This article from a few years ago shook up the headphone world. For years, writers like me had argued and argued that amp makers should pay attention to output impedance, but for the most part, our entreaties fell on deaf ears. In forums, impedance preachers were derided as not listening to amps, but listening to spec. Until this dude came along and set things straight.

The headphone world is vastly different now.

God bless you, NwAvGuy.