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UNi Xonar FAQ & troubleshooting guide

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1. You encounter audio settings problems , crashes or installing a new driver doesn’t work.  + Driver cleaning guide. (updated 13.05.2012)

Usually this is solved with a reinstall (uninstall and install) of the drivers, but sometimes it is necessary for a more deep driver cleaning besides the one  done by the UNi Xonar installer.

Driver cleaning guide:

  1. Uninstall any Xonar drivers (search for Asus Xonar and/or UNi Xonar)  and restart after that.
  2. Download and run (as administrator) driverclean.bat.
  3. You have to download and install Driver Sweeper or its successor, Driver Fusion. Select ASUS Sound -> press Analyse -> press Clean.
  4. Install UNi Xonar drivers.

2. ASIO doesn’t work with some applications and it worked with the original drivers.

You need to reconfigure the ASIO device output in the preferences of the audio application you are using.


3. Using UNi Xonar with C-Media Audio Center and can’t set the headphones gain, switch output to front panel or change sample rate? (updated)

The easiest way is to launch the Asus Xonar Audio Center (Start->All Programs -> Uni Xonar Driver) and change it from there.

Alternatively,  you can download the Standalone Apps package listed in the main UNi Xonar Page, and use the applications you want to change the settings. This is recommended so that you don’t get a increase in DPC latency or other system interferences with the launch of Asus Xonar Audio Center.


4. How to enable stereo upmix (2.0 channels signal to 5.1/7.1 speakers)? (updated 19.07.2014)

a. Through the drivers

Check “Re-enable stereo upmix to 4,5.1 and 7.1″ option in the UNi Xonar driver installer. This option works slightly different in Win Vista/7/8 than how it works in Win XP:

  • On Windows XP if you set the output to 6 channels you always get the upmix (with stereo upmix option checked).
  • On Win Vista/7/8 it works if you set this settings in Asus/Cmedia Audio Panel: set audio channels to 2  and analog output to 5.1 speakers. Caution: it won’t work if you set audio channels to 6 and analog out to 5.1. By selecting this your Windows and other applications will output the sound from 2.0 format to 5.1 speakers and not 5.1 format to 5.1 speakers.

An alternative for enabling stereo upmix is to enable Dolby Pro Logic IIx and this should upmix the the 2 channel signal to all the speakers. Enabling GX in order to have a working stereo upmix in Win Vista/7/8 is not recommend because of the crashes and issues that arise because of GX (see Q&A 11).

b. Through players settings

Possibly a better way to enable stereo upmix is to enable it on a case by case basis through your Audio/Video player settings.  Some players need a dedicated plugin in order to do this (like Channel Mixer for foobar2000). In this case the Asus/C-Media Panel settings need to be 6 channels and 5.1 speakers or so, depending on your audio system.

5. How to save your current settings? How to manually edit the Xonar settings in the registry? (updated 02.03.2012)

5.1. Finding settings path in the registry

1) Press Start -> Run or Search field and type regedit
2) navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet in the left pane
3) Press CTRL+F and type BassBasedBLevel and click find, this will jump you to xonar registry settings path. This “folder” (0005\Settings or any other number)  is where the Xonar settings are stored.

5.2 Exporting
Right click on Settings “folder” and click export. Type a name and click Save.

5.3 Edit 

Before importing, check your current registry path for the Audio card  settings, as they might be not stored in “0005”(or any other name) like it was when you saved the registry. If this is different, you need to edit the previously exported reg file (right click->edit) , and replace the old path with the new one (example: …005settings to …011settings). Save the file.

5.4 Importing

Double click on the saved registry file and press “yes” when prompted. Note that you need to restart your PC or disable and enable your Xonar card in Device Manager in order for settings to apply.

TIP: By exporting and importing the Xonar registry settings, you can save your settings before uninstalling the drivers and installing a newer version. In this case, you have to import it after you’ve installed the driver. In order for them to apply you need to either restart your PC or disable/enable Xonar Card from Device Manager.

6. What is Panorama Enchantment in Dolby Pro Logic settings?

HunterZ: Panorama effects usually cause the sound to “wrap” around to the surround speakers, creating a larger and/or more immersive stereo stage. A lot of Dolby ProLogic II Music decoders have a similar effect when decoding in music mode.

7. Does sample rate automatically change  with ASIO 2.0 depending on audio files sample rate? 


You will usually hear a pop when you change to music with different sample rate.

