Well, that was part of my point with my last post, that they are not fatiguing to me.
But at the same time, we all listen to different music and we use different sources. You will want to use an amp with the LD-3 320. I don't recommend getting them if you'll just plug them into the phone.
Instead of talking in general terms. I'll post a couple of tracks below that gets very fatiguing for me when using the Cygnus, but sounds just about right on the LD-3 320:
Shin Zisu - Hey Jude (Feat. Sleeq) - https://www.youtube.com/watch?v=eGLUeMdUSAk
4MINUTE - Crazy - https://www.youtube.com/watch?v=1nCLBTmjJBY
Cheetah - My Number - https://www.youtube.com/watch?v=Q9ZPYxqZQ2I
Lim Kim - Awoo - https://www.youtube.com/watch?v=CXPADwU05OQ