eq+

eq+ is an in-browser Parameteric Equalizer that will equalize audio from your tab of choice. Boost bass on your favorite tracks, make speech in videos more understandable, or tweak the sound however you desire with the intuitive interface. Save as many presets as you want. Customize eq+'s colors to get the look exactly how you want it. eq+ is designed to be as flexible as you want it to be. eq+ is open-source and free (and always will be)!