Xonar configuration for 2 speakers and a standalone subwoofer

Guide on how to configure the Xonar card to work with 2 speakers and one standalone subwoofer that is connected directly to the audio card.

Guide for Windows 7/8/10:

  1. Connect subwoofer to Center/Subwoofer output jack.
  2. You need to have “Stereo upmix” enabled if you are using UNi Xonar drivers. Depending on your setup you either have to install drivers installed with “Re-enable stereo upmix to 4, 5.1 & 7.1” option checked or enable it in XonarSwitch.
  3. In the audio panel set the following: 2 channels and 5.1 speakers.
  4. If subwoofer isnโ€™t sounding right, exchange center/bass channels in the audio panel.

To configure the bass frequencies for the 2 front speakers go in the audio panel, select FlexBass option page, set the L/R speakers size to Small and set the Center speaker to Large.

Volume for each speaker can be controlled in the Mixer tab of the cards audio panel.

It’s recommended that you install UNi Xonar drivers because they fix the Rear and Center channel delays which would affect the sound with the above configuration.

Applies to:

  • ASUS Xonar DG, Xonar DGX, Xonar DG SI, Xonar DS, Xonar DSX, Xonar D1, Xonar D2, Xonar DX, Xonar D2X, Xonar HDAV with daughterboard, Xonar HDAV Slim with daughterboard, Xonar Essence ST with daughterboard, Xonar Essence STX with daughterboard, Xonar Essence STX II with daughterboard, Xonar Xense.
  • Other C-media CMI8786,ย CMI8787 and CMI8788ย  audio chipset cards:
    • Auzentech: HDA X-Purity 7.1, X-Meridian 1G, X-Meridian 2G.
    • HTOmega: Claro, Claro Plus, Claro II, Claro Halo, eClaro.
    • Razer Barracuda AC-1.
    • TempoTec HIFIER Serenade



  1. Arne25 Mar 2019 @ 17:33

    What do I have to change in the Windows audio settings? ๐Ÿ™‚


    • CarvedInside26 Mar 2019 @ 00:34

      You don’t have to change anything in Windows. Are you having problems making this work?


      • Arne26 Mar 2019 @ 15:29

        I just set it to stereo sound in Windows (because you can also change it to 5.1). I didn’t have a problem with it, but I was just wondering ๐Ÿ™‚
        But I do have some questions left:
        1. Everytime I start my computer, the subwoofer makes a loud and short noise. Nothing big, but do you have an idea how to fix this?
        2. Can I put the volume of the center and the side speakers to zero in the mixer (as I don’t have them in my 2.1 setup)?
        3. Do I also have to set the side speakers to small in the FlexBass option? ๐Ÿ™‚

        Thanks for your description for this 2.1 setup, it really helped me! ๐Ÿ˜€


        • CarvedInside28 Mar 2019 @ 20:56

          Keep it to stereo in Windows as it will not work if you change it.

          1. I think it’s a subwoofer problem, maybe it does this when the sound source becomes active. If you would connect the speakers to card’s jack where the subwoofer is connected and restart the PC, do they make a similar noise?
          2. You can, but it won’t make any difference.
          3. No, it does not matter. It will only matter if you had additional speakers connected to the side/rear output jack.

          Glad to hear.


  2. Jason20 Apr 2019 @ 11:45

    The Xonar Essence STX doesn’t have a sub or center out. It only has a L, a R, and an SPDIF out. Not sure if it is best to combine and then resplit the L/R or try to find an adapter to use the spdif.


  3. Roxette27 May 2019 @ 14:28

    I do not understand how can two channel an two output work? Whether you set this in windows or the xonar application, all it does is default you two two speakers. The sub is then nonexistent.
    You have to set it to 5.1 output IN windows, not in the Asus panel. The panel does not override Windows.

    My sub only engages when Windows is on 5.1 (with a setting of two speaker, one subwoofer). The Xonar settings are irrelevant at that stage.
    And while the sub works during a Windows sound test, applications and music/games do not recognize the subwoofer.


    • CarvedInside31 May 2019 @ 01:25

      With the guide above the subwoofer will not get the subwoofer channel from 5.1 content (5.1/7.1 movies, 5.1 games) but it will work for all content as a mix of Left and Right channels. This will work for all content including 2.0.

      If you want the subwoofer to be directly addressable and receive the subwoofer channel from 5.1 content then you need to select 6 channels and 5.1 speakers. In this mode, 2.0 (stereo) content like music, youtube videos and 2.0 movies will not send sounds to the subwoofer. To overcome this you would need to mix the left and right channels (stereo upmix) and send them to the subwoofer channel. You could do this either at the Audio/video player level (see “C. Through players settings” section). Or you could mix them globally for all applications by following “B. Through Equalizer APO” section of the stereo upmix guide, at step 5 you could use “Copy: MIX=0.5*L+0.5*R C=MIX RC=MIX SUB=MIX” instead.



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