I moved from Windows to Ubuntu, and now the music I hear with the headphones sounds with too much bass, like it is set to max.
I looked into alsamixer and pulseaudio, but I can't control bass there.
Depending on your audio player you can set equlizer in vlc.
If that won't help check this link: http://www.unixmen.com/add-equalizer-for-pulse-audio-in-ubuntu-lucid-lynx/
For Ubuntu 10.04
For Ubuntu 12.04