I got a set of DT-1770's in last week and have had a full day of music on them. So some bullet points on my opinion of the cans.
-Put 12 hours of pink noise through them before the eval
-Tidal loss-less as source
-My other headphones for reference are the Oppo PM-3 and LCD-X
-Velour pads were used
-Used an OPPO HA-1, HA-2 and Schiit Modi/Vali for amplification
-Paired very well with the Schiit and HA-2. Just ok with the HA-1
-Slight V Signature
-These cans are awesome with Rock/Metal/Electronic and good with more acoustical/vocal music.
-Base response is impressive in punchiness and clarity.
-Close to the LCD-X in bass punchiness but does not extend as far as the LCD-X's
-DT-1770's have better extension in the bass and treble than the PM-3's
-A little funner than the PM-3's
- Not as compact as my PM-3's. I carry the PM-3s in my backpack. DT-1770 are too big for that.
-As for closed can, they have a decent sound stage.
-Detachable cables works well and very much appreciated.
-Cables are better than the norm for being factory supplied. I feel no need to upgrade the cables.
-Case works well to store cables and headphone.
-I find them comfortable with the valor pads. They did initial clamp a bit tight. I just stretch them a little to relive that. No problems with a 4+ hour session.
Overall, I am very happy with the performance of these closed back cans and think they are worth the asking price. These are the best sounding Beyerdynamic headphones I have herd.(compared to the DT990 Pro 250, T1 v1) IMHO. I do not think they punch above their price point, but right at it. I will post some pictures up tonight.