There are a bunch of sites, like this one: http://askubuntu.com/questions/72679/is ... -equalizer that detail how to install the pulseaudio equalizer.
This is the one I used:
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sudo add-apt-repository ppa:nilarimogard/webupd8 sudo apt-get update sudo apt-get install pulseaudio-equalizer
That is, until I reboot and Linux Mint no longer sees *any* sound devices. Before pulseaudio-equalizer was installed I had HDMI and S/PDIF (by default), then using the Bluetooth tool, I added my speaker.
After, I when I open my sound settings I see this:
There appears to be no way to add in the sound devices afterwards, and removing pulseaudio-equalizer did not go well.
So I had to reinstall Linux Mint - which I probably had to do anyway since I have been upgrading for the past few versions, so a clean install sounded like a good idea. Just for giggles, I decided to do the same pulseaudio-equalizer install on a *clean* 18.1 installation.
I got exactly the same problem.
After install #2, the question is now, what audio equalizer can I install that will not destroy sound capabilities under Linux Mint?