Wiring for an Audio-technica headworn mic (ATW-201/H)

[MikeFloutier]

Hi,

I just bought an Audio-technica freeway 200 ATW-201/H Headworn Microphone System.

Problem is that it is missing the 4-pin plug for the Unipak transmitter. That's not really the problem as I'm getting some spare plugs.

The real problem is that (having established the pin assignments for the unipak connector) I find that the lead for the mic has 4 wires plus a shield.

Does anyone have any idea why there are four wires (I was expecting two) and, more importantly, what do I do with them?

Thanks

Mike