0. Install Spotify
1. Copy dsound.dll, msvcp100.dll and msvcr100.dll to Spotify's installation
path, which on Windows 7/8/8.1/10 would be "%APPDATA%\Spotify" by default.
2. Restart Spotify if it's running.
3. Play a song and click the green bars in the top left.
4. Finshed! Enjoy Your Music!
Thanks to @Kleberstoff
Equalify Pro features a fully parametric equalizer. You can add as many bands as you please in any location you please.
You can select between Peak, Low-Pass, High-Pass, Band-Pass, Low-Shelf, High-Shelf and Notch filters for each band.
Spotify does not have a built-in way to change the output device, Equalify Pro fixes that with its own device changer.
The new device changer can change the output device on the fly, without needing to restart spotify for the changes to take effect!
Equalify Pro also contains a built-in audio spectrum analyzer that can be used to make your filters perfect, or just for entertainment by watching the graphics dan
Taken from http://www.equalify.me/