Real Ear Attenuation at Threshold (REAT) Systems for Hearing Protector Testing


VIacoustics Real Ear Attenuation at Threshold (REAT) audiometric measurement systems test in accordance with standard test methods* on earplugs, earmuffs and other hearing protection devices and systems. The REATPro software, when used in conjunction with our Trident software, also supports many other measurements commonly conducted in hearing protector test laboratories, including MIRE and fixture based testing of hearing protectors. REATPro is an automatic Bekesey audiometer program designed to provide stimulus and track responses for sound field hearing threshold determination for both occluded and unoccluded conditions. REATPro also provides calibrated signal generation for all tests including MIRE and fixture based tests.


  • Tracks both unoccluded and occluded hearing thresholds
  • Provides both thresholds and trace history
  • Provides tools for sound field calibration
  • Automated attenuator control and gain adjustment
  • Data export into MSExcel for post-process analysis and reporting

Contact us about building a Real Ear Attenuation at Threshold system featuring our REATPro Software for your audiometric testing lab. Browse through the components that make up these systems, features of the REATPro software, and services provided on the following tabs.

*Standardized test methods:

Code of Federal Regulations (CFR) 40, Part 211, Subpart B – Hearing Protective Devices

ISO 4869-1:2018 Acoustics — Hearing protectors — Part 1: Subjective method for the measurement of sound attenuation

ISO 4869-3:2007 Acoustics — Hearing protectors — Part 3: Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture

ISO/TS 4869-5:2006 Acoustics — Hearing protectors — Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects

ANSI S12.6 – Methods for Measuring the Real-Ear Attenuation of Hearing Protector

ANSI S3.19 – Method for Measurement of Real-Ear Protection of Hearing Protectors and Physical Attenuation Ear Muffs

Australian/New Zealand Standard 1270:2002, Acoustics – Hearing Protectors


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