Ear Force X51 - FAQs
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Troubleshooting - FAQ 
X-51, X-52 Volume level difference between Left & Right:
Q.  I have the X-51 headphones that is way too low in the right ear piece.  
    I returned one pair only to see that the replacement pair also suffers 
    from the same problem. Any suggestions?

A:  -  It sounds like you would need to adjust the 'Pan' level in your Sound 
       card's mixer (Left & Right stereo adjustment) 
    -  In your sound cards' mixer, there should also be a restore defaults 
       setting. Restore the defaults and the problem should go away.
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