The width. One guy tested something like 40 well-known headphones and concluded that the 700x and HD 598 are among the best for competitive gaming. Some things that potential buyers need to know: 1. Remove shelf, flip it over to the back side & use blue painters tape across the length of the top covering the hanging slots. Arrived fairly quickly even with the holiday and customs delay. Its also nice as a hot chocolate with hot nut milk. If you jog 5 miles a day in a warm climate or something physically similar I recommend the squaretrade protection plan. Me gustaron, super prácticos. The price is remarkable compared to Apples, but I have not used, so I have no frame of reference. The sound quality is good and it is very stable to use.