If you did get the hd 558s, you can actually perform a "foam mod" which takes ~5-10 mins, and is just removing a little piece of foam over top of the speakers inside the headphones
It just opens up the sound and pretty much makes them on par with the hd 598s. Me and two of my friends have the hd558s with the removed foam and all love em
https://www.youtube.com/watch?v=k-kJ7sN16qwThis post was edited by gramkracka22 on May 3 2014 11:44pm