entry-level headphones are the right way to have momentum, and watch Feiao FD1 give you a "beryllium"-FIIO---BORN FOR MUSIC
Master & Dynamic MW50+ Bluetooth 2-in-1 Wireless Headphones with 40 mm Beryllium Driver for High Sound, Converts from On-Ear Headphones to Over-Ear Headphones, Black/Black: Amazon.co.uk: Electronics & Photo
Periodic Audio Be in-ear-headphone review: These beryllium-based headphones sound oh so sweet | TechHive
Focal Utopia Headphones in Open Back Hi-Fi Headphones at Audio Affair
Know Your Sound Tool: Beryllium Drivers | Master & Dynamic
KLH Ultimate One Headphones, 50mm Pure Beryllium Drivers, Zebrawood - Creative Audio