...note-ii-review/</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs' target='_blank'>http://www.head-fi.org/t/595071/android-phones-and-usb-dacs</a><br /><br />. Samsung Galaxy Note 10.1 (tablet):<br /><a href='http://phandroid.com/samsung-galaxy-note-10-1/' target='_blank'>http://phandroid.com/samsung-galaxy-note-10-1/</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/645#post_8814831' target='_blank'>http://www.head-fi.org/t/595071/android-ph...45#post_8814831</a><br /><br />. Samsung Galaxy R using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.engadget.com/2011/08/10/samsung-galaxy-r-officially-announced-for-europe-and-asia-nobod/' target='_blank'>http://www.engadget.com/2011/08/10/samsung...and-asia-nobod/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Samsung Galaxy S III (smartphone):<br /><a href='http://www.theverge.com/2012/5/25/3042640/samsung-galaxy-s-iii-review' target='_blank'>http://www.theverge.com/2012/5/25/3042640/...xy-s-iii-review</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs' target='_blank'>http://www.head-fi.org/t/595071/android-phones-and-usb-dacs</a><br /><br />. Samsung Galaxy Tab 2 7.0 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/04/11/samsung-galaxy-tab-2-7-0-review/' target='_blank'>http://www.engadget.com/2012/04/11/samsung...b-2-7-0-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Samsung Galaxy Tab 7.7 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/02/07/samsung-galaxy-tab-7-7-review-international-edition/' target='_blank'>http://www.engadget.com/2012/02/07/samsung...tional-edition/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Samsung Galaxy Tab 10.1 using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2012/05/15/samsung-galaxy-tab-2-10-1-review/' target='_blank'>http://www.engadget.com/2012/05/15/samsung...-2-10-1-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Sony Tablet S / S1 using USB Audio Recorder PRO (tablet):<br /><a href='http://en.wikipedia.org/wiki/Sony_Tablet_S1' target='_blank'>http://en.wikipedia.org/wiki/Sony_Tablet_S1</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1725#post_9176002' target='_blank'>http://www.head-fi.org/t/595071/android-ph...25#post_9176002</a><br /><br />. Sony Xperia P using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.engadget.com/2012/06/03/sony-xperia-p-review/' target='_blank'>http://www.engadget.com/2012/06/03/sony-xperia-p-review/</a><br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1635#post_9131701' target='_blank'>http://www.head-fi.org/t/595071/android-ph...35#post_9131701</a><br /><br />. Sony Xperia S using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.engadget.com/2012/03/08/sony-xperia-s-review/' target='_blank'>http://www.engadget.com/2012/03/08/sony-xperia-s-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Sony Xperia Sola using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.androidcentral.com/device/sony-xperia-sola' target='_blank'>http://www.androidcentral.com/device/sony-xperia-sola</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Sony Xperia Z (smartphone):<br /><a href='http://www.engadget.com/2013/02/20/sony-xperia-z-review/' target='_blank'>http://www.engadget.com/2013/02/20/sony-xperia-z-review/</a><br /><a href='http://www.youtube.com/watch?v=kgNkOs9o1dU' target='_blank'>http://www.youtube.com/watch?v=kgNkOs9o1dU</a><br /><br />. Toshiba Thrive using USB Audio Recorder PRO (tablet):<br /><a href='http://www.engadget.com/2011/07/22/toshiba-thrive-review/' target='_blank'>http://www.engadget.com/2011/07/22/toshiba-thrive-review/</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br />. Wiko Cink King using USB Audio Recorder PRO (smartphone):<br /><a href='http://www.wikomobile.com/telephone-portable-Cink-king.php' target='_blank'>http://www.wikomobile.com/telephone-portable-Cink-king.php</a><br /><a href='http://www.extreamsd.com/USBAudioRecorderPRO/' target='_blank'>http://www.extreamsd.com/USBAudioRecorderPRO/</a><br /><br /><br /><img src='http://www.avsforum.com/content/type/61/id/154043/width/500/height/1000/flags/LL.jpg' border='0' alt='user posted image' /><br /><br /><br /><br />The compatibility list of Android devices / USB DAC is regularly updated at the following topic:<br /><a href='http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/1785#post_9215106' target='_blank'>Android phones and USB DACs</a><br /><br />We should put pressure on Google, and therefore on the Android device manufacturers.<br /><br />USB audio is included in Android 3.1 or newer platforms.<br /><a href='http://developer.android.com/guide/topics/usb/index.html' target='_blank'>http://developer.android.com/guide/topics/usb/index.html</a><br /><br />It is up to Google for its reference Nexus and the other Android device manufacturers to support or enable the USB audio feature on their devices.