How to Assign Equalizer Presets in iTunes
You set equalizer presets to assign them to your iTunes content. Equalizer presets are settings made in advance and saved by name. You can quickly switch settings without having to make changes to each frequency slider in the Equalizer dialog. iTunes comes with more than 20 presets of the most commonly used equalizer settings, including ones for specific music genres, such as classical and rock.
To choose an equalizer preset, click the Equalizer’s pop-up menu, as shown here, which by default is set to Manual. If something is playing, you hear the effect in the sound immediately after choosing the preset.
You can assign standard iTunes presets or your own custom presets to specific items (songs, audio books, podcast episodes, and videos) in your iTunes library. You can then enable the iPod or iPhone equalizer by choosing any equalizer setting (other than Off) so that the iPod or iPhone uses the item’s equalizer preset for playback.