Skip to content


An IRIS system may involve multiple types of calibration:


IRIS can store multiple documents for each calibration type, so please take care to select the correct one in AUDIO SETTINGS before conducting any measurements.

Import Calibration Data

Calibration data can be imported into IRIS software using the Import Calibration Data window in the Edit menu.

Import Calibration Data

Import TetraMic Calibration

There are two formats of TetraMic calibration documents: an older style, and the current style.

Current TetraMic Calibration Documents

Modern TetraMics (as of ~2020) come with a newer format calibration document. Unlike the older style, this is made up of one file with the extension .tetra. To import, click the + button and locate the .tetra file.


.tetra calibration documents are only supported in IRIS 2.0 and newer.

Older Style TetraMic Calibration Documents

Older style TetraMic calibration document consists of a text file and a folder, both named with the serial number of the TetraMic. The folder contains eight filter files with the extension .iir.

TetraMic Calibration Files

To import the TetraMic calibration data, click the + button and locate the *.txt file.

Import Audio Device Calibration

The audio device calibration document is a single XML file. Ready-made IRIS kits are delivered with an audio device calibration document but you may also perform this calibration too. This is typically named with the serial number of the IRIS kit, e.g. 8018.xml. To import, click the + button and locate the XML file.

Import System Calibration

The system calibration document is an XML file (created by a user). To import, click the + button and locate the file.

Calibration Data Location

Calibration documents are stored in the user’s roaming profile, along with other IRIS settings:

%appdata%\Marshall Day Acoustics\IRIS

For example: C:\Users\username\AppData\Roaming\Marshall Day Acoustics\IRIS

You can open this location from within IRIS by selecting Advanced on the import window and selecting the link.


If you generate you an audio device or system calibration file, this will already be available to the local installation of IRIS. If you wish to copy this to a different PC, locate the corresponding calibration file on the file system and use the import button on the other PC to load this into IRIS.


System calibration files are stored in the folder named Strength Calibration.


If you wish to delete any calibration data, you must do this directly on the file system. Please make sure IRIS is not running when you modify any calibration data on disk.