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, Xonar HDAV Slim, Xonar Essence ST, Xonar Essence STX, Xonar Essence STX II, 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.



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