-Darkstar-
Head-Fier
I've never thought they were harsh up high, just very transparent. I'm middle aged though and I might not be as sensitive to the highs as I once was. A warmer sounding tube amp might soften the highs but the main reason for me is the mids. I think a V or U shaped headphone or speaker for that matter, can benefit from midrange bloom in most tube amps. With these cans, you probably would want a transformer coupled or hybrid, unless you have the money for a higher end OTL like the Zana Deux.