semantics aside, i have no aversion to treble per se.
my concern centers around any "harshness" that would contribute to listening fatigue. i want to be able to have long listening sessions without tiring my ears out.
I don't quite understand what MaloS means by treble
energy, which is probably a sign that my audiophile lexicon is weaker than most around here, but that being said I still can't say I notice any prominent characteristics of the DA100.
In response to your concern regarding harshness, I can say that I preferred the DA100 to the Benchmark DAC1, which I found to have slightly pronounced treble and it sounded a little shrill. Obviously the DAC1 is well regarded here, and I am not by any means making a universal statement, but to my ears the DA100 was more natural in its presentation and a little smoother than the Benchmark.
Fatigue is probably the last word I would use in a description of the DA100, and that isn't to say it lacks detail. I think people often correlate a lot of resolution to fatiguing and unlistenable sound, which I don't think is true association.