ok , you can get all of the technical jargon from other review , but I want to weigh in on these great headphone - they be hand down my favorite headphone I have ever own -lrb- a I have spend MUCH more on other over the year -rrb- . the sound be SUPERB , and they be by far the most comfortable headphone I have ever try . I would recommend these over any of the $ 50 + headphone I have try . my only concern be the plug do not look very sturdy , but after 3 month of pretty heavy use , so far no problem ! I give these my highest rating !