Electret condenser: what is the point of this circuit and how to wire it to a TRS jack
The datasheet calls it a &quot;GSM buzz-blocking capacitors&quot;
Normally one is sufficient, but they must have found 2 parts work better in their layout.
Microwave has a nasty wave of inducing rectified carrier into audio systems. Cell phone pings and GSM are notorious for this. So this simply shunts these little signals above 10 MHz so the FET does not rectify it.

I plotted the FET drain R and shunt caps here. The intersection is where the signal &quot;rolls off&quot;.(attenuates)