Well the built in media player doesn't have an eq so the way i see it, possibly the wrong way, is that there are two options. One is, I seem to remember there being a thing on my old gentoo box that would interface with the sound card and you could set things like that. The other way would be to write a new media playing application with an eq, which would probably be resource intensive too. Hopefully someone else has more of a clue than me about this, I'm just throwing stuff out there.