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Perhaps M50 is indeed flatter in the mids and highs, but HD555 has a much more neutral (and higher quality) bass response and sounds much natural than M50 overall. M50 may be more neutral in the mids and treble, but the quality of those frequencies is not as good on M50 as on HD555.
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If I were to nitpick with the 555s, they might need more inner detail and a finer grained sound and maybe tighter and deeper bass but I wouldn't want them to have that tubby m50 bass wich is too much in the lower midbass region from 40 to 80 hz



















