Ive been fixing some headphones, as it goes i was listening to some reference recordings including left/right channel from JM lab cd2. I was kinda struck by the difference in "volume" of certain frequencies on left and right ear. Long ago i heard some online "science" about hearing different types of frequencies with left and right ear (music/speech) but could not find any additional evidence apart from "scientists say". Therefore i tested once more with youtube video changing sides of headphones and i can confirm that i hear difference between left and right ear. Some frequencies are harsh on right while muffled on left while some are pronounced on left but "masked" on right. Share your experiences on this matter, if you have any. Dont blame me for pointing out something you didnt notice till now (uncomfortable tongue syndrome).