alexzogh
Head-Fier
Probably because they are warmer without the peaky treble, most flagships aim towards a much brighter and clinical sound which can be really impressive on quick listen but its the headphones like Empyrean that let you listen for hours with a smooth and rich sound.
That's definitely a part of it - They can be enjoyed with more genre's of music than most headphones. The other is they changed their sound over time - almost like a break in period, although I'm not usually a believer in such things,