In one of his posts Mike @ headfonia.com states that
" The HD598 is a more refined headphone, but less ideal for pop and
mainstream music due to the lesser bass. The HD558 is a better all
rounder. I actually think that although I prefer the HD598, most people
would be happier with the HD558."
Plus the HD558 can always be easily modded to nearly match the sound of the more expensive HD598 that sells for 200+.
This is a Google search of the prices for the HD558. You could also get it directly from electronics expo for $133 after using coupon code 'summer30".
These are, from what I hear, a fairly noticeable improvement over the HD 555. The HD 555 is still worth a look because it sometimes goes on sale for $80-90 on Amazon (it's $95 now), but this is the best price I've seen for the 558.
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