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[DVDRey]

 
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are the senn hd558 neutral? are they as "dark" as people say, or not?

 
Dark?? No, they are bright, just slightly less than HD598.
 
And yes, there is much more room for the ears than K240 series.
 
HD558 is relatively balanced. No problem with rock and metal, but maybe not the best headphone for rap.
 
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im looking for a flat/balanced/accurate phone that is semi or fully open back, circumaural and my budget is about $150

 
HD558 is effectively one of the best choice available in your price range. HD598 is just slightly more refined and detailled, but with lesser bass.

 

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[DVDRey]

 
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know the ear cups are replaceable, but how about the fabric on the underside of the headband? also why would they not suite well for rap?

 
Fabric on the underside of the headband?? Its the same material than ear cups and its normally replaceable.
 
Not suit well for rap 'cause they aren't a bassy headphone, but its just my opinion.
 
 
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according to the chart, theres not much more brightness in the hd558 than the hd650??

look after 10 000hz, but believe me, HD558 is much more bright than HD650.
 
 
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but the k240 seems to have much more bass and brightness.

 
According to the chart, more bass, yes and they seem very bright, strange graphics, maybe an error during their review. I haven't tried K240, but K242HD is not as bright.
 
 
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i just want to be sure i dont get stuck with a colored phone before i purchase them.

 
According to the chart, K240 seem less balanced than HD558. I don't find HD558 colored at all, maybe slightly warm, but excellent all rounder for the price and much more efficient than HD24. series.

 

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[DVDRey]

HD558 has a big soudstage, better than K242HD imo.
 
The graphic show than HD558 has much more treble (high) than HD650 et K240.

 

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[DVDRey]

Yes imo, but everything is relative.

 

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[DVDRey]

I don't know, i never had this problem.

 

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