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Is there an easy way of forcing mono sound output - for one ear, one earphone, one speaker?

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up vote 10 down vote accepted

~VIA~ Translated from French (and considering the correction signaled at the end of the forum page)

You can use the module to remap pulseaudio:

In a terminal:

pacmd list-sinks | grep name:

It will send you the name of the stereo output used. Then you type (replacing with the name you have found):

pacmd load-module module-remap-sink sink_name=mono master=THE_NAME_FROM_THE_PREVIOUS_COMMAND channels=2 channel_map=mono,mono

(In my case that was:

pacmd load-module module-remap-sink sink_name=mono master=alsa_output.pci-0000_00_1e.2.analog-stereo channels=2 channel_map=mono,mono

)

If you open the Sound Preferences you should now have a mono output available. To have that permanently:

gksudo gedit /etc/pulse/default.pa

then you add in the file:

#Remapping output stereo to mono
load-module module-remap-sink sink_name=mono master=THE_NAME_FROM_THE_PREVIOUS_COMMAND channels=2 channel_map=mono,mono

enter image description here

(The image is from the sound settings of Elementary OS Luna).

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Very Useful... ;-) – Wilf Jan 26 '14 at 18:10
1  
How 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? – jesterII Jun 27 '15 at 20:47

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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I get the same sink name as you, but when I run the command I get the output: >>> Module load failed. Using Ubuntu 14.04 – TenLeftFingers Aug 31 '14 at 15:40

Installing Gnome Alsa Mixer, there are some options:

"Mono Output Select" and "Mix Mono"

enter image description here

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