New Release - IRIS 1.4

31 July 2019
New Release - IRIS 1.4

We are thrilled to announce the release of IRIS version 1.4.

The new version includes several new capabilities and optional extras. Key features include:

  • Speech Transmission Index (STI) measurements
  • Automatic source-receiver distance measurements using a loopback connection
  • ISO 3382-2 parameters (linearity of decay curves)
  • Enhanced support for mono measurements, including the ability of perform a ‘System Calibration’ for measuring sound strength
  • Export both single and 1/3 octave band parameters in spreadsheet format

IRIS 1.4 is a free update to all existing IRIS customers. If you are an existing IRIS user and haven’t received the update yet, please contact your distributor or


What people are saying

  • The operation and configuration of IRIS is effortless...

    Sebastià V. Amengual Garí
  • The success of a musical performance depends on the sense of proximity of performer to listener. This sense is mediated largely by the directional properties of the reflected sound field.

    Sir Harold Marshall
  • I regard the acoustic designs of Marshall Day Acoustics to be amongst the finest and probably the most innovative in the world.

    Dr Anders Gade, Technical University of Denmark