Headphone Inventory

Etymotic HF3 (isolation)
HIFIMAN Re800 (situational awareness)
Apple AirPods (wireless)

Past Owned... many others auditioned:
Sennheiser HD800
Stax SR-009
Stax SR-007 Mk1
Stax SR-001
Plantronics Backbeat Fit (gym, running, situational awareness needed)
Sennheiser PMX 685i (gym, running, situational awareness needed)
MrSpeaker Mad Dog
Etymotic EP4
Koss ESP-950
Grado HP-1
Sennheiser HD580
Stax SR-Lambda Signature
Stax SR-5
AKG 240 (from the 1970s)

Headphone Amp Inventory

See Sources

Past Owned (or extended loan... thanks Paul, Andy). Many others auditioned:
Headamp GS-X mk2
Schilt Ragnarok
Headamp Pico Power
Headamp Blue Hawaii
KGSSHV
Headamp GS-1
Gilmore Lite
Headroom Max
Grado RA1
Stax SRM-T1W
NAD 3020 to drive Stax energizer and it's headphone jack

Source Inventory

iPhone and Macintoshes feeding mostly Apple Loseless to:
EarStudio ES100

Past Owned... many others auditioned:
Chord Mojo
Schilt Yggdrasil
Schilt Gungnir
Lavry DA-11
CEntrance HiFi M8
Geek Out V2
Dragonfly-1.2
Chord Hugo
AQ DragonFly
CEntrance DACport
Fostex HP-P1
HRT Streamer II+
Squeezebox
various CD players
various turntables and cartridges

Cable Inventory

anything of sufficient gauge, mostly monoprice

Other Audio Equipment

KEF LS50 Wireless Monitors
Previously Classe | Chord > electrostatic speakers

Audio-Related Tweaks

Roon

Music Preferences

Focus on jazz, singer/song writers, but pretty much everything but country/western (western part), gangster rap, and bad pop.

Gear-Fi

Cervelo R3, Zojirushi double walled mug, Garmin 955

Occupation

Engineering Director, typically focus on DevSecOps