Yup, like everyone said, check your region setting.
I just plug my M50 to my clip+ and I can't imagine anyone listening to max volume all the time, It is definitely way to loud (official firmware) and I probably already do listen to music too loud already... atleast according to all my friends...
Rockboxed, it gets even louder at max volume... but still, I can't imagine M50 + clip+ (official firmware) at max volume is not loud enough for anybody... even those with already impaired hearing.