The cymbal hits on Know What I Know are splashy on the recording for sure, and sound that way on my HD800s and HF-2s that I'm playing with here. But, I'm not hearing any painful sibilance on either pair. I have to say though, before they were run in, I reckon it would have been a different story. My HD800s did have a rather nasty top end out of the box, which has (thank goodness!) calmed down significantly over a few weeks of heavy use. Probably teaching you to suck eggs here, but I presume your pair have a good few hundred hours on them...?
No doubt, even after run in, I find the HD800s fairly unattractive on really poor recordings. For those, I tend to reach for less revealing/accurate cans (Grado & Alessandro in my case). But...do try out a really good recording of some kind through yours. From my experience with them, they are capable of great things with a great source. Everyone on this forum has some Diana Krall stuff lying around...don't they..?
No doubt, even after run in, I find the HD800s fairly unattractive on really poor recordings. For those, I tend to reach for less revealing/accurate cans (Grado & Alessandro in my case). But...do try out a really good recording of some kind through yours. From my experience with them, they are capable of great things with a great source. Everyone on this forum has some Diana Krall stuff lying around...don't they..?