Is there an easy way of forcing mono sound output - for one ear, one earphone, one speaker?
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:
Replace alsa_output.pci-0000_00_1b.0.analog-stereo with the sink name you get from
Follow the steps in the accepted answer if you would like to make this solution permanent.
Installing Gnome Alsa Mixer, there are some options:
"Mono Output Select" and "Mix Mono"
~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:
It will send you the name of the stereo output used. Then you type (replacing with the name you have found):
(In my case that was:
If you open the Sound Preferences you should now have a mono output available. To have that permanently:
then you add in the file:
(The image is from the sound settings of Elementary OS Luna).