How to Use a Graphic Equalizer

A graphic equalizer, more commonly known as an EQ, is used to change the frequency response of selected sounds, such as particular instruments or vocals in an audio track. It can be used to enhance the bass, reduce the treble, highlight a saxophone, or just make your audio sound better overall. Once you get a handle on the basic operation of your EQ model, you can use it to make simple audio adjustments, then get into more detailed audio fine-tuning.

[@alfonsosteenen]

How to test your ears.
On Android 13 phones:
Settings - Sounds and vibrations - Sound quality and effects - Adapt sound - Test my hearing
OR
Settings - Accessibility - Hearing enhancements - Adapt sound - Test my hearing
Hope this helps

[@n.m.saseendran7270]

Very useful information.

[@msoles30]

What apps are those for custom eq presets based on hearing