I believe it is quite common to hear unequally out of your two ears. This is also true one it comes to sight, where one eye will often be dominate. We also have dominance when it comes to being either right or left-handed,with one arm or hand being stronger and better coordinated than the other. Of course it is possible to have suffered hearing loss in one ear. You might consider getting a preamp with tone controls or a good graphic equalizer so you can boost some of the high frequencies. Also high frequencies can be easily absorbed by room acoustics. Your hearing may also vary during different times of the day,change with your general sense of well-being and even weather conditions( low pressure or high pressure fronts)can effect it. If one feels relaxed and physically well, it is amazing how much better you will hear. Fatigue and stress can greatly affect hearing. Exercise which promotes circulation also can have a beneficial affect. Hope this helps.
hearing imbalance
I got into hi fi last year and loving every minute of it and constantly upgrading my system. However, I noticed that most music I listen to lean slightly to the left. I thought it was room acoustics or the stereo recording (since strings in an orchestra are on the left). However, it seems my left ear has better hearing than my right ear especially with high frequency (just plugged one ear at a time and tested). This is very unnerving as I can't enjoy music fully, is this common for many people? How do you go around these problems?