I use the cable without the iDevice remote/microphone.
The plug at the amp side is a TRS where Sleeve is ground. At the Headphone side the resistance between either the Sleeve or Ring nearest the Sleeve to the Sleeve (ground) at the amp side is 1.1 Ohms. The resistance between the Sleeve and Ring nearest the Sleeve at the headphone side is 2.2 Ohms. I am an EE, this is a simple thing to me, I speaketh not b****t
So you measured 2.2Ohm and 1.1Ohm, that would confirm that cable has four inside. So if socket on the headphone was TRRS then making balanced cable should be simpler than that mod. I still wonder why did he have to solder wires instead of just making new cable...
Yep, that's what I measured, yep, four inside the stock cable. I don't understand what you meant exactly by "why did he have to solder wires." Didn't he use a new wire but only 3 conductors? A common ground wire in the cable, not the best thing to do.