<br /><br />An example: <br />Interworking between Archos G9 tablet and USB DAC FiiO E17:<br /><a href='http://www.jbmm.fr/2012/01/utiliser-le-dac-fiio-e17-avec-son-archos/' target='_blank'>http://www.jbmm.fr/2012/01/utiliser-le-dac...vec-son-archos/</a><br /><br /><br /><img src='http://cdn.head-fi.org/b/bd/350x263px-LL-bd7270ff_FIIOE17_15.jpeg' border='0' alt='user posted image' /><br /><br /><br />The Archos G9 tablet is powered by Android 3.2 Honeycomb.<br /><a href='http://www.archos.com/products/gen9/archos_101g9/index.html?country=us&lang=en' target='_blank'>http://www.archos.com/products/gen9/archos...ntry=us&lang=en</a><br /><a href='http://update.archos.com/9/gen9/changes_firmware_archos_android_gen9.htm' target='_blank'>http://update.archos.com/9/gen9/changes_fi...ndroid_gen9.htm</a><br /><br />Version 3.2.22 - September 2nd, 2011: USB audio not supported<br />Initial Honeycomb 3.2 firmware release<br /><br />Version 3.2.77 - December 6th, 2011<br />Accessories: external USB audio cards (DAC) support has been added<br /><br />Version 3.2.78 - December 19th, 2011<br />Audio accessory: fix USB DAC not supporting 44.1kHz<br /><br />[addedon]February 11, 2012, 11:01 pm[/addedon]The official Android with USB audio enabled should be used by most people, who don’t want to mod their devices.<br /><br />A die-hard audiophile minority should likely use audio-optimized Android kernels modded by some kernel modders.<br /><br />"An interesting example is the HRT music streamer II, it IS asynchronous USB, but it is still very sensitive to what happens in the computer. On the SAME COMPUTER I can make simple changes to OS scheduling parameters and get a huge difference in the sound. At one end of the scale it’s dull, lifeless, no depth at all, at the other end of the scale it is wonderfully alive, dynamic, huge depth etc. And all this by just changing a few numbers, NO change in hardware at all." <br /><a href='http://www.audioasylum.com/cgi/m.pl?forum=pcaudio&n=101397' target='_blank'>http://www.audioasylum.com/cgi/m.pl?forum=pcaudio&n=101397</a><br /><br />For example, an underclocked kernel should be better than a normal kernel to provide a lesser jittered digital audio stream to a USB DAC, because the USB transmission clock is less polluted by electric and electromagnetic interferences generated by different processors.<br /><br />Anyway, Android kernel modders have already enabled the USB audio feature on Nook Color tablets which are powered by Android 2.3 Gingerbread.<br /><a href='http://forum.xda-developers.com/showpost.php?p=16229673&postcount=587' target='_blank'>http://forum.xda-developers.com/showpost.p...3&postcount=587</a><br /><br />[addedon]February 13, 2012, 11:25 pm[/addedon]Thank you for your votes!<br /><br />The USB audio request is currently ranked 50, and there are 17550 requests.<br /><a href='http://code.google.com/p/android/issues/detail?id=24614&sort=-stars&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars' target='_blank'>http://code.google.com/p/android/issues/de...Summary%20Stars</a><br /><br />In fact, it is ranked in top 10 of less than one year old requests.<br /><br />An Android kernel developer is trying to enable the USB audio feature (i.e. to allow interoperability between Samsung Galaxy S2 and USB DAC).<br />He is looking for testers.<br /><br />"Anyone have a dmesg log when connecting a DAC device? I don't use one so I can't test and get logs. If you need DAC support you'll need to help out here. If not, I can simply remove support for it in 1.4 since it doesn't work right and I can't test it."<br /><a href='http://forum.xda-developers.com/showpost.php?p=22706440&postcount=10082' target='_blank'>http://forum.xda-developers.com/showpost.p...postcount=10082</a><br /><br />Red Pill Kernel<br />RedPill_Rev1.3<br />Experimental: USB Audio support for DAC devices<br /><a href='http://forum.xda-developers.com/showthread.php?t=1288850' target='_blank'>http://forum.xda-developers.com/showthread.php?t=1288850</a><br /><br /><br /><br />The official USB audio request is currently ranked 33 of 17817.<br /><a href='http://code.google.com/p/android/issues/detail?id=24614&sort=-stars&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars' target='_blank'>http://code.google.com/p/android/issues/de...Summary%20Stars</a><br /><br />In fact, it is ranked in top 4 of less than one year old requests.<br /><br />Vote: Click on the star<br /><br />Thank you for your votes!<br /><br />Why not a battery-powered USB hub? DanBa Audiophiles Sat, 11 Feb 2012 20:50:03 +0800