I can't believe there is no review on this headphone. I will write a brief one because I am really not equipped and skilled to write reviews on this forum as deep and broad as other reviews resulted from extensive tests and auditions.   For sound, I could only compare this one with its wired cousin HD650. I connected them to the headphone jack on an old receiver. I listened to various or materials, classical music, pop songs, R&R, vocal and instruments. The sound is very clear and sound stage is decent. treble, mid range and bass are all nicely...