I just ordered the stuff for my mod
http://i.imgur.com/UqVLklw.png
(heatshrink is just because it's cheap and idk what I'll need)
I will attach mic to my headphone grill (ATH-AD700) and have the wire running down to the hole where the cable currently comes out of, which I will replace with the TRRS panel mount. Then I will make a cable: 1 male TRRS on 1 end, and 2 male TRS on the other end for mic+headphones (I realized this is cheaper than making/buying a cable+adapter; 3 connectors instead of 5) I believe if I make it correctly I can just use one of my plentiful TRS cables for audio only if I want to take them on the go.
I still want someone to confirm -
I can use the same ground wire for the mic and the headphones?
16 or 18 awg speaker wire for the cable wont be a problem, other than possibly uncomfortability due to weight?
I made a "prototype" version with my brother's headphones (thrashed to hell and back JVC RX700), just using plain speaker wire all the way to the connector which I got from a broken pair of ear buds. If anyone is wondering, the mic is from a broken Plantronics headset (garbage headphones anyways, but good mic) It was really simple to attach, I just took apart the headset and threw away everything except the mic and the screw that attached it, then made a hole in the plate of the headphones for the screw and another for the wires (I used my soldering iron, but I would recommend a drill
). Then I soldered the mic wires to the speaker wire, made another hole for the wires to come out of, tied a knot on the inside to keep it secure, and soldered the other end to the headphone connector. I should have taken a pic of the inside, but its too much work to open them up now.