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if they have balanced armature design, they will hiss. the better the phone, the more the hiss on a powerfully dirty amplifier. my um2 (very good phones as well as e500 hissed greatly on poor amplifiers).
 
Aren't these released on the 17th? So no1 could know. :)
Anyway, I was thinking of buying them too if the sound is comparable to the SE210. Else I'll rather get the SE210 for just 50 bucks more.
 
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