8. How to add/change sound delay to the rear speakers & center?

  1. Navigate to the settings path ( see 5.1. Finding settings path in the registry paragraph)
  2. You have the following variables for adjusting delay LsRsDelay , CenterDelay , LbRbDelay – for side/rear , center , rear in 7.1 . If you don’t have them you need to create them, Right-click on black space -> New ->Binary value.
  3. Double click on the variable you want to edit, and instead of 000000 type 050000.This should add a delay of 5 seconds to the channel you are editing. The settings are in hexadecimal form. Some examples: 9 ms is “09 00 00 00″, 10 ms is “0a 00 00 00″ , 11 ms is “0b 00 00 00″, 15 ms is “0f 00 00 00″ , 20 ms is “14 00 00 00″
  4. For new settings to apply you either need to restart, or disable and re-enable the Xonar card from Device Manager

9. What are best settings to achieve best audio quality, performance and functionality from my (Xonar) card?  (updated 06.03.2014)

In Asus/C-media Control Panels :

  • Keep Sample Rate at 44.1 kHz , this is generally valid for most media (games, movies, music), while video DVDs use 48 kHz. Increasing Sample Rate without having a source that’s encoded at a higher sample rate won’t improve sound quality and in fact it will degrade it.
  • Select Audio Channel/System input (present only in Win Vista/7/8) and Analog Out/System Output settings based on the number of speakers that you have. For a 5.1 audio system select Audio Channel to 6 and Analog Out to 5.1. For a 2.1 audio system, select  Audio Channel to 2 and Analog Out to 2.  By default, selecting more channels than the number of speakers you have connected won’t enable you to hear more sounds or hear the footsteps and positioning of enemies better in games.
    • If you wish to emulate 8 channels surround on a 2 channel headphones you need to enable “Dolby Headphones” and “7.1 virtual speaker shifter” after setting the number of channels to 8 and analog output to “Headphones”.
  • Keep GX (Xear 3D in C-media Panel) disabled. GX is responsible with enabling EAX effects in some games, but its know to cause crashes and audio loops in games and other applications while this is enabled.
  • Be careful with what you enable. The effects will increase the DPC latency which in turn could cause other problems like audio/video desynchronization or slow network/internet speed, and they also change the sound not always in a good way, you might like it for your music but it might harm the audio positioning in games.

In Windows:

  • (Windows Vista/7/8 only) : Setting the Windows audio playback to 24 bit might improve audio quality. Right click on volume icon in tray, select Playback devices, double click on (Speakers) Xonar card , go to Advanced tab and in the Default format entry select 24 bit 44100 Hz (studio quality) as shown in this picture. While you can change this to 32 bit, this probably isn’t needed. Many Xonar cards only support up to 24 bit and even if this wouldn’t be the case, setting Windows audio playback to 32 bit won’t usually have a improvement in quality compared to 24 bit.  You can find detailed information on audio bit-depth here.
  • Don’t increase the Windows Audio Volume to 100%, and instead set it to 80-90% max.  Issue regarding setting volume to 100% is described here.

In audio/video applications:

  • Enable the  audio output/playback to 24 bit instead of 16bit, as this  might improve audio quality. This setting is application specific  so you will have to search for it in application preferences/options. For example, in Winamp the setting is located in Preferences->Playback->Allow 24bit. If you have Windows Vista,7 or 8 then you have to enable 24 bit output in Windows as well.
  • If you use ASIO as playback output, recommended settings would be Bit-Depth:24-bit and Latency: 10 ms or above.

In games:

  • In game Options -> Sound Quality set Medium or High depending on the importance of sound quality in that particular game. Setting this to High might cause to much strain on your CPU and this in turn will affect the FPS of that particular game.
  • In-game options: make sure you have properly detected or set  the number of speakers you currently have connected.

10. Audio in Flash player (like from videos in is upmixed to 5.1 although stereo upmix is disabled. Why is that? (updated 19.07.2014)

It’s a bug in the Adobe Flash Player (info1info2) which might not be fixed by Adobe any time soon.

There was a fix made by someone but it might not work with newer flash versions and it does not work on Win 8 . You can find the fix here. Follow the instructions in the readme.txt file.

If you are mostly viewing clips on, a possible workaround would be to watch the videos in HTML5 video player instead of Flash player. To do so, go to youtube html5 page and turn “HTML5 Video” on.

11. Why is GX (EAX emulation) bad?

In most of the cases it doesn’t even work and the worse part is that while having GX enabled any audio application that you use is prone to crashes or make your whole system crash (BSODS).

Asus/C-media emulation of EAX capabilities is disastrous  and should have never been released in this state and marketed as a feature. Want a reason to sue Asus? This is it.

12. My antivirus says that the UNi Xonar driver package has a virus or trojan?

If you’ve downloaded the drivers from the official links then the virus warning is a false positive. Possible causes are the packaging of the drivers or the presence of driver cleaner in the UNi Xonar installer which deletes the Xonar driver files from Windows folder.

While it’s highly unlikely that UNi Xonar driver packages would be compromised and be infected with actual viruses, if you really want to be sure then you can submit the driver package for analysis to for a wider analysis.

