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 (only needed if there are problems):

Uninstall Xonar drivers (search for Asus Xonar or UNi Xonar)  and restart after that.

  1. Download and run (as administrator) driverclean.bat.
  2. You have to download and install Driver Sweeper or its successor, Driver Fusion. Select ASUS Sound -> press Analyse -> press Clean.
  3. 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 works slightly different in Win Vista/7/8 as to 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_MACHINESYSTEM\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” (0005Settings or any other number)  is where the Xonar settings are stored.

5.2 Exporting
Right click on Settings “folder” (just like in the attached picture) 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 thats encoded at a higher sample rate won’t improve sound quality and in fact it might 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 16 bit , 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 youtube.com) 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 youtube.com, 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?

Most likely it 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 (driver) files from Windows folder.

While it’s highly unlikely that any UNi Xonar driver packages would contain actual viruses, if you really want to be sure then you can submit the driver package for analysis to www.virustotal.com for a wider analysis.



  1. DarkStorm    16 Mar 2014 @ 00:09   

    So i tried the Dynamic (fluctuating) volume when there are 2 or more active sound sources.
    But the workaround does not seem to be very effecient, there is still some loss in sound in game / music wise…

    Can someone perhaps tell is this a hardware limitation or software issue ?
    Im leaning more towards software since this card is waaaay above the standard onboard sound, which works fine in regards to 2 or more active sources.

    Why is it so difficult to fix this in a driver update? i see the post mentioned “unlikely for C-Media to ever fix” does C-Media need to fix it since it is their audio chipset ?

    Im sure it bothers alot of people and they would love to see a fix, im willing to make a Donation for a driver fix that does not require Windows & in game volume tweaking.
    I know it is small issue, but it is damn frustrating.


  2. Radic Dotkey    21 Mar 2014 @ 15:54   

    Does anyone know how to run C-Media Audio Panel (CmiCnfgP.cpl) MINIMISED on Windows startup?


  3. Sascha    30 Apr 2014 @ 12:28   

    Hi Folks,

    if you like to control your Xonar Audio center EQ-settings from your Android phone/tablet, try my Xonar-EQ app from googles playstore.

    It works fine with my Asus Xonar D2 and D2X and it is completly free.

    regards Sascha


  4. Anon    05 May 2014 @ 17:46   

    Is there a way to reduce the echo-ing when using Dolby Headpone and 7.1 Sorround to emulate multichannel on headphones?


  5. Tim    27 May 2014 @ 21:13   

    first of all i want to thank you for your time and effort for fixing that ASUS Drivers.
    I´ve bought an ASUS XOnar DGX , installed the card and your drivers. The connector for front audio has also been connected to the audiocard. To the green audio connector on the rear is always an 2.1 soundsystem connected. If i want to hear via headphones i plug them into the front audiojack.

    The Front audio is working, but if i unplugg them there is no sound… If i plugg the 2.1 soundsystem into the front it´s also working. Usind my onboard sound the output has been switched automatically. (This feature is also mentioned on the original DGX packaging.

    Pease help!


  6. Levo _Stone    08 Jun 2014 @ 02:04   

    Firstly let me say I love the sound improvements over the official drivers!!!
    Im having a problem tho here with my Xonar HDAV1.3 Slim, the reason I got it was to upmix stereo to 5.1 which with your drivers it does perfectly. but when I try to play a Blu-ray with either TMT5 or TMT6 I get bit streamed HD audio but only until I pause or skip the movie, then all sound cuts out and the picture starts to shudder, completely unwatchable.
    Im running windows 8.1
    Any help greatly appreciated!!


  7. Maurice    13 Jun 2014 @ 11:04   


    I hope you can help me out, I’ve become very fustrated by now with this whole sound thing now working..
    Xonar DX -> Win 8.1 64x -> Teufel Decoderstation 3 (Dolby digital/dts) -> SPDIF coaxial connection
    I followed the guides, did the cleanup, installed the latest UNI drivers, but no sound :(
    What are the settings for UNI which should work? cause nothing I tried seems to give signs of life..


    • CarvedInside    13 Jun 2014 @ 13:39   

      Do original drivers work? Or did the card with SPDIF output ever worked? Does analog output work?
      In the audio panel, tick the SPDIF out. Check that you’ve properly connected the spdif adaptors to your DX. You’ll find the informations in the Asus Xonar DX manual.
      Maybe there is also a specific setting that you have to do in the receiver.


  8. Josh    05 Jul 2014 @ 05:54   

    Hello fellow Xonarians, is there a recommended setting on the Audio Center for a 2.0 speaker setup? From sound card to speakers direct, nothing in-between. Thanks in advance.


  9. Leon Schuitemaker    07 Jul 2014 @ 03:38   

    Hi guys! I’m running into a problem which seems unsolvable! I have a Xonar HDAV1.3 with a H6 daughter board. This is all connected via PCM to a 5.0 setup, so NO subwoofer. The problem I encounter is, I cannot relocate the .1 (subwoofer) channel to the main speakers in any way. I found that in Windows 7 (64 bit) I can set-up the device so the subwoofer is switched off, which should do the trick. But it doesn’t, because even though in Windows the subwoofer is switched off, the signal still goes to the subwoofer, not to the fronts. In the Xonar software I can only pick 2.0, 4.0, 5.1 and 7.1 but no 5.0. So, long story short, the Xonar software overrides the Windows settings. Please, any bright ideas?


