I don't have a surround configuration, so I'm not certain if there's a better way to solve this problem. The point of equalizer used by this script is not to redistribute volume across speakers.
Originally Posted by mojo2012
Anyway, the best way to boost sound is to enable "flat-volumes" in PulseAudio, which will ensure that equalized volume is just as loud as regular audio (at least on my system). Here's the easiest way:
Note that the above command will (necessarily) force PulseAudio to restart, so any running sound applications will also need to be restarted.
$ sed 's/flat-volumes = no/flat-volumes = yes/g' /etc/pulse/daemon.conf >~/.pulse/daemon.conf; pkill pulseaudio