Come on - you are exaggerating. HE-500 has very full, rich mids, regardless of source. Unamped, the mids can be a little muddy, but they are in no way recessed. Some detail may be harder to pick out with HE-500 when they are driven by a weak source, because the transients become smeared. But the details are still there if you listen carefully. M50 can't even begin to approach the resolving power, speed, clarity and richness of HE-500, even if it is driven by the best possible amp and source while HE-500 is unamped. The latter is simply leagues ahead technically. What is your current source BTW? Maybe you truly have an awful source, but anything half-decent like a Sansa Clip or iPhone can drive HE-500 quite OK.
Edited by Pianist - 3/15/13 at 7:45pm