Transmission Suite

A transmission suite can be considered the opposite of an anechoic chamber because its boundaries reflect, rather than absorb sound energy. Transmission suites are essentially two reverberation rooms back to back and are designed for the determination of sound power output of noise sources, transmission loss of partitions, insertion loss of silencers, response characteristics of microphones and random incidence absorption coefficients of materials. They are also used for high-intensity noise level fatigue testing of aircraft, space vehicles and other equipment.

The purpose of a transmission suite is to create a highly diffused acoustic measurement environment, defined as a sound field in which acoustic energy flows equally in all directions. A transmission suite must provide sound isolation against extraneous noises and an environment which can be temperature, pressure and humidity controlled. IAC Acoustics has installed many field-proven transmission suites in different configurations. With more than 60 years of experience, IAC Acoustics is the pioneer and leading company in the design, construction and commissioning of modular transmission suites.

Construction of Transmission Suites

For a transmission suite to perform correctly, careful consideration must be given to a number of factors which include:

  • Test standard or method
  • Interior volume
  • Room dimensions in relation to test object size
  • Interior working space
  • Lowest frequency band of interest
  • Internal acoustic ambient noise level
  • Noise reduction
  • Vibration isolation
  • Silenced ventilation systems
  • Doors and access
  • Lighting and electrical systems
  • Overall structural requirements

Standard Features

IAC transmission suites come fully equipped with the following features:

  • IAC Hardliner™ acoustic panel construction
  • Double / single wall and ceiling construction
  • IAC ventilation system coupled to building supply
  • Interior lighting and power
  • IAC Noise-lock® acoustic door
  • Complete certification and commissioning tests


  • Self-contained air handling / ventilation system
  • Additional / larger door
  • Access panels for equipment and test openings
  • Air mounts, or other types of vibration isolation
  • Turning vanes and / or diffusers
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