Good players generally include equalizers. For example, vlc under "Show extended settings" has 3 controls: Equalizer, Compressor and Spatializer:
http://lxlinux.com/vlc-settings.jpg
The Equalizer offers presets by genre.
I have no experience with pulseaudio equalizer, because on my set-up (openbox) it requires an additional 41 packages installed or upgraded, which involves 43 MB additional space.