It seems like I made premature judgement on the TH900. The TH900 needs strong amping I realized. If the amping is not sufficient, the bass won't show itself as much it has potential to do so. You can get lots of bass out of it if the amp is right. I find that tube amps are the ones to do the deed. Eddie Current Zana Deux Super drives these superbly, and feel like it's the right match. It seems delta sigma DACs are better suited as well.
I'm most impressed with the spacious-ness of it's sound. Probably the biggest closed-back sound stage I've ever heard. I'm not so impressed with the resolution though. I can't see it being more resolving than the HD6 series sennheisers. The imaging however for a closed-back is quite impressive. If the right source and amping is used, you can get some good airiness for closed back, which makes the imaging so special on these. The bass on these are different from D9200. D9200 has small pad opening just to fit the ears, but these have a large size, which I believe causes large size bass compared to more focused, tighter D9200 bass. I believe, it needs more air moved for the bass to feel significant, and thus need full-sized amping, not portable. Unlike D9200 which works fine using portable devices.
It's hard to say if D9200 is really better, but I think I prefer the D9200. I wish the TH900 didn't have the 6k peak, it causes too much sibilence to certain tracks.
If I were to make a better headphone either of the two, it would be the focus sounding of D9200 without the 6k peak of TH900, with the sound stage and imaging of the TH900. And the build quality of D9200. D9200 just seems to have more updated build quality. It would be the best of both worlds.
