Customize headphone audio levels on your iPhone or iPad - Apple Support
Kirkville - The Best iTunes and iOS EQ Settings for the HomePod
Best EQ Settings for AirPods Spotify on iPhone, iPad
I think i just tweaked the best eq settings for S21 series speakers. see for yourself and tell me what you think. its even better than normal and rock settings.ur welcome :
Best Spotify Equalizer Settings For Airpods & Airpods Pro?