I've been trying to find my answer to this and whilst there has been some mention of it, I can't seem to find the definitive answer.
I have the Denon AH-D5000 and use them with the Fiio E7/E9 Combo. The question is should I be plugging them into the 3.5mm jack or the 6.35mm jack? I don't quite understand the whole output impedance issue.
Any advice would be much appreciated.