Mono sound output in Ubuntu?
Solution 1
This answer is a mix of the two answers, witch are not generic (channels names "left" and "right" are defined by the soundcard vendor and can vary).
The global idea is to use module-remap-sink as suggested by other answers. We will replace [skinID], [left_channel_name] and [right_channel_name] by values found later:
pacmd load-module module-remap-sink sink_name=combined-mono master=[skinID] channels=4 master_channel_map=[right_channel_name],[left_channel_name],[right_channel_name],[left_channel_name] channel_map=[left_channel_name],[left_channel_name],[right_channel_name],[right_channel_name]
This will create a double-mono sink output that we can set to be the default one (done below).
1 - find [skinID]
pacmd list-sinks
In my case, only one sink is present; corresponding to the only sound card available:
index: 0
name: <alsa_output.pci-0000_00_1f.3.analog-stereo>
=> I can use either "0" or "alsa_output.pci-0000_00_1f.3.analog-stereo" for [skinID]
2 - find [left_channel_name] and [right_channel_name]
pacmd list-sinks | grep -m1 "channel map:"
In my case, it gives:
channel map: front-left,front-right
So, for me [left_channel_name] = "front-left" and [right_channel_name]="front-right"
3 - Apply changes
To make changes effective, I'll to run (in my case)
pactl load-module module-remap-sink sink_name=combined-mono master=0 channels=4 master_channel_map=front-right,front-left,front-right,front-left channel_map=front-left,front-left,front-right,front-right
pactl set-default-sink combined-mono
=> the first command's arguments are to adapt to each case ! Read the entiere post for details
To verify, you can play this video
4 (optional) - Make changes permanant
To keep this settings and have them applied each time the computer starts:
- copy
/etc/pulse/default.pa
=> ~/.pulse/default.pa (if not already done) -
add the two commands to the end of file, without "pactl " at the beginning
=> in my case, this gives:
load-module module-remap-sink sink_name=combined-mono master=0 channels=4 master_channel_map=front-right,front-left,front-right,front-left channel_map=front-left,front-left,front-right,front-right set-default-sink combined-mono
Solution 2
Yet another solution. I like command line solution and used it very long time.
But I found good application: PulseEffects and there is a way to make mono with good GUI app.
Installation:
flatpak install com.github.wwmm.pulseeffects
if u don't have flatpak
yet (on ubuntu for example), you can install it
Configuration
- Stereo Tools
- Stereo Mix
- LR > L+R (Mono Sum L+R)
Solution 3
I had problems with both of these answers. When I tried the accepted answer, the only thing that would come out of the speaker was noise. After some searching, I found another solution that might work better for you:
pacmd load-module module-remap-sink sink_name=mono master=alsa_output.pci-0000_00_1b.0.analog-stereo channels=4 channel_map=left,right,left,right master_channel_map=left,left,right,right
Replace alsa_output.pci-0000_00_1b.0.analog-stereo with the sink name you get from
pacmd list-sinks | grep name:
Follow the steps in the accepted answer if you would like to make this solution permanent.
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Admin
Updated on September 18, 2022Comments
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Admin over 1 year
Is there an easy way of forcing mono sound output - for one ear, one earphone, one speaker?
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Admin over 10 yearsVery Useful... ;-)
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TenLeftFingers over 9 yearsI get the same sink name as you, but when I run the command I get the output: >>> Module load failed. Using Ubuntu 14.04
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Admin almost 9 yearsHow do you change the name of the new sink, to change the default name 'Remapped Built-in Audio Analog Stereo' in the System Settings - Sound GUI?
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Admin almost 7 yearsWarning to people using PulseAudio Multiband Equalizer: this fix successfully put my sound output to mono but the equalizer stopped working.
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Admin almost 7 yearsThese options do not appear on every soundcard; when I installed it the only options there were "auto-mute", "IEC958" and "Loopback mixing", nothing to do with mono outputs.
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frost-nzcr4 almost 4 yearsskinID => sinkID
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Admin over 3 yearsThis was extremely helpful. I'd suggest getting rid of gksudo since it's been removed from Ubuntu though.
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John P over 2 yearsWorked like a charm. My sound card doesn't support mono despite dozens of variants of HD this and surround sound that... has no one else used broken headphones? The other features look great too.
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RedEyed over 2 yearsIt does support mono. Mono is just same signal on both channels. You can always make mono sound physically: just solder left and right channel (on Jack plug) together and you will get mono output.
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John P over 2 yearsThanks for the definition. After trying with Pulse Audio and Gnome Alsa Mixer and looking through all the output options, I never found any option to output mono audio. And no, physically tampering with the hardware does not mean you're producing a mono signal. (Nor is it "support" any more than replacing the hardware is.) Consider BT headphones, Chromecast/HDMI, remote streaming, etc. This came up recently where a (single) YT video was missing one channel (the capture messed up.) Software solutions always, always come before you mess with solder.
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RedEyed over 2 yearsAgree. I mean, that mono si easy deal: just mathematically add 2 signals (left right) and you get mono