Retired MD / Technologist. Into audio since the '70s. Current passion good headphones - currently ZMF Blackwood Auteur Classic, Blue Stabilised Maple Burl Verite Closed, DCA Aeon X Closed and Sony WF 1000MX4, RME ADI 2 FS, Linear Tube Audio MZ3, Quicksilver HPA. An ifi hipdac 2 and Qudelix 5K for mobile use. Most of my audio is AAC and some flac / alac.