On the graphic equalizer, push all the sliders to the "0" position. Note that this is the exact center of the slider path, not the bottom. This is the point where the audio signal is not being altered by the graphic equalizer.
Adjust the volume slider to a comfortable listening level. It should be loud enough so that you are not straining to hear the speaker output.
Move the lowest frequency slider, normally on the far left side of the graphic equalizer, slowly through its entire range. Listen to how this individual slider alters the audio signal.
Tune the lowest frequency slider to a position you find most appealing. Tuning a graphic equalizer is subjective. There are no right or wrong settings. In addition, settings on one graphic equalizer often will sound different on another equalizer model or for different audio applications.
Repeat Step 3 and Step 4 for each slider. Tune the sliders from left to right.