You asked about this in ruskymx's thread (discussing retaining the USB socket), but I thought it would be better to answer here...
Quote:
Originally Posted by kndonlee
somewhere I read about the microphone above the light being usable, but it's a 4 wire setup which is supposed to be for an amplified mic. Any resources on converting an amplifed mic setup to a non-amplified 2-wire mic?
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This thread talks about the mic in a 2011 Impreza:
Interface OEM Bluetooth Microphone with Aftermarket HU
Here's another about the 2011 Legacy/Outback mic:
2011 OEM Microphone in Overhead Console
Most aftermarket HUs use 2 wires for the mic. One wire provides DC power to the mic element and also carries the AC audio signal into the HU. The second wire is the ground/shield. It should be possible to use the aftermarket HU's mic power voltage to run the car's mic module (may require a few extra components -- resistors and capacitors).
First, someone needs to open up the mic module in a BRZ or FR-S to see what you're dealing with. There's a chance it could turn out to be a simple electret condenser microphone element (just like what aftermarket HUs have). But I suspect you'll find a module with an amplifier circuit, like in recent Subarus.