Hey guys, I'm sorry about going off track here but auditory fatigue has been a major issue for me lately - this is why I bought hd650 before he-400.
He-400 has been known to be fatiguing with that weird thing in the treble, and I noticed this. It was helped a lot by EQ.
Now to the point:
I quit caffeine, and fatigue takes WAY longer to set in. Used to be 2-3 hours of low-level listening, now its about 7 hours of listening a day before fatigue really affects me. I had to post this because I haven't found anything online that mentions the correlation.