All songs basically. It is not as bothersome really, just that I thought the D5ks are supposed to be more sibilant than the He 400, but my HE 400s have more sibilance. I think my O2 might be adding to the sibilance. The E17 is much better, and with the e17 the Denona have more sibilance. Weird. Maybe I am just imagining things.
I have the rev 2s though, the drivers are white.
I see; then you are just sensitive to the emphasized upper treble present in all HE400 versions, rather than the specific "rev3 brightness" (which adds onto that).