I have the M50s also, and can't say for one little bit that they are either harsh or bright. In fact I bought them to replace a pair of M3s, which have been "professionally" reviewed dozens of times with never a negative comment. In many years of listening, I've not heard a single bad sound from them!! So at update time I opted for those speakers that seemed to most closely approximate the M3s: The M50s.

The M50s are a tad more foreward than the M3s, and tend to enlarge the orchestra being listened to, to "full-sized"(imho) status. They also seem to have a slightly clearer mid-range, and more accurate mid-bass than the M3s.

So, "harsh and bright"? Nope, not in mine-or most anyone on these posts who've heard thems-opinion!!
Rich.