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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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    Does this thread at superuser.com help? – sr_ Oct 9 '12 at 8:23
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You can adjust the volume of the two speakers independently by adjusting the balance. An application like alsamixer or gnome-alsamixer or 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.

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