Now at first I thought this kind of setup would only work if you wanted to set-and-forget a single equalizer profile specific to your speakers and/or room, as changing the settings seemed to require that you manually edit default.pa and restart PulseAudio every time you wanted to tweak something. I think it's useful when I plug in my external DAC as I remember at first that could lead to all audio getting muted (but hasn't done that in a long time). I'm not sure the last line doing the set-sink-mute.0 is really necessary, I just copied it from the same kind of setup I had before in default.pa for mbeq_1197. The effects of the control= values are described in the output of "analyseplugin filters.so | grep control" You find out what to use as master= by typing "pactl list-sinks | grep master" into a console and looking for the master_device value The "plugin=filters label=Parametric1" needs to be exactly like that "FonsParamEQ" is whatever you want to call the EQ sink Alternatively, you can do a system logoff-logon or a restart. Stop any sound playback you have running, wait about 10 seconds and restart PulseAudio with "pulseaudio -k" in a console.
Set the equalizer plugin as the default sink by adding these lines to the end of your ~/.config/pulse/default.pa (to be applied every time PulseAudio restarts):
#Equalizer apo not working after uodate install
Install the fil-plugins package from the Ubuntu Software Center (this should give you the plugin file /usr/lib/ladspa/filter s.so). It's something called "FIL Plugins" by Fons Adriaensen and (assuming you already have what you need for LADSPA plugin support) installation goes as follows: The solution I finally found involves the use of another LADSPA plugin and offers parametric equalization with 4 controllable bands. So I need another solution that doesn't break my system sound and offers either adjustable frequency bands or parametric equalization. But! The LADSPA plugin doing the work is locked to 15 frequency bands that offer very poor control where I need it the most: in the high-frequency region (only has 5 kHz, 10 kHz and 20 kHz bands and that's it). That one was well-behaved, it dutifully re-inserted itself into any PulseAudio chain I'd create and worked with any audio hardware I would decide to redirect my sound to and generally gave me no trouble at all. Later when I tried to solve this again I found another solution with a GUI called pulseaudio-equalizer, using the mbeq_1197.so LADSPA plugin to do its magic. The problem is that that solution created all kinds of ugly dysfunctions in my system sound and I didn't want to go down the rabbit hole of trying to fix them all, so I gave up on it. The first solution I tried was to enable the integrated equalizer that comes with PulseAudio, since that one allows the control of a more than generous number of frequency bands once you maximize the GUI (qpaeq). My current speakers have some frequency response deficiencies and I want to compensate for them through system-wide equalization in Xubuntu 14.04.
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