Open iTunes and go to "View".
Then go to "Show Equalizer."
Then listen to a song while sliding the bars to get to the sound/quality you want. When you are satisfied with it click the box where it says "Manual" and Click " Make a Preset."
Then name the Preset what you want.
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Applying EQ Preset to song
Right Click the song or hold "ctrl" and select multiple songs and click "Get Info".
Go to "Options" and then go to the drop box that says "Equalizer Preset" next to it. Then click the preset that you made and then press "Okay".
