*† A method for characterizing non-condenser microphone frequency response up through at least 100 kHz has been developed and validated. This method exposes a device under test microphone and a reference microphone to the same acoustic field. A frequency response function between the two devices is then determined through a sequence of measurements and calculations. After accounting for the known response of the reference device, a frequency response for the device under test is generated. This method for characterizing microphone frequency response will be presented along with results obtained from applying the method to a microelectromechanical systems microphone.