I am not sure about the drivers. I think i remember seeing elsewhere that they are only like 30$ each. Have you looked up the clay mod for the Senns..? I did it to mine and it dramatically helped. Tightened up the bass and brought out the mids. The highs seemed slightly less tho but I mainly...

The inside of the 558 differs from the casing on the 518 and 598. The only difference (visible) in the casing between the 518 and 598 is the grill on the back of the speaker. The 518 seems to be semi open as the 598 has a fully open grill. 

Ya, I have heard that. And I have also heard that the HD 598 style is something you either love or hate. And I love them. Always have. That is most of my incentive for doing this.

Why buy 558 parts when 598 parts are the same price and they're a better headphone was my question to self. I don't NEED the brown pads, but I know they are more comfortable and they'll match better. Some people said they effect sound too?

Also, I am needing some HD598 ear pads if anyone reading this has any. Sennheiser told me they're on backorder until at least April...

Harmon Kardon AVR 65 and a sony blue ray player for my CD's. Also tried them on Dads Onkyo amp (not sure which model). The headphones do sound good but for $80 I thought it was worth the upgrade. 

Hello all, I am new to the head-fi community. I have read hundreds of posts but never registered. I bought a pair of Sennheiser HD518 a while back and they just were not what I hoped. Don't get me wrong they sound good, but not great. So the other day I looked up how to mod them. I did the clay...