With the iTunes equalizer, you can adjust music properties, such as bass and treble. You can customize the sound for different genres, rooms in your home, or specific speakers.
To adjust audio frequencies for a song:
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Choose Window > Equalizer to place a checkmark next to it.
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Do one of the following:
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Choose a preset option from the pop-up menu.
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Drag the frequency sliders up or down to increase or decrease the volume of a frequency (in decibels).
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The equalizer’s settings are applied to the currently playing song.