Johanbehl

After using low-end earphones so far, I finally decided to upgrade by buying Harman Kardon's NC. Being new to high-end headphones (or whatever they are) I have a quick question for you audiophiles.... It seems that sound quality in left and right (irrespective of the song & who is listening i.e. me or my wife) is slightly different. Overall sound quality when listening from both sides is just fine. But, I am wondering, if this imbalance is normal (what do I know about headphones?) OR is it a technical defect? Hoping for some genuine help!