Furthermore, UNi Xonar driver installer (again from the official links)  does not contain any adware, spyware or PUP (Potentially Unwanted Program).



  1. Benyba    23 Dec 2014 @ 16:46   

    Hello, seems that Xonar are not compatible with newest Intel chipsets (X99 / C610) anymore. Which I can confirm for having tested every possible scenario with no success. Does anyone here has a working Xonar card on such platform ?


  2. Quade`    24 Dec 2014 @ 16:00   

    Hello, I have a STX II on my X99 platform and UNi Xonar v1.75b rev.2 does not detect my sound card when I try to install it. The official Asus driver installs fine so I don’t know what is causing issues with the uni driver.


    • CarvedInside    24 Dec 2014 @ 22:05   

      Hi. Check the possible solutions here.


      • Quade`    26 Dec 2014 @ 12:58   

        I tried both methods in the link, but neither seemed to work.


        • CarvedInside    27 Dec 2014 @ 03:21   

          I’m sorry I don’t know what the issue is. When trying possible solution 1, did installing the drivers from the Device Manager worked?


          • Quade`    27 Dec 2014 @ 06:39   

            When I try solution one, a windows message pops up saying “Windows was unable to install your multimedia audio controller”. When I try to install in safe mode I get “Please Plug-in UNi Xonar Audio device!” message.


            • Quade`    09 Jan 2015 @ 04:34   

              I finally was able to get this installed. I had to run the program in Windows XP (Service Pack 3) in order for it to work correctly, otherwise it wouldn’t detect the STX II sound card with Windows 8.1 x99 chipset.


              • CarvedInside    09 Jan 2015 @ 14:37   

                Strange fix. I think by doing so you’ve actually installed Windows XP Xonar drivers. Please tell the complete Driver Version from Device Manager Xonar card proprieties.

                Which OS do you have?


                • Quade    10 Jan 2015 @ 03:05   

                  The driver version is and I am using windows 8.1 64 bit.


                  • CarvedInside    11 Jan 2015 @ 16:08   

                    Yes, that is the driver for Windows XP. It is pretty unusual that those drivers work on Win 8.1. But what puzzles me more is why you couldn’t manually install the Win8.1 drivers when you’ve tried Possible solution 1. If I come up with something I will let you know.


  3. TC    25 Dec 2014 @ 17:57   

    Installation of 1.75a r2 for my Xonar DG fails with a message that pops up saying “Please Plug-in UNi Xonar Audio device!”. In addition, the computer becomes laggy, with one of my CPU core’s usage maxed due to a driver (not caused by any program) until I restart the computer. I tried cleaning my drivers, but it still happens.


  4. KazCorporation    27 Dec 2014 @ 18:55   

    Hi, thanks for those amazing drivers.
    I used it for a long time for my Xonar D2 and it’s perfect with Xonarswitch.
    BTW, I mounting a computer with the new STX II, and I have a problem : I haven’t the DTS interactive, only the Digital Live, is it normal ?
    The specifications from Asus tell us the STX II supports DTS interactive like my old Xonar D2…



    • CarvedInside    28 Dec 2014 @ 03:36   

      I am not seeing DTS Interactive mentioned on ASUS STX II specification page. But it is mentioned in the manual. I think DTS Interactive is also missing from the ASUS drivers as well (which UNi Xonar drivers are based on). That could mean they forgot to add the support in the drivers or removed the feature from the drivers on launch. Check to see if it’s missing from original drivers as well and if it is then I suggest you contact ASUS support.


  5. viksmile    28 Dec 2014 @ 17:37   

    Hi. I have tried to install ASUS XONAR DX under Windows server 2008 R2. But doesn’t work neither original nor unix driver.
    TEST Speakers in Xonaur audio center produce sound ok. But windows not. “No sound otput device installed” message in windows sound option.

    Any help?


  6. Confused    07 Jan 2015 @ 11:58   

    Hello. I’ve been trying to install the latest Uni update, but the install program crashes every time. I’m not able to even make it to the second page before it crashes. Any idea why this might be?


    • CarvedInside    07 Jan 2015 @ 13:02   

      Latest meaning 1.75a? Do you have the same issue with about 1.72?
      If you’ve used UNi Xonar installer addons,do you currently have any addons in the Addons folder?
      Which OS and audio card do you have?
      Maybe you can upload a screenshot with the error you get, if you get one.


  7. nicholas    20 Jan 2015 @ 21:37   

    im seriously going mad, i installed a xonar d kara a few days ago and it worked fine.. until the driver stops working and keeps popping up this chinese warning in which i have no idea what it means, and now the 5.1 analog somewhat works but the mic jack doesnt… could somebody please PLEASE help me



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