N app that creates a system-wide audio equalizer

audioitunessoftware-recommendation

I like using iTunes' equalizer, but that only works in iTunes.

I'm looking for some software that lets me apply a global, system-wide equalizer to Mac OS X.
The app (or pref pane, etc.) would let me change EQ settings and have that apply to all apps (iTunes, Spotify, Chrome, etc.).

Ideally the software would have some nice presets like iTunes does.

Free preferred, but I'm certainly willing to consider buying something.

Best Answer

Check out Boom, it's quite awesome.

Boom boosts the volume of your Mac at all levels. From boosting the volume of your music on iTunes, it boom the YouTube videos playing on your web browser. You can now boost the volume of any application playing sound or video like QuickTime, Podcasts, Skype, iChat, DVD Player, Garageband, iMovie and so on.

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