I don't have them now anymore(returned), but I can say go for the 598s(heard they're much better) or momentums(currently using over ear bought bestbuy online for~$200 on sale) instead. The 558s were very underwhelming when I tested them. No better than my old original ps3 headphones which I got used for $60. However the 558 and definitely 598 will need an amp to sound good I believe. Which is why I went with the momentums(ivory I have a review), the resistance is so low you don't need anything, saving hundreds on a proper amp. I bet the 598s with a nice amp and dac if you need it would sound better than my momentums, but I wouldn't know first hand.