My speakers are broken and play at different loudness from time to time. This means that the off-center parts of music sound wrong. How can I force all sound to be centered, so that the two speakers have the same output?
I'm using ALSA.
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You can adjust the volume of the two speakers independently by adjusting the balance. An application like
alsamixergui will let you do it graphically, or you can use the
amixer command-line tool:
amixer sset Master 70%,30%
This would shift the balance to the left.