Try IRIS now

Click below to download a free trial version of the IRIS software (v1.1.1) and an example project. This version is a viewer - existing projects can be opened and analysed, but new measurements cannot be conducted.

Run setup.exe to install. IRIS requires Windows 7 or newer. If you require support please email


The IRIS kit (software and hardware, not including a source loudspeaker) is available now. Contact your local distributor for pricing including local taxes and shipping.


IRIS User Manual

IRIS brochure


HASP USB protection dongle

MOTU 4pre audio interface

Technical papers

Protheroe D., Day C. "Validation of lateral fraction results in room acoustic measurements," Proceedings of Inter-noise, 2014.

Dunn M., Protheroe D. "Visualization of early reflections in control rooms," Proceedings of 137th AES Convention, 2014.

Protheroe D., Guillemin B. "3D impulse response measurements of spaces using an inexpensive microphone array," Proceedings of ISRA, 2013.

What people are saying

  • Marshall Day Software is like having an acoustic laboratory in the palm of your hand.

    Associate Professor Yan Xiang, Tsinghua University
  • 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
  • The operation and configuration of IRIS is effortless...

    Sebastià V. Amengual Garí