Scenario: 3.5mm TRS audio connector on a pair of Panasonic RP-HC200 Noise Cancelling headpohones is damaged, so I cut it off and I'm going to replace the connector from another pair. After cutting and opening the jacket, I find 5 wires (Red, Gold, Blue, Green, and blue/gold-stripe, as per attached photo). I was expecting a standard 4: one pair for each driver. What is that fifth wire for? Where would I hook it up?
Now, as I understand, "noise cancelling" is usually done with a tiny microphone on the outside of the headphones to sample the environmental sound to produce a "negating" sound via circuitry embedded in the headphones' "cans", but I would have expected all of that to remain inside the headphones, no need to send the signal down the cable. And moreover, since its still TRS (not TRRS), I don't see where it would be hooked up.