I have a pair of Audio-Technica ATH-M50's and they are excellent headphones and sound very "accurate" but my main complaint is that they wear my ears out, even at relatively low volumes. I would describe it as "ear fatigue" in which after about 20-30 min I have to turn the volume lower or take a break from listening. I've heard the same thing described about Klipsch floorstanding speakers which are very "bright" and cause ear fatigue, but I'm surprised that this is less discussed with headphones.
Does anyone else have this problem? Or maybe have a suggestion for headphones with a bit softer sound, less bright, and maybe less fatiguing?