I have characterized our pursuit as a "hobby" for a long time. I don't think it's fundamentally different than someone who plays Magic the Gathering, collects autotomotons, sings in a community choir, or restores vintage automobiles.
For those of us who still listen to physical media our hobby has 2 dimensions. We collect and curate our equipment but more importantly we collect and curate our music. I can get goosebumps from listening to one of my favorite tracks on a boom box. But to hear the dynamics, frequency range, and imaging realism on my system is thrilling. Sort of like driving a really fast sports car around the track. Hobby is the best word I can use to describe what I'm doing.