It is an app with an icon that looks like a set of grey cogs usually located on the home screen.


The Settings icon might be in the "Utilities" folder instead of the desktop.;
, It is in the sixth group of options.
 It is in the “Playback” section of the menu.
 A blue checkmark will appear next to the setting to mark your selection. The EQ setting will now affect the bass, mid, and high frequencies of songs that you listen to through headphones or through your iPhone's built in speakers.For an EQ with a lot of bass or high frequencies, select Bass Booster or Treble Booster respectively.
Select Vocal Booster to enhance the vocal portion of a song.
You can select genre specific EQs such as Jazz or Hip Hop to enhance specific types of songs.
Open your iPhone's Settings.
Scroll down and tap Music.
Scroll down and tap EQ.
Select your desired EQ setting.
{"src": "wikihow-all_validation", "title": "How to Choose an EQ for iPhone Music"}