We achieved flight without mimicking birds or bats. Whether I'm conscious and having a subjective experience of being or not is of no consequence to anyone but myself. If I speak and act exactly like someone experiencing a subjective, conscious existence, it's good enough to assume that I'm having that. If a computer behaves exactly like it's conscious, that's good enough. It actually being conscious wouldn't add anything from any human perspective.

I used to own Arya v2, and they were better in most respects. But I still went back to the 6XX for the tonality. Most of my listening is just quiet, background music while I'm on reddit, so it was worth it to sell the Aryas and put that money elsewhere. This is a fantastic combo, and I have my PEQ adjusted perfectly to my tastes. I haven't heard the HD600, but they probably sound about the same when EQ'd. I'm glad you've found what makes you happy. Satisfaction is elusive to too many.

I've got a Cavalli Tube Hybrid with SDAC, and use it with HD6XX headphones. I use PEQ and crossfeed from a Linux app called Easy Effects. I've had this set up for several years, and don't want anything else.