JaZZ
Headphoneus Supremus
The main cause for our different perception may be our different «references», meaning our (previous) standard headphones: Whereas yours are the DT 831 and DT 931, mine are the (foamless) HD 600, the ER-4X and my electrostatics.
I wouldn't call my modded HD 600 dark or rolled-off though - it has very extended highs, but some dip in between around 7.5 kHz, which makes it sound slightly too smooth. The ER-4X and my electrostatics all have markedly neutral balances (to my ears
) without exaggerations in any frequency ranges - in contrast to the DT 880, which has an audible 8-11 kHz accentuation (again: to my ears). But as you mentioned, it's of a smooth, nonfatiguing kind, obviously due to the smooth frequency response curve without accompanying resonance effects.
In comparison to the DT 880 and even to the modded HD 600 the Grado SR 225 with flat pads sounds too dark and downright boring to my ears... no joke! Nevertheless there's a slight sharpness which can have a fatiguing effect sometimes - something the DT 880 competely lacks, despite its brighter presentation.
Well, I can reproduce some of your arguments about the influence of the soundstage on the perception of the treble (as «smooth» or even «rolled-off»), although I don't share this perception myself. By the way, the «Audio» curve shows my own impression of the DT 880's sound quite well: the slightly downward sloping mids and the following treble hump - which, as said before, never appears as sharp or harsh, but sometimes can bring some sort of hardness in play and makes the DT 880's treble slightly less natural than the (foamless) HD 600's, to my ears. Nevertheless it's the more detailed and more attractive sound, which is why the DT 880 has become my standard headphone - recently again beside my electrostats. I can't praise its high resolution enough, remarkable for a dynamic headphone.
I wouldn't call my modded HD 600 dark or rolled-off though - it has very extended highs, but some dip in between around 7.5 kHz, which makes it sound slightly too smooth. The ER-4X and my electrostatics all have markedly neutral balances (to my ears

In comparison to the DT 880 and even to the modded HD 600 the Grado SR 225 with flat pads sounds too dark and downright boring to my ears... no joke! Nevertheless there's a slight sharpness which can have a fatiguing effect sometimes - something the DT 880 competely lacks, despite its brighter presentation.
Well, I can reproduce some of your arguments about the influence of the soundstage on the perception of the treble (as «smooth» or even «rolled-off»), although I don't share this perception myself. By the way, the «Audio» curve shows my own impression of the DT 880's sound quite well: the slightly downward sloping mids and the following treble hump - which, as said before, never appears as sharp or harsh, but sometimes can bring some sort of hardness in play and makes the DT 880's treble slightly less natural than the (foamless) HD 600's, to my ears. Nevertheless it's the more detailed and more attractive sound, which is why the DT 880 has become my standard headphone - recently again beside my electrostats. I can't praise its high resolution enough, remarkable for a dynamic headphone.
