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IRIS 2.0 Docs


IRIS is a room acoustics measurement system developed by Marshall Day Acoustics in New Zealand. It was released at the beginning of 2014 as a fully integrated hardware and software system for making 3D impulse response measurements.

It is now available with or without a hardware kit, and the software comes in various forms depending on your requirements.


If this is your first time making measurements with IRIS, please start here


Click here if you are looking for IRIS 1.4 docs.


  • 3D impulse response measurements visualised in an intuitive way which enables you to link the perception of sound to the architectural form of the space being tested.

  • Measurements of room acoustic parameters according to ISO 3382-1:20091 and ISO 3382-2:20082

  • Sound strength calibration and measurement (with both 3D or mono microphones)

  • Lateral fraction measurement when using a 3D microphone array

  • Speech Transmission Index measurements according to IEC 60268-16:20113

  • Open plan office measurements according to ISO 3382-3:20124

  • Automatic source-receiver distance calculation

  • Import and export the impulse response data in various formats

  1. International Standard ISO 3382-1 Ed. 1, Acoustics – Measurement of room acoustic parameters – Part 1: Performance spaces (2009). 

  2. International Standard ISO 3382-2 Ed. 1, Acoustics – Measurement of room acoustic parameters – Part 2: Reverberation time in ordinary rooms (2008). 

  3. International Standard IEC 60268-16 Ed. 4.0, Sound system equipment - Part 16: Objective rating of speech Intelligibility by speech transmission index (2011). 

  4. International Standard ISO 3382-3 Ed. 1, Acoustics – Measurement of room acoustic parameters – Part 3: Open plan offices (2012).