Thank you very much for your very detailed answer I'm again with the 9200s (more of that tomorrow in it's thread ) and right now listening to "Therion - Crowning of Atlantis". My favourite Therion song is "Clavicula Nox" (the original and the one included in this album) and I love how the 9200s manages it's bass but just want a little more impact, just a little... Now listening to "Thor The Powerhead - Manowar cover" from the same album and it's incredible how clean is the bass and the sub-bass and I don't find it thin at all. I referred to the 9200s because someone said in this thread, when trying the Rögnir, that the bass is a little thinner comparing to the 9200s bass. I think that also our friend @Malevolent commented something similar when he tried the Rögnir.
Anyway, I'm burn-ing again my 9200s... So maybe the bass will improve...
I've just found this Clavicula Nox version and I'm loving it:
Cheers, I just listened to the Manowar cover. As I've mentioned before, I'm a longstanding Manowar fan so this perked my interest. I like the cover. It's meaty and fat/phat. Sounds very good on the Rognir, the tom tom drums on the pre-chorus are especially majestic. Check out Arch Enemy's cover of "Kill With Power" for a similar test. And also Fear Factory's cover of "Cars." The Rognir conveys the bass on this track very well. Comparing with my TH900, which is beside me, there's a little more snap on the sub-bass region, but every other region is impoverished next to the Rognir (off-topic, but I've come to the conclusion that the TH900 really aren't great for metal). On the ZMF VC - again with FF's cover of "Cars" - probably the best of both worlds in some sense; the low end is meaty and substantial though much softer than the Rognir.
Sadly, I've never tried the 9200, though of course as you say @Malevolent knows it inside out. It's on my list I would say, though, the Rognir take some time to get used to and likewise returning to another headphones takes a moment of adjustment. There is a clarity to the Rognir that might sound lacking compared to super lush/warm headphones, but this is misleading, I think, once you settle in.