I started with the Takstar Pro80 as my first dip into high-grade audio in 2015, and it's been a downward slope from there. V-Moda's M-100 was next, followed by the Crossfade 2 Wireless, and now the DSR9BT. I'm currently testing the HE-400S, and I'm probably not going to stop there (planning on acquiring a Beyerdynamic DT 1990 + Schiit Jotunheim next).