[Android Head-Units] kampfschachtel:
Hi all,

I created this thread as a common one for all topics related to audio as the Joying Sofia Units are in the frist place car audio equipment and 2nd a android tablet with an analog amp and switchboard.

There are already a selection of threads out in the forum but they are very hard to find and I will volunteer to do the same as user gusten and make a summary here in this first post as tips&tricks regarding all audio topics in this thread so you have an overview.

Users please respect this is audio related topics ONLY so we don't get a mess. Thank you.

Major topics here are:

- all sound out via USB out to use a external DAC to get the joying to a total new sound quality level

How to get a USB sound out (big thank you to https://xdaforums.com/member.php?u=503463 for this):

"mod all audio out via USB out"

to get USB sound out and the DACs below working you need to perform this mod

https://xdaforums.com/showpost.php?p=71532787&postcount=201 and https://xdaforums.com/showpost.php?p=71536897&postcount=215 and https://xdaforums.com/showpost.php?p=71539324&postcount=216

file to download: https://xdaforums.com/attachment.php?attachmentid=4084494&d=1490188105:

Ok, attached is the audio_policy.conf file zipped. So just unzip the file, and replace the original file located at /system/etc/audio_policy.conf with the one in the zip. You can do this via adb or root file manager. The joying need to be rooted before for this mod. Also, make sure the permissions on the file are 0644.

Discussion about USB-DAC setup is here: https://xdaforums.com/android-auto/android-head-units/android-5-1-head-unit-usb-audio-dac-t3426604

to test if a DAC is recognised or not you don't need to mod/root your joying:

how to test your USB DAC:

1) download the neutron player: https://play.google.com/store/apps/details?id=com.neutroncode.mpeval

2) connect your USB dac with USB to the joying and put any headphone as output or RCA out to any amp you have avaliable.

3) start the neutron player

4) let neutron search your libary automatically

5) play any track that neutron shows (eg the navi Mp3)

=> if you get sound on your headphones/amp, the joying is recognising your DAC. If the DAC has volume buttons, test them to see if volume control works.

=> if no, the joying doesn't recognise it. Send it back.

- list of USB DACs that work, partly work with workaround to make it work and which DACs don't.

All DACs working with Andoid 5 will also work with Android 6 as the generic drivers build in are the same and some additional drivers added. But some DACs that don't work with Android 5 will maybe work with 6, so please try them and give feedback please.

working USB DACs:

all need the" USB out with volume control" mod

Helix Pro MK2 with the USB module works also with just the USB out without volume control as it has its own master volume

Behringer UAC202 which has a DAC Chip TI/Burr Brown PCM2902 => http://nwavguy.blogspot.ch/2011/02/behringer-uca202-review.html

all DACs based on the DAC Chip from TI/Burr Brown PCM 2704 => has better Specs then the PCM 2902

http://www.ebay.com/itm/PCM2704-USB...Card-Decoder-Board-Aluminum-case/171822774894 (kampfschachtel)

https://www.amazon.de/PCM2704-Soundkarte-Glasfaser-Koaxial-Ausgang/dp/B016CZ2NK6

Muse: http://www.thanksbuyer.com/muse-min...l-decoder-usb-to-s-pdif-converter-black-24562

partly working USB DACs:

ASUS Xonar U3 Exellent sound , but not able to control volume from Head Unit

not working USB DACs

to understand the topic Android and USB audio better, this is a great article:

http://apcmag.com/the-ins-and-outs-of-android-usb-audio.htm/

- hardware mods regarding sound (e.g. TDA amp replacement with Pioneer Amp)

replacing TDA 7380 (4x30W) with Pioneer PA2030A (4x60W) much better sound&bass or TDA7850 (4x50W 4ohm or 4x85W 2Ohm): http://forum.carjoying.com/thread-4...ar-view-camera-problem-changing-tda-7388.html

Adb to Wifi app (turn on and off adb on the joying, eg. restart the ADB server which sometimes stops working after reboot)

https://xdaforums.com/showpost.php?p=71616884&postcount=273

- l[B Viper4Joying mod [/B] a must have for every sofia joying out there,results in a much better sound and provides a 11 channel EQ. (need to be rooted for this mod)

for Android 5.1.1

Viper4android and compatible busybox: how to install, modified version for the joying Sofia Intel: https://xdaforums.com/showpost.php?p=72123641&postcount=134

You need to install the busybox from this link too, the busybox version provided by surfer69 is not compatible with V4A.

The apk is best to be in the /system/priv-apps folder. On PowerAmp, you need to turn off "Direct Volume Control." On some other apps, you need to disable "MusicFX" .

For Android 6:

Viper4android and compatible busybox: how to install, modified version for the joying Sofia Intel: https://xdaforums.com/showpost.php?p=72123641&postcount=134

You need to install the busybox from this link too, the busybox version provided by surfer69 is not compatible with V4A.

The apk is best to be in the /system/priv-apps folder. On PowerAmp, you need to turn off "Direct Volume Control." On some other apps, you need to disable "MusicFX" .

How to tweak Viper4androids to get the best Sound: https://xdaforums.com/showpost.php?p=72207583&postcount=164

- Apps, plugins, mods that upgrade the 3-band equlizer

Viper4jJoying mod is fixing that too

modified DAB+ app:

highly recommended fo people using the DAB+ app. Great changes and fixes:

https://xdaforums.com/showpost.php?p=72696072&postcount=47

huge thank you to realzoulou for his work on this. Finally one of my most used apps are running like it should.

DAB+ reception problems:

issue is mostly a wrong location of your DAB+ antenna. I figured the delivered DAB+ antenna has a surprisingly good reception quality but close to e.g. an ECU the reception is near 0 due to the HF frequency field produced by the ECU "kills" the DAB+ signal so the DAB+ antenna has nothing to receive.

Here you find DAB+ tips for antenna position and points to be taken care to chose the right one.

https://xdaforums.com/showpost.php?p=71700817&postcount=64

How to run Pandora in Europe on your joying: https://xdaforums.com/showpost.php?p=72015408&postcount=120

to be continued.

XDA rocks. Thank you for everybody participating and making the joying a great sounding device, stock it is not but huge potential is there :)