I’m sorry about your Cortado’s sensitivity issues…It is a sensitive piece of equipment. The easiest solution is to use mechanical dampening to reduce the sensor’s ability to detect vibration. Try wrapping it in cloth or high density foam or potting it with hot glue or something to stifle the vibrations that get to the disc.
The MkIII does have a pad, if you are interested in that.
Please don’t confuse “sensitivity” with “head room.” By turning the pot all the way down you are reducing the bias voltage on the FETs causing them to loose a lot of headroom. Reducing the phantom power voltage will only reduce the headroom too…it will still be just as sensitive, but it can’t pick up as large of signals without distorting.
I can’t remember what the frequency response is off the top of my head. The output impedance is a few thousand ohms…I’m sorry, I don’t remember specifics.
-Brach