  10. 8bitg33k    21 Jul 2014 @ 19:03   

    What is “AEC”?


  11. Holgicz    23 Jul 2014 @ 21:51   

    Hello CarvedInside, I have a Xonar D2X and have problems with 7.1 analog surround sound being distorted, but 5.1 works.

    OS: Windows 8.1 Core x64
    Mainboard: MSI Mpower Z97 PCIe 2.0×1 Slot
    Drivers: UNi Xonar 1.72 and 1.64 rev.2 tested with Low DSP Install Option and no Stereo Upmix Option

    Interesting thing is that the following work/work not in C-Media Panel speaker test / mpc-hv (6/8channel_id.wav/.flac):
    All DSP stuff disabled.
    Headphones: 44.1/48/96 work 192 distorted
    2 Speakers: 44.1/48/96 work 192 distorted
    4 Speakers: 44.1/48 work 96 distorted 192 distorted and slow
    6 Speakers: 44.1/48 work 96 distorted and slow and wrong channels 192 distorted and very slow and wrong channels
    7.1 Speakers: 44.1 slight distortion on FL/FR/FC/LFE/SL/SR and more distortion on BL/BR; BL always on BL and BR; BR on BR but quieter
    48 more distortion on all 8 channels ; BL/BR as above
    96 slow on all 8 channels; all distorted but FL/FR and maybe FC; BL/BR as above; channels almost always in wrong order
    192 even more slower on all 8 channels; BL/BR completely distorted; channel mapping almost always wrong

    The channel assignment problems seem to occur more frequently with higher channel number/sample rate.
    mpc-hc’s seek sliders stocks/slows with the sound.
    I tried various ASIO latency settings but to no avail.

    Now, the really interesting thing is that with Ubuntu Linux 14.04 x64, everything is working perfectly in analog 7.1 ! (I think 44.1 or 48 kHz)
    With Linux (ALSA / PulseAudio), I have not experienced any distortion, nor channel order mixups or things like that.

    Can this be a PCIe/PCI bridge problem? These slowdowns with more channels/samplerates, could they some bandwidth problem?
    I am not interested in 96/192, but would like to have a working analog 7.1 44.1/48 kHz setup.
    The Onboard Realtek ALC1150 (if enabled) is working perfectly with analog 7.1 on both OSes.


    • CarvedInside    25 Jul 2014 @ 23:24   

      Just to clarify things for my knowledge. You’ve tried playing with Media Player Classic Home Cinema? Did you actually use ASIO as audio output in MPC-HC? Have you tried with Direct Sound?
      I have one suggestion, look to see if you can setup WASAPI as audio output in MPC-HC, maybe that would work properly.

      It could be a audio driver problem, but that would be out of my reach to fix. If you want, you can contact ASUS and hope they forward the problem you are describing to C-Media.


  12. Adam    20 Aug 2014 @ 20:31   

    So i have uninstalled the Asus drivers, updated the BIOS on my Z87 Sabertooth Motherboard, installed the latest Uni Xonar drivers, got stuck at the end with the Uni driver saying ‘Please connect Xonar audio device’, rebooted. Made Asus Xonar the default output in Windows 7 (64), Ran the Xonar software, and the equalizer shows activity when testing sounds, as well as WMP, however I still get no sound from my headphones from either the front audio panel (where the sound card is hooked into) or the rear lit outut in the back of the sound card itself.


  13. Mike    06 Sep 2014 @ 00:17   

    I just upgraded (or so I thought) from the D2X to the Essence STX. Why is 5.1 not a selection “Analog Out” and you can not adjust the speaker volume individually from the software anymore….


    • CarvedInside    06 Sep 2014 @ 17:16   

      Maybe it’s because STX does not have 5.1 analog output, you need the Xonar H6 addon card for that. If you have the H6 addon card properly connected try uninstalling the drivers and installing them again. Also try with older versions.


  14. Mike    06 Sep 2014 @ 18:28   

    Thank you for the info. I started looking for info on the H6 card and am seeing a lot of references to it not working with the stx. Will it work? I would be looking to run digital out to a receiver.


    • CarvedInside    06 Sep 2014 @ 19:00   

      Please use the reply button properly. When replying to an existing discussion, use reply button floating on the right of the comment you are replying to.
      If you are using a NoScript browser addon then you should disable it so that reply to discussion button works correctly.

      It seems the H6 only works with ST cards. STX is missing the cable connector to H6.


      • Mike    06 Sep 2014 @ 19:08   

        ok thank you for the info.


      • Mike    06 Sep 2014 @ 19:31   

        one more question. Is there a place in the software to adjust each speaker’s volume individually?


        • CarvedInside    06 Sep 2014 @ 19:45   

          You can’t adjust the left/right volumes under mixer tab in Asus Audio Center?
          For analog output: Try Windows Volume -> Playback devices -> Speakers (Asus Xonar STX)-> proprieties -> Level Tab-> Balance.


          • Mike    06 Sep 2014 @ 19:50   

            actually im talking about adjusting each speaker such as the surround left and right. In the d2x software you have that option in the little picture of the speakers where you could move them around and also adjust the volumes.



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