Could you, please, give some more details about Bluetooth function? Does zx1 support aptx coding?

My headphones also smelled pretty strong when I got them. The swell had gone within a couple of days. I did nothing about that, just left them on my headphone stand.

I do listen to classical with x1 and I think it is quite enjoyable experience. I find no problem with treble, what may be a little artificially sounding with classical is prominent bass - this might be a problem for some listeners (not for me), but is really helpful for enjoying music at low...

I fully agree that x1 is great for low level listening. For me it is a priority. That is why I sold dt880 and decided to keep x1. IMHO x1 is offers overall a better sound quality, especially in the midrange area. The supposedly overblown bass is not an issue when the volume is down, you can hear...

By the way, I have also said good by to my k501, as X1 are also so much more fun to listen to.

I like X1 much more than DT880/600, that is why I decided to keep the former and sold the latter. For my taste, X1 offers more engaging sound, with nicer midrange. :D