What you may be hearing is the sound of the strings hitting the (metal) frets. This could be a technique issue. Try playing with a softer touch and see if that changes it. Remember: pluck along the bass, not into it! If that doesn’t help, or if you feel that you’re just one of those players with a heavier touch, a setup may be required to raise the action (string height) a little bit. Plenty of information about that on the forums:
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