You can manually adjust the iTunes equalizer and then save your customized equalizer settings to create your own “preset†to use again. For example, you could create presets for different rooms in your house or different genres of music.
To customize equalizer settings:
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Choose View > Show Equalizer.
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Position the sliders to the desired frequency settings.
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Choose Make Preset from the pop-up menu and then name your preset.
To rename or delete a preset, chose Edit List from the pop-up menu.