How to Set Audio to Mono on a 3.5mm Jack in EndeavourOS with KDE and ALSA

Hello everyone,

I hope someone can help me with an audio issue I’m facing on my EndeavourOS-powered PC. I have a 3.5mm jack to which I connect stereo headphones, but I would like the audio to be in mono as I only use one ear of the headphones. This way, I can avoid missing out on audio from one channel.

I’m using the KDE desktop environment, and I believe ALSA is the audio system I have by default (I haven’t made any changes during the installation).

I’ve looked through the audio settings in KDE, but I couldn’t find an option to enable mono audio. Does anyone know how I can configure my system to achieve this?

Thanks in advance for any advice or suggestions!

If you didn’t change anything at install, you should have pipewire as the audio system.

What is the result of LANG=C pactl info | grep -i "Server Name"? If it has something like Server Name: PulseAudio (on PipeWire 0.3.83), do mkdir -p ~/.config/pipewire/pipewire.conf.d and then create a file mono-playback.conf in the new directory (cd !$) with the following content:


context.modules = [
    { name = libpipewire-module-loopback
        args = {
            node.description = "Mono Playback Device"
            capture.props = {
            = "mono_output"
                media.class    = "Audio/Sink"
                audio.position = [ MONO ]
            playback.props = {
            = "playback.mono_output"
                audio.position = [ MONO ]
                node.passive   = true

Now restart audio with systemctl --user restart pipewire{,-pulse}.{service,socket}.

You should now be able to configure the new mono output with your standard DE tool.

Set the volume at 80%. It is dependent on the volume of the standard stereo audio. 80% makes sure that the volume is about equal to your stereo volume.

1 Like

Thank you so much, emk2203!

You were absolutely right; I did indeed have Pipewire as the audio system. I followed your instructions, and it worked like a charm. I now have mono audio output!

Thanks for your assistance!

You’re welcome. I am interested in this topic as well, having mono audio for the headphones-half-on case is a good idea. Good that you got it to work without further issues.

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