[rodgerd]

Commercial systems that do this kind of room correction generally have a limited range of recommended microphones, and the more expensive (and hopefully better) ones will have the microphone calibrated and factored into the room correction - for example, Anthem's Room Correction (ARC) ships mics that have a serial number. You plug that into the ARC software, it looks up the factory profile of that specific mic, as it was recorded at build time, and weights the calibration for it.