I'm on my phone atm so I cannot look it up properly but many people say that the HD 558 to 598 mod is not real.
The 555 to 595 mod however worked perfectly.
Also parts like the grill as well as some others are different.
The drivers are also different from head fi reviews
Are they wired up exactly the same? Use the same wiring?
Plus 558's are hardly cheap the price difference between them and 598's is a few quid. 598 were as low as £140 brand new a couple of months back.
The mod doesn't make it a 598 but it opens it up more. 598 is still built better.
Yeap they are pretty much exactly the same inside. The drivers are the same, the wiring is the same. Build quality is the same. The only real difference, as mentioned is the black tape stuck to the inside of the housing on the 558 and the different shaped grill.
Have you actually heard both phones? before and after the mod? You keep mentioning headfi as if it supports your argument, but yet the information you got from head fi is wrong, about the drivers for a start, so how can you trust the rest of what those reviews say?
At the end of the day 2 people here, who have both phones and done the mod say they sound very close. And Rids57 linked to a professional review site who says the same thing.
Are you still going to say that we are talking rubbish?