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I'm using Debian. I know how to remap to mono... 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 ... but how do I remap to get all sound (mono) through one speaker?

martin-tct
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  • note: this question was 99% answered by brunetton https://superuser.com/a/1184812/969070 missing part is how to channel the new mono sound to one speaker only. interestingly, the gui settings in GNOME won't let me adjust the balance of the remapped output. – martin-tct Jul 29 '19 at 20:31

1 Answers1

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  1. Downmix your audio channels from source sink to new mono sink with module-remap-sink, see https://superuser.com/a/1184812
  2. Shift the balance to the left channel with amixer set Speaker 100%,0%, see https://superuser.com/a/317297

There are some explanation:

  • Before (1) you have to configure source sink balance to center (0% or 100%/100% in Alsa) and volume to 100%.
  • After (1) Master will have "Playback channels: Mono" and the balance cannot be adjusted, so you'll have to find with amixer all mixers capable of pvolume and having non-mono channels, i.e. Playback channels: Front Left - Front Right. In my case this was the Speaker mixer.
  • Also, in my case there is right speaker degradation but on low level it's still works, so I've set amixer set Speaker 100%,30% until replaced the laptop speakers.
frost-nzcr4
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