I just received my Beyerdynamic DT990/600 Ohm headphones and have it paired with the Fiio E17. It sounds really good but I was wondering if it was worth the upgrade to a tube amp <$200. My budget is really tight at the moment. I would like a WA3 or MKIV but not happening at the moment. Also, I noticed some people are posting pictures of their DT990/600 boxes and it's black while mine is white. Any way to verify I have the correct/latest version of the DT990/600s?
Thanks in advance.