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$su -
$alsamixer
Configure bars with arrows, enable or disable service with "m" key.
When done ESC
#alsactl store
If you have 5.1 speaker system, be sure that LFE channels bars are all way down and [off]. LFE channel is to generate 5.1 emulation matrix on 4 speaker systems.
P.S. KEEP IN MIND THAT SOUND SYSTEM WON'T WORK AFTER THAT PROCEDURE. LOGOUT OR REBOOT IS NEEDED!
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How configure asoundrc for amplify rear spekaers?
