​Question

Where can the Calibration File be obtained?

Answer

No individual mic calibration test document is included or available.  The RTA-M microphone is designed to be used with the dbx DriveRack family of products and the AutoEQ Tuning feature on those devices.

Frequency response and product specifications can be found on the product webpage here:

https://dbxpro.com/en-US/products/rta-m