Wow. I'm completely floored at how deep this person got into the world of phones. I was also obsessed with phones for a while, and consider my ears my favored i

Wow. I'm completely floored at how deep this person got into the world of phones. I was also obsessed with phones for a while, and consider my ears my favored input channel, but I didn't take 10 steps to this guy's marathon. Memorizing tons of specific rings and dialtones, recognizing weird audio quirks of specific switches, etc. This is amazing. No matter what you study, there always seems to be as much detail as you have the time and energy to appreciate.