How to adjust the sound effect of Apple's mobile phone?

Take the iPhone 7 mobile phone as an example, and the specific methods are as follows:

First, click the "Settings" icon on the mobile phone desktop, as shown in the following figure.

2. After entering the setting interface of the mobile phone, drop down the menu and select the "Music" option, as shown in the figure below.

third, open the "equalizer" in the music interface, as shown in the figure below.

fourth, you can set the sound effect of the mobile phone after entering, as shown in the figure below.