The treble was fatiguing? That just doesn't make sense. The treble is so smooth, compared to the quite prominent treble on the HE400. If there is one thing I can personally say about the HD650, its that its the most pleasant, unfatiguing headphone I have ever heard.
Maybe that burson is raising the treble to some nasty levels, because HD650 and fatiguing treble, don't belong in the same sentence.
Nonono, you're misunderstanding. I meant that the treble was a tad brighter / more fatiguing compared to my HE500 (which I also brought to the shop I demo'd from), and the difference is likely in tonal balance around the lower treble. In terms of upper treble HD650s sound very refined (much better than HE400s), just a bit more blurred vs HE500.
We are talking small differences on a relative level here, and compared to the venerable HE500 which are known to have one of the most forgiving and non-fatiguing yet detailed trebles out there.