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.

Please see for detailed documentation, including the software installation procedure.

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 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

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

    Associate Professor Yan Xiang, Tsinghua University
  • 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