Equalizers

Recently I have been messing with the 5oo different equalizer presets on my MP3 players, stereo, and computer with no solid results. In this thread I would just like everyone (who cares) to give a little input on how they adjust there equalizer. For example, do you change it for when your listening to different types of music, do you keep it the same, do you just keep it on factory preset?
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Personally I tend to just put it on a rock preset and turn the bass up some. Not the best, but cant seem to find anything better.