What is the impedance of audio output in cell phone. I mean 3.5 jack for headphones. Is that somehow standardized? Do we know ranges among cellphones? Or mp3 players. I haven't found any information about impedance, when searching manuals for cellphones or mp3 players.
Does anyone have experiences, how non-matching impedance of audio output and headphones impact the quality of sound?
I'm trying to find perfect headphones for Sony Experia L.