Spotify has graphic EQ on Android (natively) and iOS app (it bypassed general Apple Sound settings). for desktop it's not implemented (yet), but you can find the idea for it right here.
If you want to use Equalizer on Windows, there's quite an easy way actually: check out brandon-1313's Solution. Apparently there are apps like Equalify and EqualizerAPO, where the second one seems to be free. Equalify costs some. Let me know if you need more help!
SebastyRock Star 18
Help others find this answer and click "Accept as Solution".
If you appreciate my answer, maybe give me a Like.