Ahh, I totally forgot about those contacts! Silly me. Sometimes when you are a hammer, you see everything is a nail lol.There will be a set of contacts on the 3.5mm jack socket. (Just like the contacts on the headphone socket of a radio that disconnect the internal speaker when the headphones are plugged in.) It is possible that they could detect the resistance of the headphones. If you plug in a 3.5mm jack plug with nothing connected to it that will tell you which method is used.
Les.
by Duane Benson
by Jake Hertz
by Jake Hertz
by Jake Hertz