And what precisely are these flaws corrected by pro 2900 in your opinion ?
They're faster, have tighter bass, better soundstaging (which I attribute to the improvement on S-LOGIC Plus), and aren't "muddy" or "slow" with complex passages.
I'm trying to look at this from a totally objective viewpoint. I actually like the Ultrasones much better than the DT990. However, I say that they are equal based on technical details like separation. I know that a totally objective viewpoint is impossible, but what I'm just trying to get at is that the PRO 2900 is overpriced based on it's technical abilities, when compared to other headphones.
And my point is that your assessment of technical abilities here is subjective (which isn't a four-letter word; in the audio community I've noticed a huge naturalist/scientism thrust that seems to feel that rejection of subjective/qualitative data is somehow rational - I think that by and large there is a massive misunderstanding of subjective/objective, qualitative/quantitative, deductive/inductive, and how all of these relate to empiricism) - not based on measurement or similar. And even if it were, there's no empirically established preference data for headphones. Technically I think they're beyond most other cans, but not by a whole lot. Really that ~$600 bar is where you start seeing no real performance returns, and there's a lot of good headphones around $200-$300. For example the K701 or HFI-2400 - they're "nearly as good" as the PRO2900, but they don't give you that last inch. You pay about double for that. Honestly I think the HFI-2400 are an example of "very good" and the PRO2900 are "slightly better" - but again, you pay double for that improvement. Expecting them to double this intangible "performance" value over the HFI-2400 or K701 or whatever else is kind of nutty, but I understand where the belief comes from.
I'll add to this that headphones at $1000 or better compared to the PRO2900, as rawdawg pointed out, don't really get you a whole lot (if anything) beyond more luxury or exoticism. Preference aside (so some people may dislike the sound signature of the PRO2900 but find the similarly priced MDR-SA5000 more appealing; neither are technically incompetent though (honestly you get beyond that starting at that $200-$300 bar, in *most* cases)).
In short, I think we're on the same page!
In the realm of headphones, I don't think anything else is possible, sadly. Everything is opinion and there is no quantitative ranking; machines can't measure how good a headphone sounds. We just go by what other people say.
Not necessarily. There are measurable, observable, and repeatable facts in most anything - even things that involve human subjects. There just aren't a lot of them established in audio, because there's so many conflicting interests and political/economic agendas at work. Very few people just go out and "find truth" for the sake of doing it - there's almost always some sort of profit or political motive behind it. The lack of empirically established preference data is a big issue when it comes to measurements though. So while we can go out and look at measurements that compare the PRO2900 and DT990 (GoldenEars has both in their measurement book), there's nothing that says out-right "well this feature is good and this feature is bad." That data just doesn't exist (but that doesn't mean it cannot exist; Ultrasone has actually done some of the preliminary research in that area already, but for whatever reason they seem to have stopped recently).
They must have heard you macro, because the PRO2900s are on Amazon right now for $399...lol...Don't know what they usually go for though....Only one left atm...
They've been up for $399 from Amazing Deals Online (the FBA you're seeing on Amazon) for a few weeks now. List is $599 (at least at launch it was), but Ultrasone doesn't even sell them direct for that much (they're regularly $499-$549; $449 is not uncommon though). Which seems fairly typical for Ultrasone - they run around half to three-quarters of MSRP; just like the HFI-2400 which are regularly $180-$220, but list is around $350. If only they let the Signature and Edition lines behave in the same manner.