Dude he want Dt990 closed back..
none in your list sound close to that.
Who's the dude?
i need some cans with [...] crisp highs, wide soundstage and very very nice bass)
I have to chime in on my AKG K550 experience:
- fairly balance, but slightly thin
- very little bass authority or impact below 60Hz (driven from near zero impedance, linear, dual-mono discrete class A amp with plenty of power)
- not a lot of sound isolation
- Nowhere the near soundstage (width, depth, location) as my Audiotechnica W5000 or Foster Massdrop THX-00
For me K550 are very problematic due to low camping force, dependency of sound based on head size/shape, not a lot of headband tunability (Beyer headbands can be bent for tighter/loser clamp).
So, YMMV for K550, but it is much more challenging headphone in terms of fit than the circumaural full-size Beyers, imho.
My take from your post is that you do have serious fitting issues. You should try to bend your 550 headband so that you have a tighter grip on your head, and that will likely fix your isolation and 'little bass authority impact below 60hz' issue. The 550 has MAJOR bass authority, moreso than the 990s, that's mostly why I recommended them, also they have quite a large soundstage for closed headphones. Check out even the measurements; the 990 has its severe bass bump at 100-200 hz, the 550 has some bass boost in 100-200hz, but it has a MAJOR bump at 20-60hz, and they basically, IMHO,
destroy open headphones like AKG Q701, B DT990, hifiman 400i, etc., open headphones with its lower bass amount.
https://www.innerfidelity.com/images/AKGK550.pdf
http://www.changstar.com/www.changstar.com/index.php/topic,858.0.html
Its low bass is quite impressive. It's not the most accurate/detailed, both in bass and generally when compared to open & more expensive headphones, but the lower bass boost you get with the 550, plus factoring their very nice sound response / lack of coloration (way better balanced than the 990, imho, even with bass boost they sound quite balanced), the very expansive soundstage for closed headphones, it's a very good package and it's fairly cheap. IMHO, the 990 is quite of a mess sonically, and will often sound downright atrocious because of its FR aberrations: Super bright often makes voices/sounds just super annoying and sound incredibly bad... When the 990s is met with a recording which makes them sound bad, they really sound like absolute offending and unlistenable garbage.
The 550s are better balanced, while still imho meeting the requirements; "crisp highs, wide soundstage and very very nice bass". Well two at least. The treble of the 550 is ok; not bad, not great. It's decent and a little elevated. Really not that much, but kinda. imho it's good enough as to not bother you at all while listening; which is pretty much my main criteria for being good/bad. But it won't offend you or be unlistenable to on any material.
They're just a good closed heapdhone. But they're not the 990. But I'm sure there's many others, likely better headphones out there. Just thought I'd throw them in the pot, if it sounds interesting good, if not disregard!