If you are using the Sonarworks XREF 20 measurement microphone, you can enter the Microphone ID (written on the microphone) in the Measure software. This will load your unique microphone calibration file from our servers.
All Sonarworks XREF 20 microphone calibration files are also available on our downloads page. We provide calibration data for 0° on-axis and 30° off-axis. Use the 30° calibration file with Reference 4.