I am used to open-back headphones, I noticed that the TH-X00 is semi-closed. Is the different much different from let's say the Beyer DT990?

I got my DT990 for around 2 years now, looking to try something new. I am looking towards getting the HE400i because of the BF discount, but I am also interested in the HD600/650 because I have a HD558 that I liked too. If I am mostly using my headphones for movies, which one would be a better...

Will my headphone sound the same with the modi? Reason why I am looking at the aune is because of the tube option.

Currently using my DT990 600ohm with a Xonar DX + Schiit Magni for amp. I am looking to get rid of the sound card and use an external DAC. Will I see much difference if I go with the Aune T1 Mk2 as both DAC and amp? 

Just purchased the DT990 600 ohm from a local store today. However, the packaging of the headphones looks completely different from what I show on youtube unboxing videos, and on amazon; it did not have a security seal on it either. Can anyone who purchased the DT990 help me out to see if the...

I am currently using a pair of Senn hd558 and Shure 840, and I find myself spending more time with the hd558 as I like the sound from an open headphone. Both are currently connected to the Xonar DX, and planning to upgrade to the Xonar Essence Stx. I have my eyes set on the DT990 600 Ohm and the...