I'm of the same opinion. The HE-500s could use some more treble. Coming from the HE-400s before the HE-500s..while the HE-400s were more annoying and painful to listen to..the treble was at times much more enjoyable to listent o than the HE-500s. The HE-500s treble seems leashed as opposed to rolled off. It'll let you go so high before pulling you back or until you can't go any farther. I wanted more tsh and just got ts instead. Cymbols weren't as nice sounding..snare drums too. The DT880s and HE-400s both did drums better than the HE-500s. The bass was more enjoyable on the HE-400s as well, but ultimately I found myself altering my facial expressions in a painful manner when listening to the HE-400s. They were just a bit too sharp and painful.
HE-500 could use some more treble without hopefully making it sound painful like the HE-400s.
Also for the person that wanted to go back to the Canare cable..I tried the canare cable and the silver cable back and forth and back and forth and could never find a time when I appreciated the canare over the silver.
Thing I love most about the headphone is the price. It's in the perfect price range where you can't beat it. It's just shy of those headphones that could knock it out making it an excellent choice if you don't want to spend the extra for those other headphones..it also is nicely balanced. I wouldn't say it's neutral, but it's balanced pretty well. Nice lows, nice mids, pretty good highs. I'm sort of interested in hearing the T1. Never really had a chance to. I'm thinking it's probably like the DT880 but more low end and detail. The Dt880s was a fantastic headphone for the price. It only lacked bass imo. If it had stronger bass I probably would not have moved to the HE-500.
I have the silver cable on my HE-500s and like it more than the canare cable. I don't think it's bright enough, but I guess I don't mind a bright top end as long as it isn't harsh like the HE-400s or other headphones. The DT880s were pretty harsh in the beginning, but I grew to like it over time. It was one of those headphones that could fatigue you if you listened loudly though.
I find it impossible to be fatigued by the HE-500s. The HE-400s could fatigue me.
If I'm listening to high quality recordings I'll usually reach for the HD800 or T1, sometimes I'll mix in the HD600 for fun. If I'll be skipping around including less than great quality, I'll always reach for the HE-500s. The highs are there but they're rolled off just enough to hide most of the nastiness.