Theres def some production variation going on. I just ordered another 2C because I was curious and my newer 2C is more resolving, has a hint of lush ness to it's mids but as overall much more punch, life to the sound. The difference is enough to the point I now love my new 2C. I hate the cherry picking of the Audeze phones but if you get a good one you're lucky. It makes me wanna try another LCD-4 Haha.