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Winamp does do it, though it's a very basic graphic equalizer... Though that would be the kind I'd call "simple," so it seems to work for your request.
diarh34, you might also look into iZotope Ozone (plugin for Winamp) for a valve equalizer type sound. The free version is great with default settings. Otherwise Foobar does have a nice equalizer, most other players with Plug-In support have third party options.