This, straight up, does not work. I opened Spotify and turned on some music and there is no difference. I even tried refreshing, saving presets, using built in presets, etc. Just doesn't do anything at all.
I have been trying to find a good equalizer for my mac. Sadly, they either don't work or are expensive for how simple an equalizer software is. It really should be built into the OS, especially considering that Apple created the iPod and how connected they are to the music industry.